24 



U.S. NATIONAL MUSEUM BULLETIN 278 



Figure 11. — Caprella danilcvskii, female; a, abdomen; h, gnathopod 2; c, gnathopod 1; d, 



lateral view. 



with posion tooth at midlength, rectangular tooth distally; dactylus 

 less than one-half length of propodus; in females propodus with prox- 

 imal poison tooth and distal rectangular tooth; dactylus more than 

 one-half length of propodus. 



Gills 3 and 4 in males and 3 in females elliptical, long axis usually 

 parallel to body; gill 4 in females oval or elliptical. 



Propodus of pereopods 5-7 without distinct grasping spines, palmar 

 margin usually with numerous stout setae; grasping margin of dactylus 

 serrate. 



Abdomen of male typical of genus except for hooked papillae at 

 tip of appendage, female with small palplike appendage. 



Variation. — The shape of the gills is variable. In males the long 

 axis is usually parallel to the body; however, either or both may occa- 

 sionally be at various angles to the body. In the females either or both 

 of the gills may have the long axis parallel to the body or may be at 

 any angle. In small males the poison tooth on the propodus of gnath- 

 opod 2 may be more proximal than midlength; however, the dactylus 

 remains quite short. The palm of the propodus of pereopods 5-7 

 varies in setation from numerous stout setae to very few. 



