Stiulies in Lagmia Amphipoda. 



647 



Orchestoidea corniciilata n, s/>. 



(Compare Figs. A— C.) 



Body smooth. Side-plates of good size, the fifth neither so wide 

 nor deep as the fourtli. Eyes of moderate size, black, reniforra, 

 rather wide apart. Antenna 1 reachiiig- about to the middle of the 

 penultimate Joint of antenna 2; flagellum 4-joiuted, shorter than 

 pednncle. Antenna 2 in the male freqiiently approaching half the 

 length of the body; in the female usnally about one fourth the 

 length of the body; the peduncle much louger than the 14 — 18-jointed 

 flagellum. Mouth parts normal. Gnathopod 1 of the male, spinöse; 



Fig. A. Orchestoidea californiana (F. Brandt). 



fifth Joint with small, triangulär, apical process on bind margin; 

 sixth Joint shorter, narrow and without palm. Gnathopod 1 of the 

 female sirailar but without the apical process on the bind margin 

 of the fifth Joint. Gnathopod 2 of the male with small fifth Joint; 

 large sixth, palm oblique, spinöse, with prominent transverse process 

 extending about one third of the distance from the finger to the 

 apex; finger large, strongly curved, with apex touching groove in 



