360 Puget Sound Marine Sta. Pub. Vol. 1, No. 30 



B. Third pair of walking legs markedly longer and stouter than those 

 of preceding pair. pinnixa (p. 361) 



BB. Third pair of walking legs very little longer and stouter than those 

 of preceding pair. scleroplax (p. 362) 



Genus Pinnotheres 



KEY TO SPECIES 



A. Carapace soft; walking legs increasing in length posteriorly. 



1. P. ptigettensis 



AA. Carapace hard ; walking legs not increasing in length posteriorly. 



2. P. concharum 

 1. Pinnotheres pugettensis Holmes (not figured) 



"Carapace soft, smooth, subpentagonal. Front triangular, acute 

 curved downwards, scarcely protruding beyond the general contour of the 

 carapace. Orbits nearly circular. Antennae shorter than one-half the 

 width of the front. Maxillipeds very oblique, strongly pubescent; merus 

 narrower than in nudus, the outer margin convex; penultimate joint broad, 

 subquadrate, distally truncated, last joint minute, joined slightly in ad- 

 vance of the middle of the preceding one but scarcely reaching beyond the 

 tip. Chelipeds smooth ; merus short, the upper margin furnished with long 

 hairs; hands narrow, elongated, rounded, smooth, the dactyls and inner 

 side of the palm short, pubescent; fingers subcylindrical, nearly straight, a 

 little shorter than the palm, the tips strongly hooked, dactyl with a low 

 tooth near the base of the inner margin. Ambulatory legs slender, in- 

 creasing slightly in length posteriorly; propodi hairy above and below; 

 dactyls narrow, compressed, convex above, abruptly contracted near the 

 tip into a short, curved claw ; in the three anterior pairs the dactyls are 

 shorter than the propodi and leave the lower margin nearly straight; in 

 the last pair the dactyl is much longer than the preceding propodus, much 

 longer than the preceding dactyls, and has the lower margin concave. The 

 outer surface of the palm is brownish with light colored reticulations. 



Length of carapace, 10 mm.; length of first ambulatory legs 9.5 mm. 

 Width of carapace, 10.5 mm.; length of last ambulatory leg, 10.5 mm." 

 (Holmes, 1900.) 



Reported from Puget Sound region in the branchial cavity of Hals- 

 cynthia by Miss Rathbun. Found in the Friday Harbor region by Prof. 

 Kincaid. No specimens were found by the writer. 



