160 Pelagian Molimca collected on a [no. 2, new series, 



color white or nearly transparent; animal slightly tinged with pur- 

 ple ; habits, so far as can be observed, do not appear to differ from 

 those of the Hyalecas already described. On this evening we also 

 obtained several Cuvierias ; a genus we had not met with since April 

 29th inLat. 22-1 S. Long. 38-7 W; all these were taken before 8 

 p. M. 



9th June, Lat. 22-40 S.Long. 84-27 E. a little before 5 p. m. 

 we took from the net several Cuvierias and one Hyalcea, Fig. 12. 

 This species of Hyalaa we have always got earlier than any other 

 but never before in daylight as on this occasion, which was half an 

 hour before sunset : later this evening we got no more Ptekopods 

 but great numbers of Atlanta, Fig. 7, already described, and a con- 

 siderable number of a Gasteropodous Mollusc " lanthina exigua" 

 the characteristic striae of which are well shown in Fig. 3. Most of 

 them were empty shells and none had the animal alive. 



On the following evening about 6 p. m. in Lat. 21-5 S. Long. 

 83*46 E. we got a few more lanthina exigua in a similar condition 

 and with them two Cuvierias and a few specimens of Hyalcea, Fig. 

 12. For the next few days we met with tolerable success but got 

 nothing new. 



On the 16th June in Lat. 4-32 S. Long. 80° 4 E» a little before 

 8 p. m. we took in the net a species of Hyal^a, Fig. 18, somewhat re- 

 sembling Fig. 13, but more globose and with its spines less deve- 

 loped. The most part of the shell is transparent and colorless, but 

 the anterior surface is claret colored deepening in color towards 

 the aperture ; animal nearly white with a tinge of purple ; mode of 

 progression similar to those already described, 



June 17th, Lat. 2-15 S. Long. 79 J E. at dusk we caught in the 

 net several small Cleodoras about a quarter of an inch long tri- 

 angular, wedge-shaped and pointed as represented in Fig. 20. The 

 animal is of a pale milky color and moves actively by means of its 

 two expanded fins, between which is visible a slight projection 

 which appears like a head ; with these we found several Atlanta 8 

 and a Hyalaa similar to that obtained on the previous evening. Later 

 in the evening when quite dark, we took in our net two specimens 

 of a brown Hyalcea, Fig. 19, which I am not prepared to say is 

 specifically distinct from Fig. 13, as a difference in locality is known 



