348 CRUSTACEA. 



The hands of the second pair in female Orchestiae, have an oblong 

 elliptical, ovate, or spatulate form, with a rounded apex. The finger 

 is minute, and is more or less lateral in position, being articulated 

 with the dorsal margin, and seldom reaching when closed as far as 

 the extremity of the hand. Rarely, the finger is terminal, and then 

 it is oblique from above outward, in the species examined. In some 

 cases the hand is deeply emarginated below the finger ; and the posi- 

 tion of the closed finger may be either longitudinal or nearly trans- 

 verse, and the latter even when remote from the extremity. The 

 lower margin and adjoining part of the lateral surface of the hand? 

 has a minutely scabrous surface, besides having some short hairs near 

 the limits of this rasp or scabrous part. The preceding joint in its 

 lower projecting part is in general similarly scabrous, and often also 

 a corresponding part of the joint next preceding. The first pair of 

 legs in the same females, has usually a still smaller size. The hand 

 has a truncate extremity in most species, and the finger is articulated 

 with the apex. The lower part of the outer and the under surface is 

 often scabrous, like the same in the second pair, and the two preceding 

 joints may have a similar character in this respect. 



The large hand in the males (second pair) is commonly ovate, or 

 triangulato-ovate, the triangular form arising from an oblique trun- 

 cation of the margin for the finger to close against. This margin we 

 call for convenience in description the palm of the hand. It is often 

 spinulous and sometimes emarginate or dentigerous. The carpus 

 (fourth joint) in these legs in the Orchestiae, is very small, and 

 never extends downward between the hand and the third joint; so 

 that the third joint is contiguous anteriorly with the lower back 

 margin of the hand. This is not true, however, of all Allorchestes. 

 The articulation of the carpus with the preceding joint is longitudinal 

 in both sexes, and approximately so, in the legs of the first pair. 



The stylets have one and the same arrangement throughout the 

 species of Orchestidae. The two anterior pairs have two subequal 

 branches, which are furnished with a few setae or spinules along the 

 upper side, and four or five unequal spinules at apex. The second 

 pair projects less far than the first. The last pair is extremely short, 

 and consists of a stout base and a very small terminating joint. At 

 apex there are a few minute spinules, and often others on the upper 

 margin towards the extremity. 



The epimerals are seldom shorter than their width, and often are 



