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



specimens with a length of more than 44.5 per cent for the 

 anterior, nor more than 29 per cent for the posterior fin. 



Fowler (1896, p. 992) recognized this similarity to S. lyra 

 but defined differences on the gronud of number of teeth and 

 seizing jaws, and of the absence of a constriction at the tail- 

 septum in S. whartoni. In the San Diego ^S*. lyra the constric- 

 tion at the tail-septum varies, and in many instances is practi- 

 cally absent, and the number of teeth and seizing jaws are 

 essentially the same as in Fowler's S. tvhartoni, as shown by 

 comparison of tables 4 and 5. It is to be regretted that Fowler 

 (1896) did not describe the vestibular ridge. However, from 

 the data at hand, it seems only reasonable to regard S. whartoni 

 as a synonym of 8. lyra. 



Through the courtesy of Dr. Broch of the University of 

 Christiania, I have been enabled to work over three of his speci- 

 mens of ^S*. gigantea, the measurements of which are as follows: 



TABLE 6 



Measurements of *S'. gigantea^ 



1 All measurements made in per cent of total length of animal. 



2 Per cent of posterior fin in front of tail-septum. 



In no. 1 the posterior fin is widest at tail-septum, and does not quite 

 reach the seminal vesicles. In nos. 2 and 3 the fin is widest behind tail- 

 septum and the seminal vesicles are not developed. 



Comparison of this material with S. lyra from San Diego 

 presents only a very few difi'erences. Broch 's specimens are 

 larger, the smallest measuring some 4 mm. more than the largest 

 S. lyra from this region. In one instance the width of >S'. 

 gigantea is only 5.8 per cent, while none of our specimens 

 measure less than 6.3 per cent. With these two exceptions all 

 the measurements of S. gigantea agree with those of *S. lyra. 



