A REVIEW OF THE MYSIDACEA 



185 

 This group repre- 



one-third of the proximal (figs. 68, a; 69, «, b) 

 sents the true Neomysis rayii of Murdoch. 



(2) Material from San Francisco and San Pablo, between latitude 

 N. 28° to 38°. Shallow water, 4 to 16 fathoms. Rostral plate less 

 than half as long as broad ; eye twice as long as broad ; terminal por- 

 tion of the telson between the last pair of spines on the lateral margin 



Figure 70. — Neomysis rayii (Murdoch): a, Fourth pleopod of male, X 17}^; b, telson, 

 X 17%. (From a British Columbia specimen.) 



and the apex longer than broad; distal joint of the exopod of the 

 fourth pleopod of the male one-sixth of the proximal (fig. 71, ar-c) . 

 This group represents the true Neomysis franciscorum of Holmes. 



(3) Material from the deeper water off the coasts of British Colum- 

 bia, about latitude N. 48°, 15 to 123 fathoms. Intermediate in char- 

 acter between groups 1 and 2, having the telson of rayii and the male 

 pleopods of franciscorum (figs. 68, b, 70, a-b). 



Two interpretations of this material are possible : (1) That the two 

 species N. rayii and N. franciscorum are distinct and that the British 

 Columbia form represents an intermediate deep-water species, or (2) 

 that there is a single widely distributed species showing minor varia- 

 tions with geographical and bathymetrical range. 



