NO. 1162. BRACHYURA COLLECTED BY THE ALBA TROSS—BA THB UN. 607 



to the end of the carpus of the third pair; the propodus is narrow, as 

 in the first and second pairs. 



Dimensions. — Female: Length, 3.4 mm.; width, 7.3 mm. 



Type. — No. 21594, U.S.N.M. One female, with eggs. Panama Bay, 

 26 fathoms, station 2803. 



129. PINNAXODES HIRTIPES Heller.' 

 (Plate XLIII, figs. 10, 11.) 

 Pinnaxodes hirtipes Heller, Keiso Xorara, Crust., 1865, p. 68, pi. vi, tig. 2. 



Port Otway, Chile; one male. 



This specimen agrees fairly well with Heller's description and figure, 

 but it seems to me that this species is distinct from P. chilensis (Milne- 

 Edwards) with which it has been united. In the Alhaiross specimen, 

 which is the only one that 1 have seen, the carapace is very convex, 

 broader than long, thin, but not soft and yielding, without the longitu- 

 dinal sulci from the orbits, as figured in P. chilensu by Milne-Edwards 

 and Lucas. On either side of the gastric region there is a very short 

 longitudinal groove or dent (about half a millimeter in length). The 

 second segment of the abdomen is more than twice as long as the first. 

 The abdomen tapers regularly from the third to the fifth segment, 

 inclusive; the sixth has concave lateral margins. The last three seg- 

 ments of the maxillipeds resemble those figured by Ileller. The under 

 surface of the body and also the legs are pubescent; and the latter 

 are margined with long hair. The fingers of the chelipeds are wide 

 and very little gaping. The ambulatory legs are narrow, much like 

 those figured by Heller, but the meri are proportionately longer, which 

 may be due to the difference in sex. 



Dimensions. — Male: Length, 7mm.; width, 7.G mm. 



TETRIAS, new genus. 



Carapace transverse^ hard; palpus of maxilliped with joints end to 

 end; ambulatory legs of the second pair the longest. 



Carapace transverse, subquadrilateral, with anterolateral angles 

 rounded; high, sides steep; posterior two-thirds flattened, anterior 

 third deflexed. Abdomen of adult female suborbicular, at base only 

 half the width of the sternum, tip advanced as far as the extremity 

 of the ischium of the maxillipeds. Maxillipeds very large, with the 

 ischium well developed, the merus enlarged at its middle; propodal 

 joint oblong, broadening at the distal end; terminal joint similar and 

 attached on the inner portion of the distal margin of the preceding. 

 Chelipeds stout; fingers longitudinal. Ambulatory legs diminishing 

 from the second to the fourth pair, which is very small ; first and third 

 pairs subequal. 



This genus resembles Parapimiixa, Pinnaxodes, and PinnothereUa in 

 having the maxillipeds with a palpus of three joints placed end to end. 



