534 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



11 olotype.— Large female. Cat. No. 47305, U.S.N.M. 



Measurements. — Length of carapace to tips of rostral horns, 63.3 ; 

 to rostral simis, 53.7 ; width of carapace, spines excluded, 60.7 ; length 

 of lateral gastric spine, 22 ; length of cheliped, 140 ; length of maniis 

 (upper margin), 39; greatest width of manus, 8.3; least width of 

 manus, 5.8; length of first leg, 260; of second, 205; of third, 175; of 

 fourth, 172. 



The roughest species of Cyrtomaia known. Carapace covered with 

 spines and spinules. Of the larger spines the gastric pair are by far 

 the longest; they are very slender, slightly arched, and are directed 

 forward in a plane nearly parallel with that of the rostral horns. 

 The posterior median gastric spine and two spines on each branchial 

 region of about the same size form an irregular transverse line. Of 

 equal length is the spine at the outer angle of the orbit. The two 

 cardiac spines are nearly as long. Lesser spines though of fair size 

 are: One on each of the postero-lateral margins of the rectangu- 

 lar gastric field, one median almost in the middle of that field, one on 

 the posterior part of the branchial region, and of the hepatic region. 

 Of the smaller remaining spines there are many conspicuous ones 

 below the gastric pair and a row above the branchial margin at the 

 widest part of the carapace; of this size is the spine on the upper 

 margin of the orbit and the one on the intestinal region. Two still 

 smaller spines are on the posterior margin of the carapace either side 

 of the middle. A prominent ridge runs from the long gastric spine 

 to the hepatic region, thence to the inner hepatic spine. There is a 

 spinule on the margin of the inner orbital lobe. The rostral horns 

 are slender, a little longer than the interantennular spine, and are 

 widely separated at base and slightly divergent. 



Eye-stalk rather slender, bearing a bilobed tubercle near the ex- 

 tremity. Basal segment of antenna armed with 4 or 5 slender spines ; 

 the second spine from the distal end is near the inner margin; the 

 two movable segments of the peduncle have a few minute spinules. 



Chelipeds (of female) armed with numerous slender spines, the 

 longest of which are in two rows bordering the inner surface of the 

 merus, in the inner row on the upper border of the manus and in 

 the outer row of the lower border. Gape of fingers narrow, confined 

 to proximal half ; prehensile teeth low. 



First and second pairs of legs strongly armed, the longest spines 

 forming a double comb on the propodus and dactylus of the first 

 pair. Last two pairs furnished with a few small spines, scattered on 

 all the articles of the third leg except the dactylus, but confined in 

 the fourth leg to the proximal half or two-thirds of the merus, with 

 a spine or two on the carpus. In all the trunk legs the distal spine 

 on the merus is long and there is a spine on the ventral surface of 

 the coxa. 



