246 University of California Publications in Zoology. [Vol. 8 



2. Subgenus Fusig-onyaulax subgen. nov. 

 Sectio Fxisiformes, Lemmermann (1907), p. 299. 



Body elongated, fusiform, with centrally located well differ- 

 entiated apical and antapical horns. Girdle not displaced more 

 than 3 furrow widths. Usually three (rarely two or four) apicals 

 and no (rarely one) anterior intercalary. [ usually from tropical 

 or warm temperate waters. 



This subgenus may be divided for convenience in treatment 

 into two groups, the hirosiris group with elongation exceeding 

 two transdiameters. and the acuta group, with elongation less 

 than two transdiameters and therefore containing the stouter, 

 more robust members of the subgenus. 



e). The hirostris Group 



Characterized by a length exceeding two transdiameters, an 

 apical horn equaling or exceeding a transdiameter in length, 

 and a tinned central antapical spine of nearly equal length and 

 by a subglobular or ellipsoidal midbody. Surface pitted or 

 areolated. 



This group contains Gonyaulax hirostris Stein, G. liighleii 

 ]\Iurray and Whitting, and G. glyptorhynchus Murray and Whit- 

 ting. This group of species is in need of careful revision, for it 

 is desirable that distinctions between the species be more clearly 

 defined. 



Represented at San Diego l)y G. hirostris Stein. 



12. Gonyaulax birostris Stein 



Gonyaulax hirostris Steiu (1883), pi. 4, fig. 20 



Diagnosis : Body elongated fusiform, with abruptly swollen 

 micibody, girdle displaced 1.5 furrow widths, apical precingular 

 suture oblique. Apical 1' very narrow. Antapical spine equal- 

 ing transdiameter in length. 



A single individual referable to this rare species was taken 

 in surface collection (No. 679) made September 24, 1904, ten 

 miles WNW of Point Loma. It was somewhat shorter than 

 the specimen shown in Stein's (1883) figure and had the areola- 



