1911] Kofoid: The Genus Gonyaulax. 247 



tions on tlie surface well developed. Neither drawing nor full 

 description was obtained. 



This species was described by Stein (1883) from the Pacific 

 and has since been reported by Murray and Whitting (1899) 

 from the temperate and tropical Atlantic between 4° and 42° N 

 and 20° to 66° W; by Zacharias (1906) from the Gulf of Naples, 

 by Entz (1907) from Quarnero, and by Karsten (1907) from 

 the northwestern part (9° N, 54° E) of the Indian Ocean. It is 

 apparently a rare oceanic species of the warmer seas. 



3. Subgenus Acanthogonyaulax subgen. no v. 

 Represented by Goinjaulax ceratoc oroides Kofoid, a tropical 

 species described by ]\Iurray and Whitting as Ceratocorys spini- 

 fera. See Kofoid (1910). Not as yet found at San Diego, but to 

 be expected in the winter plankton. 



4. Subgenus Steiniella (Schiitt) Kofoid 



Steiniella Schiitt (1895, p. 151, pi. 6, fig. 26; 1896. p. 19, fig. 26. 

 Not Steifiiella Bernard (Protococcaceae) (1908, p. 189). 



Characterized by a laterally compressed apex which is car- 

 ried over on to the dorsal face of the epitheca. Large rotund 

 body with very fragile theca, often faintly marked with longi- 

 tudinal vermieulations. Three or four apicals and no anterior 

 intercalary. Ventral pore sometimes absent ("?). 



This subgenus falls into three groups of unequal content : 

 the fragilis group, rotund, without constriction behind girdle, 

 the hispinosa group, with marked constriction, containing G. 

 hispinosa Kofoid and Michener, and the mitra group, greatly 

 elongated and laterally compressed, containing G. mitra (Schiitt) 

 Kofoid. Only representatives of the first named group have as 

 yet been discovered in the San Diego region. 



g). The Fragilis Group 



Characterized by rotund form of body, with no differentiated 

 apical horn, no constriction immediately behind the girdle, and 

 predominantly longitudinal markings. 



Here belong G. fragilis (Schiitt), G. hijalina Ostenfeld and 

 Schmidt, and G. alaskensis sp. nov. 



