REPORT ON THE PTEROPODA. 
37 
Station 76, July 3, 1873; off the Azores; lat. 38° IT' N., long. 27° 9' W.; depth, 
900 fathoms ; bottom, Pteropod ooze. 
Station 78, July 10, 1873 ; off the Azores ; lat. 37° 26' N., long. 25° 13' W.; depth, 
1000 fathoms; bottom, volcanic mud. 
Station 85, July 19, 1873; off Palma Island (Canaries); lat. 28° 42' N., long. 
18 c 6' W.; depth, 1125 fathoms; bottom, volcanic mud. 
Appendix to the Limacinida:. 
I. Gould has described , 1 under the name of “ Limacina (?) cvcullata,” a Mollusc 
which he found to be different from the forms of Limacina previously described. For 
this he eventually proposed to erect the new genus Agadinci. 
The species and genus are, however, described and figured in a fashion so incomplete, 
and in addition characterised so insufficiently, that it is impossible to decide with any 
certainty as to their systematic position. One may, however, notice that according to 
Gould’s figures the shell, which measures 6 mm. in diameter, exhibits a right-handed 
spiral which is not the case with any member of the Limacinidse. 
One must therefore entertain very grave doubts as to the position of this species. It 
seems to me most probable that it is a Limacina antcirctica ill-drawn (cf. Gould’s figure 
with fig. 4, PI. II., after Hooker). 
The specimen in question was obtained from the Antarctic Ocean (60° 0' S., 106° 20' 
E.). I have carefully sought among the Pteropods of the Challenger collection from that 
region, but have not been able to find anything corresponding to Gould’s description. 
A. and II. Adams have nevertheless retained 2 among the Limacinidse the title 
Agadina; and in 1867 A. Affiants described under this generic title two new species, 
but without any information as to the organisms. 
In these, however, in contrast to the Agadina of Gould, the shell is perfectly left- 
handed, and the mouth does not in any way recall the bell-like form of Limacina 
cucullata. And furthermore the operculum of one of the forms is described (though 
without any notice of the direction of the coils) as multispiral. In this there is a 
resemblance to Peraclis, and there seems some reason therefore to regard the above types 
as true Limacinidoe. 
I have found among the preparations of surface animals collected on the Challenger 
Expedition, which have been stained and mounted in balsam, one of the species described 
by A. Adams (Agadina stimpsoni), and another form of the same group, which is, however, 
quite distinct from either of the species above noted. 
Having found several specimens of Agadina stimpsoni and of Agadina, n. sp., I have 
1 The Mollusca and Shells of the U.S. Exploring Expedition, p. 486, pi. li. fig. 601. 
2 Proc. Zool. Soc. Lond., 1867, p. 309. 
