ATLANT. DEEP-SEA EXPED. 1910. VOL. III]. 



PTEROPODA. 



29 



Cavolinia longirostris Lesueur. 



This warm-water species was taken by the "Michael 

 Sars" at two stations in the vicinity of the Sargosso-Sea: — 

 Station 51: 5 / 6 — 6 /e 1910. 31° 20' N„ 35° 7' W. 



Depth 100—250 m. 1 individual. 

 Station 52: 6 /6- 7 /e 1910. 31°24'N., 34° 47' W. 

 Depth — 50 m. 8 individuals. 



Cavolinia uncinata Rang. 



A defective individual of this species was taken near 

 the surface at Station 67 (40° 17' N„ 50° 39' W.). 



As was the case with the Limacinidae, the collection 

 of Cavoliniidae brought home by the "Michael Sars" does 

 not add materially to the number of known species, but 

 several species were taken under such conditions or in 

 such quantities as to widen our knowledge regarding 

 their generic or biological relations (e. g. Clio falcata, 

 Clio pyramidata, Diacria trispinosa). 



The results of the expedition bearing upon the geo- 

 graphical distribution of the Cavoliniidae will be dealt 

 with later. 



Cymbuliidae. 



Cymbulia Peron and Lesueur. 

 Cymbulia peronii de Blainville. 



Four individuals and two empty shells of this Mediter- 

 ranean species were taken by the "Michael Sars" off 

 Gibraltar, and as far north as the Bay of Biscay. 



Station 



10 



29 



Date 



19/ 4 _20/ 4 



9 /5— 10 /= 



N 

 Position yjj 



45° 26' 

 9° 20 



35° 10' 



7° 55' 



Depth in m. 







0— 50 



— 



— 



50— 100 



2 



— 



100— 250 



2 



1 



250- 500 



— 



— 



500— 750 



— 



— 



750—1000 



— 



1 



1000—1250 



— 



— 



1250—1500 



— 



— 



Number of individuals of Cymbulia peronii. 



Cymbulia borealis n. sp. 



In textfig. 24 I have shown a small Cymbulia? of 

 which 14 individuals without shells were brought home 

 by the "Michael Sars", most of them in very bad condi- 

 tion, and none sufficiently well preserved to allow of a 

 thorough investigation. 



Enough can be seen however to prove that it is 

 distinct from any of the earlier known representatives of 

 the Cymbuliidae. 



The proboscis is short and fixed to the underlying 

 part of the foot. The dorsal and ventral lips are continued 

 into the dorsal margin of the fins through two narrow 

 parallel ridges. 



Jaw and radula present (textfig. 25); teeth of the 

 same type as in C. peronii. 



A 



B 



Fig. 24. Cymbulia borealis n. sp. 



Fig. 25. Jaw (A) and radula (B) of Cymbulia borealis. 



