INACHIDAE. 73 



Scyramathia cornuta (Rathbun). 

 Auamathia cornuta Rathbun, Troc. U. S. Nat. Mus., 1898, 21, 571, pi. 41, fig. 2. 



Ten miles from Hood Id., Galapagos; 633 fath., station 4641; Nov. 7, 

 1904; 1 <?. 



Scyramathia vesicularis, sp. nov. 



PI. 5, Fig. 7 ; PI. 8, Figs. 1, la. 



Body and legs everywhere covered with a pubescence formed of spherical 

 vesicles; a few long, slender hairs on the gastric region, the lateral margins, 

 and the rostrum. Carapace armed with eighteen short, stout, and pointed 

 spines, of which four are on the gastric region, one is on the cardiac, one on 

 the intestinal region, four on each branchial region, one on each hepatic 

 region, and one above each eye ; in addition, the post-ocular lobe is narrow, 

 curved, and acute. 



Rostrum composed of two slender divergent horns f- the length of the 

 rest of the carapace. 



Eyes visible even when retracted against the post-ocular lobe. 



The narrow basal antennal joint has an antero-external spine, and two 

 spines further back on the outer margin; flagella situated outside the rostrum. 



Ischium and merus of outer maxillipeds with a concave surface. 



Chelipeds (of <? ) just as long as the carapace and rostrum and little 

 stouter than the other legs ; arm with four short spines above, which increase 

 distally ; wrist with three or four similar spines ; palm with sides parallel, 1^ 

 x as long as the fingers, which meet when closed. 



Merus of all the ambulatory legs with a spine or tooth at the distal end. 

 1st pair H x as long as carapace and rostrum. 



In the ? the rostrum is shorter, J length of remainder of carapace ; the 

 cheliped = length of carapace and half the rostrum ; the fingers are rela- 

 tively longer than in the <? ; 1st pair of ambulatories 1| x as long as 

 carapace and rostrum. 



Dimensions. — S type, length 20.7 mm., width 11.5 mm., rostrum 6 mm. 



Type locality. — S. E. of Hood Id., Galapagos, 300 fath., station 4642; 

 Nov. 7, 1904 ; 1 $ (type) 3 9 (2 gravid) Cat. No. 32,860, U. S. N. M. 



This species in its numerous spines resembles S. pulchra (Miers), 1 from the 

 Philippines and Andaman Sea, 130 to 561 fathoms, but differs from it in the 

 arrangement of the spines and the shorter legs. 



1 "Challenger" Brachyura, 1886, 17, 26, pi. 4, fig. 1. 



