Billeder på siden
PDF
ePub
[blocks in formation]

PLATE I. B. INFUSORIES. Fig. 1. Vorticella cothurnata

2. a. b. Zoobotryon pellucidum...

350 351

327 357

Worms.
3. Botryocephalus bicolor
4. Diplozoon paradoxum

a. Ditto, natural size.
b. b. Mouths and oral suckers.

c. c. Caudal plates and suckers.
5. Diplostomum volvens ..
6. Eye of a perch infested by Diplostoma.

330 EXPLANATION OF THE PLATES.

PLATE II. POLYPES. Fig. 1. Madrepora muricata ..

2. Sertularia volubilis

a. a. Ovaries.

180 169

xiii

Page 169

Fig. 3. Cellaria cirrata ...

4. a. Fungia patellaris, under side.
6.

Ditto,

upper side.

PLATE III. RADIARIES. Fig. 1. Cephea mosaica

197
a. a. Arms of ditto.
2. Echinus esculentus, portion of the shell

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.
a. Muscular fibres inserted in the base of

the spine, and surrounding the ball and 203—210

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.
5. 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.

a

Paco

Fig. 7. The suture of a portion of the lateral grove

uniting with the above, in which the trans

verse pieces are concave.
8. Suture of the intermediate grove divided at

the ridge (Fig. 3. b.). Teeth obtusan

gular.
9. A circular space round the mouth, co-

vered with little oblong scales. In the
centre is the mouth with its five converg-

ing teeth.
10. Outside of one of the five pyramidal jaws,

in which the teeth are planted.

a. The jaw. b. The tooth.
11. Inside of ditto : a. the jaw, consisting in-

ternally of two triangular transversely

furrowed, and probably molary plates.
12. A little bristle, terminating in a knob with

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

a species of Polype (Pedicellaria).
13. Another Pedicellaria? expanded like a

tripetalous blossom.
14. One of the spines of Echinus esculentus.

-208-211

[blocks in formation]

13

Fig. 1. Pentacrinus Asteria

vol. ii. 2. Portion of ditto, exhibiting the suckers on the

under side of the fingers ..

12

PLATE IV. TUNICARIES.

Fig. 1. Cinthia Momus

2. Salpa cyanogastra ..
3. Pyrysoma giganteum .
4. Cephalitis Bowdichii ..
5. Clavellina borealis...

230 223 227 222 230

| Regn. An. iii. 297.

« ForrigeFortsæt »