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University of California Puhlications in Zoology. [Vol.8 



number of anterior teeth that they [S. kispida Aida] were not 

 hispida Conant." It seems, however, that variation in number 

 of both anterior and posterior teeth in many species is not 

 referable to specific differences, but probably to some distribu- 

 tion factor. 



5. Number of Seizing Jaws. In number of seizing jaws we 

 found that (S\ rohusta varies from 5 to 7, while 8. kispida has 

 only 8 or 9. Shall we claim that this is of specific value? In 

 looking over this paper we find the following variations in num- 

 ber of seizing jaws : 



TABLE 26 



Number of Seizing Jaws in the San Diego species. 



Number Comparison with other 



Species of jaws reports 



S. enflata 8-9 6-10 Fowler (1906) 



S. hexaptera 5-9 3-9 Fowler (1906) 



S. lyra 4-9 7-9 Ritter-Zahony (1909) 



S. sermtodentata 5-7 6-8 Fowler (1905) 



S. planktonis 8-9 8-10 Fowler (1905) 



S. neglecta 7-9 5-8 Fowler (1906) 



S. bi punctata 7-8 8-10 Fowler (1905) 



A glance at this table shows that, in *Sf. enflata, S. hexaptera, 

 8. lyra, and 8. neglecta, a variation of four or more seizing jaws 

 occurs. We can be sure, therefore, that such a variation may 

 be within the range of a single species. Finally, when we con- 

 sider Aida's 8. hispida, it becomes all the more probable that 

 8. hispida Conant and 8. robust a Doncaster are the same species, 

 for the reason that Aida's specimens have 7 or 8 seizing jaws. 



It is to be regretted that there was not more than one speci- 

 men of 8. hispida at my disposal and that for this reason it has 

 been impossible to dissect it and so draw and describe many of 

 the features rendered obscure by its long preservation and dis- 

 coloration. Nevertheless, I am convinced that the two species 

 are identical. 8. hispida Conant should, therefore, have prior 

 claim and 8. robusta Doncaster must take its place in synonymy. 



