144 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



with 3 or 4 distantly placed spines; the distal three-fifths of the mar- 

 gins with the spines crowded together; apical pair of spines about 

 one-tenth of the telson in length ; no plumose setae. 



Inner uropod (fig. 51, h) about 1% as long as the telson; inner 

 margin armed with a dense row of large blunt spines, about 50, ex- 



Figure 52. — Mysidopsis calif ornica Tattersall: a, First thoracic limb, X 100; b, second 

 thoracic limb, X 100; c, third thoracic limb, X 100. 



tending from the level of the statocyst to the apex. Outer uropod 

 nearly twice as long as the telson. 



Pleopods in the male typical for the genus; fourth pair (fig. 51, g) 

 with the exopod slightly longer than the endopod and terminating 

 in a long powerful plumose seta. 



Length of adult specimens of both sexes 8 mm. 



