1913] Mithacl: Sagitta califondca from San Diego Region 93 



back of jaw, and extending into point from 60 to 70 per cent 

 of its height. Pulp evenly distributed throughout canal. 



Ovaries (pi. 2, fig. 1), long and slender. The mature ovary 

 varies in length from 21.6 to 26.9 (in one ease 32.3) per cent 

 of total length of animal, and in width from 5.2 to 7.8 per cent 

 of its length. It extends, when mature, beyond the posterior 

 limit of anterior fin, although it never reaches the anterior limit 

 of fin. Ovaries approaching maturity have not been noted in 

 individuals under 22.1 mm. in length. Ova small even when 

 mature. 



S. californica is readily distinguished from all other species 

 of Sagitta by its long collarette. In S. plaiiktonis this structure 

 extends caudally to the ventral ganglion, and in S. ferox to the 

 anterior fins. In all other species its limit lies anterior to the 

 ganglion. Thus the fact that the collarette extends in S. cali- 

 fornica from head to seminal vesicles makes it utterly impossible 

 to confuse it with an.y other known species. 



Tabular Measurements. — As in my previous paper (1911) 

 I have endeavored to include enough mea.surements in table 1 

 to enable a fairly accurate reconstruction of the outline of each 

 individual considered, when taken in connection with the fore- 

 going description. In addition, whenever the right ovary differed 

 conspicuously in length from the left one, both were measured, 

 and in the table the length of the left ovary appears below that 

 of the right one. In anterior and posterior teeth and seizing 

 jaws the number in both right and left rows is given, the latter 

 following the former. Finally the following symbols are used 

 to designate the stage of maturity in ovary and seminal vesicle : 



inv. — invisible. 



V. rem. — very remote from maturity. 



rem. — remote from maturity. 



inmi. — immature. 



w. (lev. — well developed. 



appr. — approaching maturity. 



mat. — fullv mature. 



