CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 85 



who compares it with T. admete, to which species Dana's crab ap- 

 proximates much more closely than that of Riippell. 



The German naturalist seems to have priority in the use of the 

 term crenata, for, although he refers to Latreille for the name, we 

 can nowhere find a description by the latter author. 



129. THALAMITA DAN^E Stimpson 



Plate XI, Fig. i, la 



Thalamita crenata Daxa, U. S. Exploring Expedition, Crust., i, 282, pi. 



XVII, fig. 7. 

 Thalamita dance Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 39 [37], 1858. 



Easily distinguished from T. crenata by the granulous and costate 

 outer surface of the hand and the more deeply cut teeth of the front. 

 It approaches more closely T. crassiviana Dana (prymna De Haan). 

 The crest of the basal joint of the antennae projects beyond the 

 frontal margin. 



Color in life dark purplish-red or brick-red above, much lighter 

 below. 



Found under stones on coarse sandy ground, above low-water 

 mark, in the harbor of Hongkong, China. 



130. THALAMITA PICTA Stimpson 



Plate X, Fig. 5 



Thalamita pic fa Stimpsox, Proc. Acad. Nat. Sci. Phila., x. p. 39 {3-]. 185S. 



This is a small, prettily-colored species, of which two specimens 

 only were obtained. The proportion of length to breadth in the 

 carapax of the male is 1:1.58. Upper surface pubescent and 

 marked with transverse raised lines arranged as in T . dance, the lat- 

 eral lobes of the anterior set of lines on the gastric region being 

 behind the median ones, and not in the same range as in T. crassi- 

 mana. Antero-lateral margin a little oblique, five-toothed, including 

 the angle of the orbit, the fourth tooth much smaller than the fifth, 

 which nearly equals the third in size. Frontal margin a little promi- 

 nent at the middle and deeply crenated. with six lobes (excluding the 

 praeorbital teeth), the median two lobes small and rounded, the next 

 ones broad, the external ones small and pointed. Basal joint of ex- 

 ternal antennae with a short, sharply compressed, smooth-edged 

 laminiform crest, the middle portion of which projects beyond the 

 front. Chelopoda squamose and pubescent above ; spines nearly as 

 in T. dana: spine at inner angle of carpus very long; hand costate 



