JAN. — MAR. 1857.] voyage from' E77 gland to Madras. 153 
was clear as glass, with various patches of pale rust color. The 
animal was purple and could be seen through the transparent shell. 
Fig. 14 was a solitary specimen with well marked characters, a 
small shell of compressed form with the aperture narrowed into a 
canal, posterior spine somewhat imperfect, color purple. The animal 
was dead and could not be satisfactorily examined. The flask- 
shaped Cuvieria Fig. 26, when in motion, usually propelled itself in 
a straight course with the open part of the shell forward. It is pro- 
vided with fins very similar in form 'and situation to those of the 
Hijalocas but more elongated. Between the fins is a slight projec- 
tion which may be the h*ead, but it seemed to me more like 
a continuation of the m An tie or membrane which forms the fins. 
The shell which is well represented in Fig. 26, is colourless and 
transparent as the clearest glass ; in several of the specimens the 
rounded extremity of the shell shows marks as though it had for- 
merly been prolonged into a point, which probably becomes deci- 
duous when the animal approaches maturity as is the case with 
several of the Gasteropodos. In the net along with these were 
several specimens of Erichthus and other Ckustacea so trans- 
parent as to be invisible in water, all except their eyes which ap- 
peared like insolated blue specks. 
April 30th, Lat. 2444 S.Long. 37-41 W. this evening about 5| 
P.M. in daylight we put over the net and soon got many specimens of 
a small Creseis Fig. 23, the shell is of a spicular form,and longitudi- 
nally carinated at one side where the open end of the shell is pro- 
longed into a sharp point. The animal is a Pteropod of a pale 
purple color, they move briskly by means of two fringed fins, 
between which is a fringed projection or plume, which appears 
to be a continuation of the expanded membrane forming the fins. 
As twilight set in, we caught more of the Hyalonas Figs. 9 and 
13, already described. The former made its appearance first, and 
when darker still, the latter species again rewarded our eff'orts, and 
it was interesting to observe that each kind was taken at about the 
same hour as on the previous evening, although we had in the in- 
terval sailed a distance of nearly 170 miles. Another Ptekopod 
capturedthis evening was Cleodora,Y\^. 22,a beautiful hyaline shell, 
