I7 6 DISCOVERY REPORTS 



terminating in a rounded embryonic shell (one of 2-5 mm. the other two of c. 1 mm.). The others are 

 slightly older, representing 'stage B' of Tesch, 3 mm. in length. The species is, according to Tesch, 

 eurythermic, ranging widely from the tropical into the temperate Atlantic. 



Table 5. Occurrences of Cavoliniidae and Cymbulidae 



Station 



WS986 



WS986 

 WS996 

 WS997 

 WS 997 



WS997 



WS986 



Time 



Depth (m.) 



Diacria trispinosa 



1118 



100-50 

 250-100 



Euclio pyramidata 



1118 

 1858 to 1610 

 0105 to 0410 



1000-750 

 500-250 



50-0 

 750-500 



Cavolinia inflexa 

 0105 to 0410 250-100 



Cymbulia peroni 



1118 



100-50 



No. of animals 



3 juveniles 

 2 juveniles 



1 juvenile 



2 juveniles 

 2 juveniles 

 1 juvenile 



1 juvenile 



1 juvenile 



Euclio pyramidata (Linn.) 



1767 Clio pyramidata Linnaeus, Syst. Nat. ed. 12, 1, pt. ii. 



1905 Clio pyramidata Meisenheimer, Pteropoda, Wiss. Ergebn. D. Tiefsee-Exped. 'Valdivia', ix, 21. 



1946 Euclio pyramidata Tesch, Dana Reports, xxvm, p. 14, pi. ii, fig. 11. 



This is much the most numerous species of the genus, and is widely distributed throughout the 

 Atlantic. Four records were obtained, all from the deeper layers and represented by a few very young 

 specimens. They are not easy to identify after the erosion of the shell by formalin, and two measure 

 only 1 mm., the larger ones about 3-5 mm. They are placed in pyramidata, since they show no trace 

 of the enlarged foot characteristic of the rest of the species of the genus. 



Cavolinia inflexa (Lesueur) 



1813 Hyalaea inflexa Lesueur, Mem. sur quelques Anim. Moll, etc., Nouv. Bull. Soc. Philom. Ill, 281-5, figs. i-v. 

 1905 Cavolinia inflexa Meisenheimer, Pteropoda, Wiss. Ergebn. D. Tiefsee-Exped. 'Valdivia,' ix, 35. 

 1946 Cavolinia inflexa Tesch, Dana Reports, xxvm, p. 30, pi. iii, fig. 21. 



This species occurred at WS 997 only, represented by very young specimens — 1 mm. long. It is to 

 be regarded as a very common species from 40 N to 40 S — and it is worthy of remark that no more 

 numerous or adult material of any of the above pteropods was available. 



Cymbulia peroni de Blainville 



1 8 18 Cymbulia peroni de Blainville, Diet, de Sci. Nat. xn. 



1946 Cymbulia peroni Tesch, Dana Reports, xxvm, p. 37, pi. v, figs. 27, 28. 



One juvenile specimen of the eastern Atlantic species Cymbulia peroni was taken, at 50-100 m. 

 at WS 986. 



