28 



KR. B0NNEV1E. 



[REP. OF THE "MICHAEL SARS" NORTH 



Station 



23 



29 



31 



35 



39 



42 



48 



51 



53 



56 



62 



67 



Date 



5 ,5— Vs 



9 /3— I0 /c 



'% 



lS/o- ,9 /5 



2 %- 21 /5 



23 !-o- 2i k 



31 /o 



5 /e - 6 /e 



8 /c- s /s 



10 /6- U /6 



'%— 21 /e 



27 /s. 



N 

 Position ,y 



35° 32' 



7° 7' 



35° 10' 



7° 55' 



33° 47' 

 8 o 27' 



27° 27' 



14° 52' 



26° 3' 

 15° 0' 



28° 2' 

 14° 17' 



28° 54' 

 24° 14' 



31° 20' 



35° 7' 



34° 59' 



33° r 



36° 53' 



29° 47' 



36° 52' 

 39° 55' 



40° 17' 

 50° 39' 



Depth in m. 



























0- 50 



— 



— 



4 



— 



600 



9 



1 



— 



1 



— 



— 



— 



50— 100 



— 



— 



— 



— 



78 



Swarms 



— 



— 



— 



1 



— 



— 



100— 250 



530 



6 



— 



— 



— 



4 



— 



2 



— 



— 



1 



— 



250— 500 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



— 



1 



500— 750 



50 (sh.) 



— 



— 



— 



— 





— 



— 



— 



— 



— 



— 



750—1000 

 1000—1250 

 1250-1500 





— 



— 



— 



— 





— 



— 



— 



— 



— 



— 





— 



— 



3 



— 





— 



— 



— 



— 



— 



— 



Number of individuals of Cavolinia inflexa. 



Cavolinia; the mantle-gland is more uniform, although 

 transverse striae are still found (as in Cavolinia inflexa), 

 and the ventral lobe of the foot is very small compared 

 with the large and folded lateral lobes; the lobe-like gill 

 is developed also in Cavolinia (C. glbbosa). 



Cavolinia inflexa Lesueur. 



This warm-water form, which seldom passes beyond 

 latitude 40° N. (Meisenheimer 1905), was met with during 

 the "Michael Sars" expedition in innumerable masses off 

 the Canary Islands (Stations 39, 42) and also near Gibraltar 

 (Station 23), but sparsely in the open ocean. 



The localities noted in the table all lie within the 

 limits of distribution indicated by Meisenheimer (1905), 

 but the occurrence of this species in enormous swarms 

 so far north as between lat. 26° and 35° N. has not 

 hitherto been recorded. 



Boas (1886) distinguished two varieties of this species, 

 viz.: var. longa and var. lata, between which, however, 

 a complete series of transitional forms could be traced. 

 Geographically he found the two varieties better separated, 

 for var. lata had not been found to the north of lat. 26V2 N., 



Station 35 



42 



45 



48 



49 



51 



67 



Date "> 5 - l9 /5 23 /5- M ,5 28 /= - 29 /s 



3 V5 



Va 



5 /e— 8 /e 



2 % 



Pncl , lnn N. 27°27' 28° 2' 28° 42' 28° 54' 

 rosmon w 14 o 52 , | 14 o , 7 , 20 o - 24 o 14 , 



29° 6' 



25° 2' 



31° 20' 

 35° 7' 



40° 17' 

 50° 39' 



Depth in m. 



0— .50 — 

 50— 100 ; — — 





1 













4 











1C0— 250 1 1 1 



17 



— 





1 



1 



250- 500 — 



— 



— 





— 



— 



500— 750 — — 



— 



— 



— 



— 



— 



750—1000 — — 



— 



— 



— 



— 



— , 



1000—1250 1 — — 



— 



— 



1 



— 







1250—1500 — . 



— 



— 



— 



— 



— 



though the northern form, var. longa, had been taken also 

 to the south of that latitude. 



A broader southern and a longer northern form of 

 Cavolinia inflexa may be distinguished also among the 

 material from the "Michael Sars" expedition, the swarms 

 from the warm salt water off Gibraltar (Station 23) being 

 very much like the lata-iype, while the material taken 

 farther north consists of more or less typical specimens 

 of the longa-iypt. 



Cavolinia gibbosa Rang. 



With regard to this species also the results of the 

 "Michael Sars" expedition coincide with those of earlier 

 expeditions, Cavolinia gibbosa being characterised as a 

 warm-water species which, however, avoids the immediate 

 neighbourhood of the equator (Meisenheimer). 



Cavolinia tridentata Forskal. 



A warm-water species generally distributed through- 

 out the Northern Atlantic as far as lat. 40° N. Only 15 

 specimens were brought home by the "Michael Sars" from 

 four stations all within the known limits of distribution. 



Station 



45 



51 



53 



56 



Date 



28 /s— 29 / 6 



6 /e— 6 /e 



8 /<s— 9 /e 



W h~"k 



N 

 Position w ' 



28° 42' 



31° 20' 



34° 59' 



36° 53' 



20° 0' 



35° 7' 



33° 1' 



29° 47' 



Depth in m. 



0— 50 



50— 100 















— 











100— 250 



2 



1 



— 



1 



250— 500 



— 



— 



— 



— 



500- 750 



— 



, — 



— 



— 



750—1000 



— 



— 



— 



— 



1000-1250 



— 



— 



8 (sh.) 



— 



1250—1500 



1 



— 



— 



— 



Number of individuals of Cavolinia gibbosa. 



Number of individuals of Cav. tridentata. 



