EASTERX CAXADIAN PLANKTON 



95 



December, 1913, in Massachusetts bay (1917, p. 246). On the European coast it 

 occurs in the Mediterranean and was found by Traustedt in the English Channel 

 (Apstein, 18M, p. a6). 



Salpa democratica Forsk. proles solitaria ( =^ )nucronafa). 

 1912. Ihle, p. 51. 



C.G.S. Acadia. 



This is the most widely distributed and the most abundant of all the Salpae, 

 according to Apstei'a (1894, p. 32). In northern waters the records seem to show 

 that it does not extend as far to the north as S. fusiformis, but, where it does occur, 

 it is more abundant than the latter. Bigelow obtained it in the gulf of Maine in 

 1912 (1914, p. 121), and south of New York in 1913 (1915, p. 275). On the European 

 coast it appears rather regularly. It enters the English Channel and reachfes the 

 coast of Noi*W'ay, but does not enter the North sea (Apstein, 1911, p. 153). 



Salpa zonaria (Pallas) proles ^egata. 

 1912. Ihle, p. 54. 



C.G.S. Acadia. 



This species is widely distributed but not abundant. In the north, its distribu- 

 tion extends as far as Iceland (Apstein, 1894, p. 36). On the American coast Bigelow 

 (1915, p. 275) obtained it south of the latitude of New York in 1913. On the 

 Europ€.an coast, Farran (1906) obtained it off the Irish coast in 1903 a-nd 1905. 



An individual of the aggregated generation, 40 mm. long and one of the solitary 

 generation, 55 mm. long, are in the collection of the Atlantic Biological Station, St. 

 Andrews, New Brunswick, a-ad are presumed to have been obtained at Grand Manan 

 in 1910, which shows that it occasionally enters the bay of Fundy. 



Doliolidae. — The larva develops into an oozooid, which by budding produces tro- 

 ^hozooids, phorozooids and gonozooids. Only the gonozooids become sexually mature. 

 The oozooids rapidly degenerate and cannot be identified as to the species. 



Doliolum nationalis Borgert. Phorozooid stage. 

 1913. Neuma-nn, p. 18. 



C.G.S. Acadia. 



From the results of the Plankton expedition (see Borgert, 1894) it was to be 

 expected that D. tritoms or D. Tcrohni would appear in our Gulf Stream stations. 

 These species have been found much farther to the north than has D. n<iti)on<iilis. 

 This latter species is rare on the European coast, but was found at a number of 

 points in the English Cliannel in November, 1904 (Apstein, 1911, p. 156). 



