486 CL'ABS OF THE FAMILY LTTHODID^— BENEDICT. 



The rostrum is simple with two very small hasal s])iiies. Beneath 

 the rostral spine there is a swelling- where In L. tn idtispimis there is a 

 short spine. The eyes extend far beyond the basal spines of the ros- 

 trum, while in L. muUlfH)inns the spines extend much beyond the eyes. 



The chelipeds are much stouter than those of X. muliispiuMS, and the 

 fingers of both hands are more cur^'ed. 



The ambulatory legs are similar to those of L. nuiltispiuns, but the 

 f^pines are not so long and are broad at the base; the dactyli are com- 

 paratively shorter, stouter, and broader at the tips. 



Type.— 1^0. 1853G, U.S.KM., oft' Lower California ( ?). 



PRISTOPUS, now genus. 



The rostrum, antennal scale, and the character of the abdomen are 

 substantially as in Leptolitliodes. The legs are much compressed; the 

 anterior and posterior margins are set with shaip spines. In LeptoU- 

 tliodes the legs are angular, not at all compressed, and the spines are 

 arranged in rows on the angles or ridges. Paralomisformosus, Hen- 

 derson, belongs to this genus. 



PRISTOPUS VERRILLI, new species. 



The carapace is verrur^.ose, the areolations j)rominent. The gastric 

 region is much elevated and is surmounted by a small sjiine. On each 

 side, on the border of the branchial region, there is a deep pit. A 

 groove runs from the pits to the depression between the gastric and 

 cardiac regions. There are about twelve spines, two to three mm. in 

 length on the lateral border of the carai^ace. The posterior boundary 

 of the intestinal region is marked by a semicircular row of tubercles. 

 The cardiac region is triangular; the apex of the triangle cuts well into 

 the intestinal region where the depression that marks it runs into a deep 

 slit or oblong median depression. The frontal margin is l)road and 

 straight. The spines of the anterior angles and tlie orbital spines point 

 forward; the orbital spines are a little the longer. Between the spine 

 on the angle and the orl)it there is a row of smaller spines and one or 

 two granules. The tiispmose rostrum is composed of a bifurcate 

 rostrum proper and the subrostral spine which extends much beyond 

 the two upper rostral spines. The antennal scale tapers to a sharp 

 point and has three sliarp s])ines or branches on each side. The lateral 

 plates on the left of the abdomen in the female are fringed with short, 

 slender, blunt spines. 



The chelipeds extend a little beyond the middle of the propodal 

 segment of the first pair of ambulatory feet. The right chelii)ed is 

 stouter than the left. The prehensile edges of its fingers are strongly 

 tubercular. The upper margin of the palm is spiny; there are also 

 some small spines on the middle and on the lower margin. There are 

 three long spines on the inner margin of the carpus. The left cheliped 

 is similar but smaller, and thejn-ehensile edges of the fingers are sharp. 



