24 



KR. BONNEVIE. 



[REP. OF THE "MICHAEL SARS" NORTH 



Station 



10 



23 



29 



34 



35 



39 



42 



45 



51 



52 



53 



Date 



19 4- 21 A 



3 /5- 6 /5 



9 /s— 10 /5 



,s /s— »*/s 



ls /=- 19 /5 



20 / 5 - 2l /5 



23 /5- 24 /5 



28 /o- 29 /5 



Vs-Ve 



8 As— 7 /e 



8 /e— 9 /e 



N 

 Position „f 



45° 26' 



9° 20' 



35° 32' 



7° 7' 



35° 10' 



7° 55' 



28° 52' 

 14° 16' 



27 o 27' 



14° 52' 



26° 3' 



15° 0' 



28° 2' 

 14° 17' 



28° 42' 

 20° 0' 



31° 20' 



35° 7' 



31° 24' 

 34° 47' 



34° 59' 

 33° 1' 



Depth in m. 

























0— 50 15 



— 



— 



— 



— 



— 



— 



— 



— 



5 



1 



50— 100 2 



— 



— 



— 



— 



15 



70 



2 



— 



— 



22 



100— 250 



16 



180 



23 



— 



— 



— 



80 



1 



1 



— 



2 



250— 500 

 500— 750 

 750—1000 



— 



— 



— 



1 



— 



— 



11 



— 



— 



— 



— 















































1000—1250 



— 



5 



— 



— 



— 



— 



— 



— 



— 



— 



1250—1500 — 



— 



— 



4 



— 



— 



— 



— 



— 



4 





Station 



56 



58 



62 



64 



67 



81 



82 



84 



87 



88 



90 



92 



Date 



10 /6— «/e 



l, /s— 13 /e 



2 %- 21 /6 



2 Ve 



27 /e 



12/, 



is/. 



15/ 7 



17/, 



.8/, 



21/, 



23/,_24/, 



Position yi 



36° 53' 

 29° 47' 



37° 37' 

 29° 25' 



36° 52' 

 39° 55' 



34° 44' 

 47° 52' 



40° 17' 

 50° 39' 



48° 2' 

 39° 55' 



48° 24' 

 36° 53' 



48° 4' 

 32° 25' 



46° 48' 

 27° 46' 



45° 26' 

 25° 45' 



46° 58' 

 19° 6' 



48° 29' 

 13° 55' 



Depth in m. 

























0— 50 — 



1 



5 



— 



— 



6 



— 



1 



1 



— 



— 



— 



50- 100 25 



11 



12 



— 



— 



56 



115 



68 



2 



17 



— 



1 



100— 250 4 



15 



4 



— 



— 



2 



7 



8 



— 



8 



— 



1 



250— 500 — 



— 



— 



1 



1 



— 



— 



30 



— 



— 



— 



— 



500— 750 4 



— 



1 



14 



2 



— 



— 



33 



6 



1 



1 



— 



750—1000 — 



— 



— 



— 



— 



— 



— 



3 



— 



— 



— 



— 



1000—1250 7 



— 



2 



— 



— 



— 



2 



3 



7 



— 



— 



— 



1250-1500 — 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



Number of individuals of Clio pyramidata. 



fat figures in the table) a great many young individuals 

 were found scattered among the older ones. 



Boas (1886) has, like d'Orbigny before him, distin- 

 guished certain geographical varieties, viz: 



1) Var. angusta from the Northern Atlantic and 

 Eastern Pacific. 



2) Var. lata from the Atlantic between the latitudes 

 of 40° N. and 30° S., from the Western Pacific and the 

 Northern Indian ocean. 



3) Var. convexa from the southern part of the Indian 

 ocean. 



The distinctness of such varieties has, however, not 

 been acknowledged by later authors (Munthe, Tesch, 

 Meisenheimer). 



In the material at my disposal I have without diffi- 

 culty confirmed the existence of all three forms (textfig. 22), 

 two of which (angusta and lata) I must, with Boas, con- 

 sider as geographical (northern and southern) varieties of 

 Clio pyramidata. The most typical specimens of both 

 forms are strikingly different from each other in size as well 

 in shape. The shell of var. lata may, indeed, be very 



much like that of Clio cuspidata, with its sharp carinae, 

 its long lateral spines and its very distinct transverse 

 striation. Extreme forms of both varieties were found 

 during the "Michael Sars" expedition separated from each 

 other, var. angusta at a series of northern stations (• on 

 the chart textfig. 23), and var. lata along the Spanish- 

 African coast (© on the chart). But at the same time a 

 whole series of transitional forms were found between 

 the American coast and the Azores (ffi on the chart). At 

 all stations within this zone either transitional forms or 

 both varieties were found intermingled. 



The independent existence of a var. convexa I am 

 inclined to doubt, although I have had no opportunity 

 of studying material from the region where, according to 

 Boas, this variety is found. The reason is that among 

 my a/zg-«sta-specimens a considerable number has the 

 characteristic shape of var. convexa with the lateral carinae 

 concave posteriorly and faintly convex anteriorly. — The 

 specimen figured in textfig. 22 B was taken at St. 82 

 (48° 24' N., 36° 53' W.). Such individuals were always 

 found together with others in which no convexity was 

 traceable. 



