160 Pelagian Mollu&ca 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 HyaJccas 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. 
w^e took from the net several Cuvierias and one Hyalcea^ Fig. 1 2. 
This species of Hyalcea 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 Pteropods 
but great numbers of Atlanta, Fig. 7, already described, and a con- 
siderable number of a Gasteropodoijs Mollusc " lanthina exigiia'^ 
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. ivr. we took in the net a species of Hyal^sa, 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. 79i 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 Aila7ita^ 
and a Hyalcea 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 
