152 



BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



bristles of even length which bend forward and are enlarged at the 

 end. Regional furrow^s deep. Denticles of the front often wanting 

 in old worn specimens. Inner supraorbital tooth triangular, its 

 anterior end forming a right angle. Lateral teeth six including the 

 outer orbital tooth; fourth tooth much the largest, situated at the 

 lateral angle; the post-lateral teeth are the smallest, especially the 

 hinder one; margins of all the teeth armed with stout acute denticles 

 which are apphed against the upper surface along the posterior 

 margins but are larger and project forward normal to the anterior 

 margins. 



The chelipeds are granulate and hairy, the granules ranged in 

 longitudinal rows on chelae. The merus has three nearly equal 

 surfaces; the carpus has a groove along its outer distal margin, its 

 inner angle is produced in a long flat spine. Fingers deeply grooved, 

 prehensile edges armed with stout tuberculiform teeth. Ambulatory 



Figure 22.— Telmessus cheiragonus. a. Female abdomen and sternum, b. Epis- 

 TOME. c. Bristle from carapace, enlarged. After Benedict 



legs much compressed and bearing short transverse lines of granules 

 bearing coarse bristles; the dactyls have horny tips, two longitudinal 

 grooves on each side and one groove above which is bordered on 

 either side by two rows of small spinules and a fringe of bristles; a 

 double row of spinules with accompanying bristles on the lower 

 margin. 



Color. — Yellowish with purple spots (Steller). 



Measurements. — Male (47965), length of carapace 83.5, width of 

 same 97, fronto-orbital width 54, width of front at base, between 

 antennae, 21.3 mm. 



Range. — Off northern California (Stimpson) to Bering Sea and 

 southward from Siberia to Japan. 



Material examined. — 



WASHINGTON.— Port Orchard, Puget Sound; July, 1889; O. B. 

 Johnson; 6 males, 11 females (14965). 



