



CRUSTACEA COLLECTED IX PUGET SOUND, N.A. 283 



wider and truncate at the tip, which is setose. 

 This member is very like that of a Podocerus. 

 The two pairs of antennae are of equal length. 



3. The last two pair of perseopoda are of equal 



length. 



4. The last pair of uropoda scarcely projects beyond 



the second pair. 



Mceroides thompsoni* n. sp. PI. XVI., figs. 3 — 6. 



Two males. Length 10 mm. 



Head, lateral angle acutely lob ate. 



Body, coxal plates of the three anterior segments about 

 as deep as the body, margins smooth and rounded ; third 

 pleon segment with the posterior and lower margins 

 convex, the latter with a single tooth some distance in 

 front of the posterior angle, which is sub-acute ; fourth 

 and fifth pleon (1st and 2nd urosome) segments with two 

 teeth on their posterior margins, a seta at the base of 

 each lateral tooth. 



Eye large, dark, long-oval, running into the lateral lobe. 



Upper antennae, 1st and 3rd joints of equal length, the 

 2nd nearly twice as long ; the flagellum about as long as 

 the peduncle ; accessory appendage 7-jointed. 



Lower antennae as long as the upper, i.e., about half 

 the length of the body, the peduncle and flagellum also 

 being sub-equal; last joint of peduncle the longest. 



First gnathopod, 1st joint as long as the carpus and 

 longer than the propodos, which is oval and setose. 



Second gnathopod very powerful, the 1st joint longer 

 than the carpus or propodos, the anterior margin of the 

 latter rather longer than the former ; the margins of the 

 propodos almost parallel, the anterior slightly concave ; 



* Xamed after my friend and fellow-worker in the Crustacea, Mr. Isaac 

 C. Thompson, F.L.S., of Liverpool. 



