b 
} 
MOLLUSCA AND SHELLS. 
16 
PLATE 49. 
1N ral vi ye animal; 
Fig. 593. SEPIOTEUTHIS ARCTIPINNIS, ventral view of the ¢ al; 
593 6, a cupule, from above ; 
593 a, superior view of the head; 
593 c, cupule, in profile.—p. 479. 
Fig. 594. OMMASTREPHES INSIGNIS, ventr 
594 b, the mouth, and cirele of arms ; 
‘arious sizes and forms 
Pp: 
al view of the animal ; 
594 a, the dorsal shaft ; 
594 c, d, e, f, views of the jaws; 594 g—m, V 
igin of the fin, from above. 
of cupules; 594”, shows the or 
480. 
PLATE 50. 
Fig. 595. ONYCHOTEUTHIS RUTILUS, dorsal, and 6954, xa! 
views of the animal; 595, mouth, and cirele of arms; 599, 
cupule, from above; 595 d, ranges of cupules; 595, hook cap- 
sules of the tentacular arms.—p. 482. 
Fig. 596. ONYCHOTEUTHIS BREVIMANUS, dorsal view of the ani- 
mal.—p. 483. 
PEATE. Si: 
Fig. £97, ATLANTA primiTIA, shell and animal, magnified; 597 a, 
the head and proboscis, much magnified ; 597 6, natural size; 597 e, 
thoracic tube and sac; 597 @, section of the shell. 
Deraus. a. The eye, a transparent globe, resting on a dark 
base. b. Bag and tube, hanging free externally. c¢. Mouth, the 
tube below enlarging into a stomach. d. Intestine. e. Ovate 
organ, probably the heart, beating regularly when the head is ex- | 
serted, but not observed in action when the head is retracted. 
f. Lamella, facing the beak. g. Two small plates on the lateral 
lamella, h. i. Fleshy antenne. k. Tube, connected with the 
bag b, having vibratile cilix: at the aperture. 
Fig. 598. ATLANTA CUNICULA, the animal and shell, magnified ; 
598 a, the head, still more enlarged ; 598 6, the cervical ganglion 
and its branches; 598 e, natural size. 
Deraits. a. Cephalic ganglion. b. Otolithes (?). e. Alimentary 
eanal. d. Abdominal nerve. e. Nerve to the thoracie ganglion. 
Fig. 599. ATLANTA VIOLACEA, lateral, and 599 a, superior views 
of the shell, enlarged; 599 6, natural size. 
Fig. 600. ATLANTA TESSELLATA, lateral, and 600 a, dorsal views 
of the shell, enlarged ; 600 6, natural size. 
Fig. 601. Limactna (?) cucuLnLata, right, 601 a, left views of 
the shell; 601 4, view of the shell, with the animal. 
Fig, 602. Limacina scApnoipeA, lateral, and 602 a, longitudinal 
views of the shell and animal, magnified ; 602 6, natural size. 
Fig. 603. HyALma remorata, shell, with the animal, expanded. 
Fig. 604. HyaALama INeRMIS, shell, with the animal; 604 a, ven- 
tral, and 604 8, lateral views of the shell. | 
Fig. 605. Cieopora Exacura, shell and animal, enlarged; 605 a, 
transverse section of the shell; 605 6, natural size. 
Fig. 606. CLEoporA PLAcipA, front view of the shell and animal, 
enlarged ; 606 a, natural size. 
; Te ad Ba Ep Re che : ; : 
Fig. 607. CLeopora MuNDA, front view of the animal and shell, 
enlarged ; 607 a, lateral view of the same; 607 }, natural size. 
- \ 7 \D y) | 1 ra — . 
Fig. 608. Ciropora FALCATA, shell, with the animal, enlarged ; 
608 a, natural size. 
PLATE 62. 
Fig. 609, CynruiaA AMpuorRa. 
Fig. 610. PHALLUSIA VIOLACEA. 
Fig. 611. AScIDIA MONSTRANS, several figures, in various atti- 
tudes. 
Fie. 612. BoLTENIA COACTA, lateral view. 
Fig. 613. AscipIAN, attached to coral from Balabac Passage, 
Sooloo Sea; 613 a, an individual, magnified. (J. D. Dana.) 
Fig. 614. BorryLorp, of a fleshy texture, from Feejee Islands ; 
soft, fleshy, eight points to stars ; stars are openings, but open only 
half the diameter of the star ; the openings appear large, but they 
are mostly covered by a very thin membrane; tentacles on sides 
of mass. Animal eontracts immediately when approached within 
a few inches. 
The stellar openings are mouths of distinct animals, each hay- 
ing its oesophagus and stomach ; oesophagus has transverse folds 
(light-yellow color) in membrane; folds are not continuous in the 
tube, but are interrupted in two lines traversing the tube longitu- 
dinally, and are also partially flexed in two other bisecting lines ; 
observed two large, deep-yellow masses, which appear to indicate 
distinet lobes to the cavity; the stomach is attached below to the 
inferior or basal membrane of the mass, the whole alimentary 
canal being nearly or quite vertical; no stomach, as far as could 
be-seen, to the large general mouth; 614 a, detached portion; 
614 d, cesophagus and stomach to the stellar mouths. A structure 
of this nature, seen in mouth and cesophagus, appears to be double; 
forming the cesophagus-tube, or attached to its inner surface ; 
614 ¢, natural size. (J. D. Dana.) 
Fig. 615. Evcmium EruBESCcENS, G., of a spongy texture, at- 
tached to coral from Sooloo Sea. (J. D. Dana.) 
, from coral reef, Balabac Passage, 
Fig. 616. Eucanium 
Sooloo Sea; 616 a, enlarged view. (J. D. Dana.) 
Fig. 617. Euca.ium , from Feejee Islands; surface mi- 
nutely papillose; spongy substance contracts and closes the mouths 
and star openings when irritated; 617 a, natural size. (J. D. 
Dana.) 
Fig. 618. Evcatium .ivivum, G., from Feejee Islands; mass 
without regular form; two or three mouths in the mass; numer- 
ous stellate openings; six-pointed stars; these openings the ex- 
tremities of tubes, which may be traced into the mass nearly to 
texture of frond spongy and tough; the stellar openings 
contract when frond is irritated, but the large mouths still remain 
open even when needle ran into it; 618a, enlarged drawing, 
showing the large mouth and some of the stellate openings at the 
extremity of the internal tubes; 618 6, the frond being torn in 
two, showed the exterior of the internal vessels connected with 
the stellar openings ; the upper banded portion is the cesophagus 5 
there are ten or eleven yellow bands; the lower portion is the 
stomach, and is deep yellow. (J. D. Dana.) 
Fig. 619. Dracoma (2) 
ands; 619 a, one of the small mouths 
, soft and fleshy, from Feejee Isl- 
, magnified, situated around 
the large central mouth. (J. D. Dana.) 
Fig. 620. PoLycLinum , from dead coral, Sandalwood Bay, 
Feejee Islands; 620 a, portion enlarged 25 diameters ; it is of a 
spongy texture; a circle formed by six irregular white spots sur- 
rounds the mouth; three white points surround the mouth at the 
centre; these points sometimes exhibit motions ; the mouth opens 
but very slightly, and contracts when irritated. (J. D. Dana.) 
Fig. 621. Nrpurueis (?) ——, dredged from about nine fathoms, 
Sooloo Sea; 621 a,, front and lateral views of an individual, 
magnified. 
