CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 53 



A. Agassiz, from the Pacific coast of North America. Moser, 1908, 1909, 

 records it from the eastern coast of Japan and also from the Antarctic, 

 Pacific, and Indian oceans. 



In September, 19 10, I visited Newfoundland in order to examine a 

 sufficiently large number of B. cucumis to be assured that it is actually 

 specifically distinct from B. ovata. No differences can be detected in the 

 immature individuals of both species. When mature, however, some of 

 the side branches from the meridional vessels join with the paragastric 



Fig. 12. — Young Beroe cucumis 19 mm. long. From life by the author. Hali- 

 fax, Nova Scotia, September 27, 1910. Peripheral canal-systems of two broad 

 sides are separated one from the other, and there is no ring-canal around mouth. 

 The canal-system is in a stage characteristic of the adult Cestidce. 



canals in B. ovata, but this does not occur in B. cucumis. Moreover the 

 side-branches anastomose in B. ovata, but m B. cucumis they remain 

 separate one from another (see fig. 76, plate 17.) In B. forskali of the 

 Mediterranean, Pacific, and Antarctic oceans, the fusions between the side 

 branches and the paragastric canals are more frequent than in B. ovata, 

 but I am not sure that the difference is actually a specific one, for it 

 may be of an intergrading character. 



