OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 



207 



iagnosis. — Carapace narrow, widest at the antepenult tooth of 

 lateral margm; tubercles prominent. 



Description. — Carapace slightly broader than long, almost circular 

 exclusive of the posterolateral limb, which has a subrectangular out- 

 line. Two well marked grooves form the lateral boundaries of cardiac 

 and gastric regions. Tubercles of carapace conical, disposed as 

 follows: Gastric region with two large median and two smaller lateral 

 in advance of these, and about 18 very small tubercles; cardiac with 

 one central larger surrounded by six smaller; branchial region Avdth 

 about 15 large and more than that number of small; intestinal region 

 with six in two lines diverging posteriorly; hepatic region with five or 



Figure ii.—Calappa saussurei, male holotype: Dorsal view, 20.5 mm long. 



six very small depressed tubercles. Surface of tubercles densely gran- 

 ulate; surface between them covered with isolated granules. Margins 

 of front slightly rimmed. The lateral border has five or six denticles 

 on hepatic region, about six larger ones on branchial region ; branchial 

 expansion with five lateral teeth increasing successively in size, the 

 third and fourth most produced outwardly, and three posterior teeth 

 diminishing in size toward median line; posterior margin with a 

 shallow tooth at each end. 



Chelipeds with many large tubercles, irregular in size and disposition 

 and the intervening space covered but not crowded with granules; 

 tooth at proximal end of manus triangular; outer tooth of merus 

 bifid; fingers coarsely granulate. 



Measurements. — Male, holotype, length 20.5, width at middle 

 23.6, greatest width 24.4, width at posterolateral angles 22.9 mm. 



Range. — Gulf of Cahfornia, Mexico, to Ecuador; 7 to 150 fathoms. 



Material examined. — See table 67, page 209. 



