8 



TH. MORTENSEN. 



[REP. OF THE "MICHAEL SARS" NORTH 



The Ctenophores from the surface waters collected 

 by the "Michael Sars" are the following; 



1. Mertensia ovum (Fabr.). 



Station 76. (47° 11' N, 47° 6' W., s h 1910; 1 m. net, 

 50—0 m. — 2 specimens. 



One of these specimens is comparatively well preser- 

 ved, it is, indeed, the best preserved specimen I ever 

 saw of this form. The meridional vessels are distinct 

 (in all other specimens, which I have examined, they 

 are quite indiscernable); they are strongly folded, so that 

 I thought at first to see here the proliferations observed 

 by Mertens. There can, however, be no doubt that the 

 folds are simply due to the contraction on preservation. 

 The locality is in the Labrador Stream. 



2. Pleurobrachfa pileus (O. Fr. Mull.). 



Station 71. (43' 18' N., 51° 17' W. 3 % 1910). 

 1. Surface; 1 m. net, 11 specimens. 

 3. 100 m. wire; 1 m. net, 4 specimens. 

 8. 300 — young fish trawl ; 8 specimens. 



— 72. (44= 35' N., 51° 15' W. V? 1910). 



3. 30 — m., 1 m. net, 16 specimens. 



— 97. (56° 15' N, 8° 28' W. Vs 1910). 



3. 50 m. wire; young fish trawl; 1 specimen. 



— 102. (60° 57' N., 4° 38' W. 9 /s— 1 % 1910). 



22. 1 m. net; surface; 1 specimen. 



3 /i 200 m. wire; 2 specimens. 



The specimens are upon the whole very well preserved, 

 so that there can scarcely be any doubt of the determination. 

 The species Pleurobrachia brunnea recently described by 

 A. G. Mayer 1 ) from the coast of New Jersey appears not 

 to be among them; to be sure, it will probably always 

 be very difficult to discern the most prominent of the 

 specific characters of this species, viz. the terminal knob 

 of the tentacles, in preserved specimens; but the shape 

 and colour of the specimens does not suit to PI. brunnea. 

 The captures of the "Michael Sars" of PL pileus do 

 not appear to me to warrant any conclusion regarding 

 its bathymetrical distribution. 



3. Beroe cucum/s Fabrieius 



Station 10. (45= 26' N., 9' 20 7 W. n k— u U 1910). 



300 m. wire; yong fish trawl, 2 fine, medium sized 

 specimens. 



6. 1 m. silknet; 100 m. wire out; 3 small specimens. 



7. 1 m. silknet; 200 m. wire; 2 small, badly preserved 

 specimens. 



— 42. (28'' 2' N., 14- 17' W. 2 %— 2i h 1910). 



Young fish trawl; 900 m. wire; 2 very badly preserved 

 small specimens. (The identification not beyond doubt). 



— 49. (29° 6' N., 25' 2' W. Ve 1910). 



24. 1 m. silknet; 270 m. wire out; 1 small, badly preserved 

 specimen. 



l ) A. G. Mayer: Ctenophores of the Atlantic Coast of North 

 America. Publ. Carnegie Inst. Washington, No. 162. 1912. 



2000 m. wire; 1 small, badly 

 wire; 1 large, badly preserved 



Station 53. (34° 59' N., 33° 1' W. Vs-Ve 1910). 



32. Young fish trawl; 600 m. wire; 1 small, poorly preserved 

 specimen. 



42. Young fish trawl; 1600 m. wire; 1 medium sized 



specimen. 



45. Bottom net ; 2100 m. wire; 1 small specimen. 



54. Young fish trawl; 1600 m. wire. Fragment of a large 



specimen. 



56. (56° 53' N., 29° 47' W. "«/e— "Ve 1910). 



2. Silknet; surface; 1 large specimen. 



Young fish trawl; 300 m. wire; 1 large specimen. 



63. (36° 5' N., 43° 58' W. 22 / 6 1910). 



16. 3 m. silknet; 4500—1500 m. wire; 1 small specimen. 



22. 3 m. silknet; 1356 — 450 m, wire; 1 large specimen. 



64. (34° 44' N., 47° 52' W. 24 /<s 1910). 



34. Young fish trawl; 2000 m. wire; 2 medium sized 

 specimens. 



50. Young fish trawl ; 

 preserved specimen. 

 ? 3 m. net; 3000 m. 

 specimen. 

 71. (43° 18' N., 51° 17' W. 3 % 1910). 



1. 1 m. net; surface; several small specimens. 



3. 1 m. net; 100 m. wire; 1 medium sized specimen. 

 76. (47° 11' N, 47° 6' W. 9 A 1910). 



1 m. net; 50—0 m.; 1 medium sized specimen. 

 80. (47° 34' N., 43° 11' W. "h 1910). 



18. 3 m. net; 3000, 2500, 2000 m. wire; 1 large specimen. 

 81 (48° 2' N., 39° 55' W. 12 / 7 1910). 



16. 1 m. net; surface; 1 medium sized specimen. 



27. 3 A m. silknet; 2500 m. wire; 1 small, badly preserved 

 specimen; the determination not quite certain. 



33. 3 m. net; 3000 m. wire; 1 medium sized specimen. 

 82. (48° 24' N., 36° 53' W. I3 / 7 1910). 



13. 3 A m. net; 1500 m. wire; 1 small specimen. (The 

 determination not quite certain). 



38. Young fish trawl; 2000 m. wire; 1 small, badly 

 preserved specimen. 



— 84. (48° 4' N., 32° 25' W. 15 / 7 1910). 



21 a. Young fish trawl; 2000 m. wire; 1 large specimen. 

 37 Young fish trawl; 3000 m. wire; 1 small specimen. 



87. (46° 48' N., 27° 46' W. l7 /v 1910). 



11a. Young fish trawl; 2000 m. wire; 1 large specimen. 



88. (45° 26' N., 25° 45' W. ,8 A 1910). 



17. s /t m. net; 1500 m. wire; 1 medium sized specimen. 

 90. (46° 58' N., 19° 6' W. 2l / 7 1910). 



23. 3 A m. net; 1500 m. wire; 1 medium sized specimen. 

 92. (48° 29' N., 13° 55' W. 2 V? 1910). 



41. Young fish trawl; 1000 m. wire. 1 medium sized 

 specimen. 



— 98. (56° 33' N., 9° 30' W. Vs 1910). 



31. 3 m. net; 1500 m. wire; 1- large and 1 small specimen. 



35. 1 m. silk net; surface; 1 medium sized specimen. 



- 101. (57° 41' N., 11° 48' W. Vs 1910). 



20. Young fish trawl; 2000 m. wire; 1 small specimen. 



- 102. (60° 57' N., 4° 38' W. Vs 1910). 



3. 3 m. net; 1500 m. wire; 5 medium sized specimens. 



5. Young fish trawl; 1000 m. wire; 2 small, badly 

 preserved specimens. 



6. 3 A m. silk net; 1400 m. wire; 1 small, 1 medium 

 sized specimen. 



36. 1 m. net; 100 m. wire. 1 small specimen. 



