NORTH AMERICAN PLANKTON. 77 



A species of Corynura, from the St. Lawrence, also 

 appears to be new, and is described as G. discaudata, n. sp. 

 It was also found in Puget Sound (see Appendix, p. 84). 



Oithona spinifrons occurred in considerable numbers 

 almost throughout the collections. All the specimens of 

 Oithona observed have been ascribed to this species, 

 although their mutilated condition rendered identification 

 somewhat difficult. Clusters of ovisacs belonging to this 

 species were found in many of the collections. 



Onccea con if era occurred sparingly in the collection made 

 between Quebec and 30 miles west of Rimouski. The 

 present record is a considerable extension of its limit of 

 distribution. 



Onccea venusta also occurred sparingly in the collection 

 made between lat. 56° 30' N., long. 18° W., and lat. 56° 

 30' N., long. 24° 22' W., which is an extension of its limit 

 of distribution in the North Atlantic. 



Ectinosoma sarsii occurred in the last of the outw T ard 

 and first of the homeward collections made between 

 Rimouski and Quebec. The species does not appear to 

 have been previously recorded from the American coasts, 

 so that the present collection show T s a considerable exten- 

 sion of its distribution. 



Ectinosoma atlanticum has a world-wide distribution ; 

 it occurred in several of the gatherings, but only sparingly. 



Longipedia coronata was only observed in the collection 

 made between Liverpool and the north of Ireland. 



Thalestris serrulata occurred sparingly in three collec- 

 tions, those between Liverpool and the north of Ireland, 

 in the Straits of Belle Isle, and between Rimouski and 

 Anticosti. Out of British seas this species has not hitherto 

 been recorded, so that the present collection shows a con- 

 siderable extension of distribution of the species, which is 

 apparently one of the pelagic Harpacticidge. 



