jan. — mar. 1857.] voyage from England 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 

 Hyalceas but more elongated. Between the fins is a slight projec- 

 tion which may be the head, but it seemed to me more like 

 a continuation of the mantle 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 Crustacea so trans- 

 parent as to be invisible in water, all except their eyes which ap- 

 peared like insolated blue specks. 



April 30th, Lat. 24-44 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 Hyalceas Figs. 9 and 

 13, already described. The former made its appearance first, and 

 when darker still, the latter species again rewarded our efforts, 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 Pteropod 

 captured this evening was Ckodora,Fig. 22, a beautiful hyaline shell, 



