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



AA. Rostrum short, broad. 



C. Merus of walking legs long in some, not distinctly flat, not distinctly 

 broader near base. 

 D. Carapace (with rostrum omitted) sub-rectangular. 



E. Carapace smooth ; postocular spine not prominent. 



EPIALTUS (p. 369) 

 EE. Carapace not smooth but tubercled ; postocular spine more 

 prominent. pugettia (p. 370) 



DD. Carapace (with rostrum omitted) not sub-rectangular. 



F. Rostral horns not convergent. scyra (p. 371) 

 FF. Rostal horns convergent. hyas (p. 371) 



CC. Merus of walking legs long, quite flat, distinctly broader near base^ 



CHIONECETES (p. 372) 



Genus Chorilia 

 1. Chorilia longipes Dana. (fig. 24) 



Hyastenus {Chorilia) longipes Miers; Hyastenus japonicus Miers. 



"Carapace pyriform, inflated and covered with sharp spines of un- 

 equal size. Median region tumid, with two median spines and a row of 

 three spines on either side, the posterior one being the largest and situated 

 a little behind the middle of the interval between the two spines on the 

 middle line ; a prominent spine on the tumid hepatic region ; several small 

 spines on the cardiac region and a small spine or tubercle near the 

 posterior end of the intestinal. The spines on the branchial regions are 

 iiumerous and variable, but there is usually a more prominent spine near 

 the middle. Pterygostomian regions with a row of teeth or spines. 

 Rostrum long, the horns nearly straight, pubescent and divergent. Pre- 

 orbital spine prominent, acute, postorbital acute and pointing obliquely 

 downwards. Basal antennal joint armed at its external angle with a 

 slender spine, the margin behind which is armed with two smaller spines. 

 There may be a few minute spinules at the apex of the eyestalk. Merus 

 of the chelipeds furnished with small tubercles, which are more promi- 

 nent on the angles ; carpus furnished with small tubercles on the outer side^ 

 Avhich are more or less plainly arranged in 3 or 4 rows; hands long, 

 slender, compressed, palm sub-carcinated above, nearly smooth and gen- 

 erally having a small tubercle on the outer side near the articulation ; fin- 

 gers long and slender. Dactyls of the slender ambulatory legs long and 

 nearly straight. Abdomen of the male tapering from the third segment, 

 the last jont longer than broad and rounded at the tip. Abdomen of the 

 female broadly elliptical, the joints increasing in length from the third 

 to the last. In some females, either immature or sterile, the abdomen 

 is narrowly elliptical and not nearly so wide as the thoracic sternum. The 



