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EXPLANATION OF THE PLATES.

VOLUME I.

PLATE I. INFUso RI Es.

Page Fig. 1. a. Enchelis Pupa . . . . . . . . . . . . . . . . . . . . . . r b. Alimentary canal and stomach .......... } 153 2. Bosphora Naias . . . . . . . . . . . . . . . . . . . . . . . . . . 156 3. a. b. c. d. Rotifera vulgaris . . . . . . . . . . . . . . . . 153 4. Bacillaria multipunctata . . . . . . . . . . . . . . . . . . 350 5. Cleopatra . . . . . . . . . . . . . . . . . . . . . . 350 6. Discocephalus Rotator . . . . . . . . . . . . . . . . 349, ii. 97 PLATE I. B. INFUso RI Es. Fig. 1. Vorticella cothurnata . . . . . . . . . . . . . . . . . . ... 350 2. a. b. Zoobotryon pellucidum. . . . . . . . . . . . . . . . 351 WoRMs. . Botryocephalus bicolor . . . . . . . . . . . . . . . . . . . . .327 4. Diplozoon paradorum . . . . . . . . . . . . . . . . . . . . 357 a. Ditto, natural size. b. b. Mouths and oral suckers. c. c. Caudal plates and suckers. 5. Diplostomum volvens . . . . . . . . . . . . . . . . . . . . . . 330 6. Eye of a perch infested by Diplostoma. PLATE II. Poly PEs. FIG. I. Madrepora muricata . . . . . . . . . . . . . . . . . . . . . . 180 2. Sertularia volubilis . . . . . - - - - - - - - - - - - - - - - - 169

a. a. Ovaries.

Fig. 3. Cellaria cirrata
4. a. Fungia patellaris, under side.
b. Ditto, upper side.

PLATE III. RADIA RIEs.

Fig. 1. Cephea mosaica a. a. Arms of ditto. 2. Echinus esculentus, portion of the shell Y shown externally. a. a. a. Groves. b. b. Alleys. c. c. The lateral groves. d. The intermediate one. 3. Inside of the same shell. a. a. The dentated suture. b. The middle ridge marked out on each side into transverse pieces. c. c. The alleys, with pores for the suckers. d. One of the frames to which the jaws are fixed. 4. Spines of Echinus cidaris.

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a. Muscular fibres inserted in the base of
the spine, and surrounding the ball and
socket joint.
b. The muscular capsule laid open, and the
muscles attached to the base of the spine
turned back.
c. The origins of the muscles surrounding
the ball or tubercle.
d. One of the tubercles.
. One of the suckers of E. esculentus.
a. The sucker; the pore in the centre is
supposed to be a spiracle connected
with the respiration of the animal.
b. The stalk of the sucker.
6. The suture of a portion of the alleys at the

lateral grove, in which the transverse pieces are convex.

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FIG. l.
. Portion of ditto, exhibiting the suckers on the

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. A circular space round the mouth, co

. A little bristle, terminating in a knob with

. Another Pedicellaria 2 expanded like a

. One of the spines of Echinus esculentus. J

The suture of a portion of the lateral grove Y
uniting with the above, in which the trans-
verse pieces are concave.

Suture of the intermediate grove divided at
the ridge (Fig. 3. b.). Teeth obtusan-
gular.

vered with little oblong scales. In the
centre is the mouth with its five converg-
ing teeth.
Outside of one of the five pyramidal jaws,
in which the teeth are planted.
a. The jaw. b. The tooth.
Inside of ditto: a. the jaw, consisting in-
ternally of two triangular transversely
furrowed, and probably molary plates.

three awns, planted amongst the spines
on the shell, and, according to Cuvier,"

a species of Polype (Pedicellaria).

tripetalous blossom.

PLATE III. B. CRINo.1 DEANs.

Pentacrinus Asteria . . . . . . . . . . . . . . . . vol. ii.

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. Cinthia Momus ... . . . . . . - - - - - - - - - - - - - - - - -
. Salpa cyanogastra . . . . . . . . . . . . . . . . . . . . . . . .
. Pyrysoma giganteum . . . . . . . . . . . . . . . . . . . . . .
. Cephalitis Bowdichii . . . . . . . . . . . . . . . . . . . . . .

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13

12

Clavellina borealis. . . . . - - - - - - - - - - - - - - - - -

* Regn. An. iii. 297.

230 223 227 222 230

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