58 CRABS OF THE FAMILY INACHID.F—M. J. RATHBUN. vol.xvii. 



Measurements. — Leiiii'tli of carapace, 5.8 mm. ; width, 4.2; approxi- 

 mate length of cheliped, 6.5; of second ambulatory, 10.7; third, 9,5; 

 fourth 8. 



Locality. — Dredged off Eio Janeiro by Mr, Richard Rathbnn in the 

 Hartt explorations of 1875-'77. 



This species resembles I. ohtusus and I. hevis in its thick rostrum, but 

 it differs from all described species in its smooth dorsal surface, even 

 the cardiac region being without a tubercle, 



ANASIMUS LATUS, new species. 



Carapace almost as broad as long, elevated on the median line, the 

 posterior half semicircular in outline, the anterior half broadly trian- 

 gular. Surface covered with tubercles unequal in size. There are five 

 median spines; two gastric, the posterior the larger, one large on the 

 cardiac i egion, one very small and pointing backward on the intestinal 

 region, and one long acuminate spine directed backward at the distal 

 end of the first abdominal segment. The anterior gastric median 

 spine is oue of a transverse row of five. lu front of the extreme 

 spines of this row are two longer and sharper. On the branchial 

 region there are three small spines forming a triangle. There are 

 three antero-lateral spines, one ou fhe hepatic region and two on the 

 branchial region above the base of the cheliped. The rostrum is short, 

 sharp, triangular, and upturned. The supraorbital spines are promi-- 

 nent, separated by a deep depression. The postorbital spines are long, 

 exceeding the eye iu large specimens, much less conspicuous in small 

 sj^ecimens. The basal antennal segment is long and narrow, terminat- 

 ing in a spine, and with a stout spine in front of the eye pointing down- 

 ward and forward. The tlagellum is short, its second joint not attain- 

 ing the end of the rostrum. The pterygostomian region has a row of 

 spines and spinulcs which is continued to the antennal segment and 

 includes a long spine at the angle of the buccal cavity. The merus of 

 the maxillipeds is strongly cordiform as in A.fugax. Sternum and abdo- 

 men tuberculous. Abdomen of female with median tubercles on the 

 third and fourth segments. 



The chelipeds in the male are a little more than twice the length of 

 the carapace; ischium, merus, and carpus tuberculous; merus cylindri- 

 cal; propodus swollen, palm shorter than the pollex, with fine scattered 

 tubercles. Digits slender, curved inward, gaping at base only, their 

 fine regular teeth in contact. In the female the chelipeds are a little 

 longer than the carapace, are much smaller than in the male, and the 

 fingers touch throughout their length. Ambulatory legs all very long, 

 slender, cylindrical, armed except the dactyli with numerous small 

 appressed spines; propodi and dactyli with a double fringe of hair. 



Young individuals are narrower, with proportionally longer dorsal 

 •spines and rostrum and shorter ])ostorbital spines. 



