JAN. — MAK. 1857.] voyage from England to Madras. 161 
to produce such remarkable aberrations in species ; it is however 
more elongated in form, and its lateral spines are less produced. 
Its deep brown color is worthy of note among shells most of which 
are of glassy transparency. In the net with these were several spe- 
cimens of lanthina exigua and three or four Cleodoras, larger and 
of a more elegant and curvilinear form than the last. Their general 
appearance is well depicted in Fig. 21. The animal is provided with 
two alar appendages of considerable size and moves rapidly. 
June 18th, Lat. 1.12 S. Long. 78-44 E. This evening just before 
darkmany specimens of lanthma/ragilis floated by the ship. What 
first attracted our attention Vas the f/dac? appearance of their 
vesicular floats which we» could thus readily distinguish from the 
particles of foam caused by the motion of the ship, we soon captur- 
ed in our net a considerable number of them in very perfect condi- 
tion, [see Fig. 4.] the shell is covered with a very delicate epiderimis 
the animal when handled exudes a purple stain ; when in a state of 
repose on the surface of the water the shell is entirely submerged 
the float only being above the surface except that it occasionally 
raises its proboscis and mouth armed with numerous slender curv- 
ed teeth visible to the naked eye ; the float is attached to the foot of 
the animal from which it could be readily detached or peeled off', ap- 
parently without injuring the animal. Most of the specimens taken 
were the I./ragilishut among them were three examples of the 
thina glohosa Fig. 5. This shell is in color a deeper blue and it wants 
the carinated form of I.fragilis. The floats of these molluscs have 
been repeatedly described and commented upon by authors. It was 
observable that the float of/, glohosa was more loosely constructed 
and of a more irregular form than that of /. /ragills. One of the 
former had the lower part of its float studded with egg capsules, 
having the appearance of a cluster of small pendulous blue vesicles, 
each of which, when examined under a microscope, was found to 
contain numerous minute ovules of a pale blue color. Shortly after 
8 P.M. we got several additional specimens of Cleodora^ Fig. ,21 
and about 9 p. m. a small specimen of Argonauta, Figs. 
1 and 2 — not the Argonauta argo^ but an allied species of a horn 
color, having a broader keel and fewer tubercles. The animal be- 
longs to the Caphalopoda, already mentioned as the highest class 
