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



PTEROPODA. 



25 



Station 



23 



35 



39 



42 



45 



46 



47 



49 



52 



53 



56 



58 



62 



64 



67 



Date 



5 /5- G /5 



18 / 6 - 19 /5 



20 / 5 - 21 /5 



23/ 5 _24/ 5 



28 /o- 29 /5 



29 /s 



30 /5 



Ve 



Ve-Ve 



Ve-'/e 



10 /6- U /6 



»/6- 13 /6 



2 °/e- 21 /6 



24 /e 



27 /6 



N 

 Position w ' 



35° 32' 



7° 7' 



27° 27' 

 14° 52' 



26° 3' 

 15° 0' 



28° 2' 



14° 17' 



28° 42' 

 20° 0' 



28° 56' 

 21° 45' 



29° 2' 



22° 53' 



29° 8' 

 25° 16' 



31° 24' 

 34° 47' 



34° 59' 

 33° 1' 



36° 53' 



29° 47' 



37° 37' 

 29° 25' 



36° 52' 

 39° 55' 



34° 44' 

 47° 52' 



40° 17' 



50° 39' 



Depth in m. 

 0— 50 













1 







5 



2 







10 







50— 100 



— 



— 



4 



3 



7 



— 



— 



— 



49 



70 



84 



1 



3 



— 



— 



100— 250 



4 



— 



— 



— 



1 



— 



— 



— 



— 



3 



4 



— 



— 



— 



— 



250— 500 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



20 



5 



500— 750 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



2 



— 



— 



92 



— 



750—1000 



_ 



— 



— 



— 



— 



— 



1 



— 



— 



— 



— 



— 



— 



3 



— 



1000—1250 



— 



— 



— 



— 



— 



— 



— 



2 



— 



— 



3 



— 



— 



— 



— 



1250—1500 



— 



1 



— 



— 



— 



— 



1 



— 



— 



— 



— 



— 



— 



— 



Number of individuals of Styliola subula. 



Subgen. 2: Styliola Lesueur. 

 Clio (Styliola) subula Quoy and Gaimard. 



This species is characterised by Meisenheimer (1905) 

 as a warm-water form occurring on both sides ot the 

 equator, though it seems to avoid the warmest water. The 

 northern limit of its distribution is found abt. lat. 40° N. 



The results of the "Michael Sars" expedition conform 

 to this distribution, Styliola subula having been found at 

 numerous stations during the 

 southern crossing of the ocean, 

 the most northerly station (67) 

 in latitude 40° 17' N., but not 

 a single specimen was found 

 during the northern crossing 

 between Newfoundland and 

 Ireland. It occurred in great 

 numbers off the Azores at Sta- 

 tions 52, 53, 56. 



Subgen. 3: Creseis Rang. 

 Clio (Creseis) acicula Rang. 



This species is also con- 

 sidered by Meisenheimer to be a 



warm-water form, but with a wider distribution than Styliola 

 subula, being found in the warmest water near the equator 

 as well as in the temperate water of the Gulfstream (48° N.). 



A comparison of the tables shows a very characteristic 

 difference in the horizontal distribution of Styliola subula 

 and Creseis acicula, for in the open ocean the two species 

 were found practically at the same stations, but near the 

 African coast (Stations 23, 35, 39, 42, 45) and near the 

 Azores (Stations 56, 58) Creseis acicula was absolutely 

 wanting. 



Subgen. 4: Hyalocylix Fol. 



Clio (Hyalocylix) striata Rang. 

 This species is very sparsely represented in the 

 material from the "Michael Sars" expedition (see the 



table), a fact which confirms the results of earlier investi- 

 gators with regard to its geographical distribution. It is 

 regarded by Meisenheimer (1905) as a warm-water species 

 belonging to the zone between 30° N. and 30° S., though 

 occasionally passing beyond that zone. 



As only a few of the "Michael Sars" stations lie 

 within this zone, the individuals brought home probably 

 represent stray visitors in northerly waters. 



Station 



47 



48 



49 



52 



53 



62 



64 



67 



Date 



30 /o 



3 Vb 



V. 



6 /e- 7 /6 



8 /6— 9 / 6 



"%— 21 /e 



2 Ve 



27 / 6 



N 

 Position w ' 



29° 2' 

 22° 53' 



28° 54' 

 24° 14' 



29° 8' 

 25° 16' 



31° 24' 



34° 47' 



34° 59' 



33° 1' 



36° 52' 

 39° 55' 



34° 44' 



47° 52' 



40° 17' 

 50° 39' 



Depth in m. 

 0- 50 



1 



41 









5 



1 



17 



50— 100 

 100— 250 



— 



— 



— 



20 



10 



— 



13 



4 



250- 500 

 500— 750 

 750-1000 



— 



— 



— 



— 



— 



— 



6 



1 



— 



1000-1250 



— 



— 



— 



— 











— 







1250-1500 



— 



— 



7 



— 



— 



— 



— 



— 



Number of individuals of Creseis acicula. 



Station 



23 



48 



51 



52 



64 



24 /e 



69 



Date 



5 /5— 6 /5 



31 /= 



5 /e— Ve 



Ve— Ve 



29 /6 



Position yl 



35° 32' 



7° 7' 



28° 54' 

 24° 14' 



31° 20' 

 35° 7' 



31° 24' 

 34° 47' 



34° 44' 

 47° 52' 



41° 39' 



51° 4' 



Depth in m. 



0— 50 



50- 100 















— 



1 







1 











100— 250 



1 



— 



1 



— 



1 



2 



250— 500 



— 



— 



— 



— 



1 



— 



500- 750 



— 



— 



— 



— 



1 



— 



750—1000 



— 



— 



— 



— 



— 



— 



1000-1250 



— 



— 



— 



— 



— 



— 



1250-1500 



— 



— 



— 



— 



— 



— 



Number of individuals of Hyalocylix striata. 



