CORYSTOIDEA. 303 



long as the joint, while they are half as long as the joint in Krauss's 

 figure. The apex of the peduncle of the eve has two or three minute 

 spinules or points. The penult joint of the female abdomen is nearly 

 rectangular and rather longer than broad, each joint excepting the 

 first and last has two tufts of long hairs, those of the second joint are 

 in part reversed, and as long as the first and second joints together. 

 The sternum is very narrow. The orbit has an emargination at its 

 outer angle, and on the upper side of the peduncle of the eye adjoin- 

 ing the cornea there is a short spine, less acute and shorter than in 

 Krauss's figure. 



Platyonychus, rugulosus, Krauss, Siidaf. Crust., p. 26, PL 1, f. 5. 

 Trichoceraporcellana? A. White, Voy. Samarang, p. 59. 



Genus TELMESSUS, White. 

 Telmessus serratus, White. 



Plate 18, fig. 8 a, b, c. 

 Puget's Sound. G. Pickering. 



The form of this species is very closely as represented in White's 

 figure (Crust., Voy. Samarang, PI. 3). The front between the eyes 

 projects and is three-lobed, the two outer lobes triangular and sub- 

 acute, the inner a little more prominent, and with four small denta- 

 tions at apex. The dorsal view on the Plate referred to, appears to re- 

 present the middle lobe of the front as in our specimen, but not so the 

 under view (fig. a, of White) . The outer antennae project either side of 

 the median lobe. The antero-lateral margin is coarsely four-dentate; 

 teeth triangular and partly with spinulous margins ; posterior tooth 

 (S) largest. The line between the teeth crosses the carapax much 

 behind the middle of the carapax, the anterior and posterior part 

 having nearly the proportions in length of 8 to 5. The breadth along 

 the line between these teeth in one specimen is seventeen lines, and 

 length of carapax, fourteen lines. The postero-lateral margin has two 

 prominent teeth, the posterior of the two much the smaller. 



The position and size of the base of the outer antennae, as well as 

 the short epistome and general form, lead us to believe that the 



