DECAPODS 155 



Eyes reaching nearly to end of first antennular segment, oblong, more 

 than twice as long as wide; sides subparallel; antero-extemal angle 

 rounded ; antero-internal angle produced in a tuberculiform tooth, these 

 teeth being slightly divergent from each other; eyes without pigment. 

 First segment of antennular peduncle longest ; second segment stouter, 

 and a little shorter, than the third ; flagella subequal and less than twice 

 the length of peduncle. The antennal peduncle overreaches the antennu- 

 lar by the length of the last and one third of the preceding segment ; the 

 penultimate segment is twice as long as the antepenultimate and one and 

 a half times as long as the ultimate ; the flagellum is nearly as long as the 

 body. The ischium and merus of the outer maxillipeds, while wider than 

 the succeeding joints, are not very broad ; the ischium has a lobiform 

 opercular dilatation on its inner or lower margin ; dactylus almost circular. 



The chelipeds are very unequal ; the larger one is equal to the cara- 

 pace and first four abdominal somites combined ; the ischium has a few 

 minute spinules at the proximal end of its lower edge ; the merus may 

 have a small spine at the proximal end of its lower margin, or it may (as 

 in the largest specimen) be devoid of armature; the carpus is nearly 

 twice as deep as it is long and one half as long as the palm ; its lower 

 angle is rounded ; the palm is a litde longer than high, and subequal in 

 length to the dactylus; its distal lower quarter has a few tubercles 

 irregularly disposed, from which proceed bunches of hair. The lower 

 margin of the ischium, merus, and carpus, and both upper and lower 

 margins of the manus are carinated. The dactylus is longer than the 

 pollex ; the upper surface is very broad and has a rounded carina on the 

 inside and the outside ; the outer one is tuberculate near the base of the 

 finger ; the outer margin of the cutting surface has a broad tuberculated 

 tooth near the palm, and a lobe near the tip ; the inner margin of the 

 cutting surface is tuberculate along its distal half ; the pollex has a stout 

 tooth on the upper edge. The fingers gape widely in the male, not at 

 all in the female, and are beset with bunches of long hair. 



The smaller cheliped is one third as wide as the larger and reaches 

 only to the distal third of the palm of the larger. The ischium and 

 merus are similar to those of the larger cheliped ; the carpus is longer 

 than high, lower angle subacute. The palm is a litde shorter than the 

 carpus, longer than wide. Dactylus slender, nearly twice as long as the 

 palm and longer than the pollex, which is armed with a single sharp 

 tooth at its proximal third ; the fingers do not gape, as they overlap far 

 from the extremities. 



The second, third, and fourth pairs of legs are stout and compressed, 

 and increase slightly in length in the order named ; the fifth pair is as 



