PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 425 



naked 5 the digits are similar, longitudinal, sliglitly longer than the 

 basal portion of tlie chela, compressed, slightly curved d<>T\'u\vard 

 toward the tips, but the prehensile edges straight and very minutely 

 serrate. 



The ambulatory legs are very nearly equal in length, and slightly 

 overreach the chelipeds ; the merus is about as long as the left chela, 

 and roughened with small spines on the upper and under edges ; the 

 propodus is shorter than the merus, compressed, smooth, and ciliated 

 along the edges ; the dactylus is a little longer in tbe second than in the 

 first pair, but in both shorter than tbe propodus, very strongly com- 

 pressed, very slightly twisted, about ten times as long as broad, and 

 thickly ciliated along both edges, except for a short distance along the 

 lower edge near the tip. 



The female is smaller than the male, and has proportionally shorter 

 ambulatory legs, and chelipeds verj^ much shorter and much more alike. 

 The right chela is only about a third longer than the carpus, little more 

 than a third as broad as long, and the digits are slender and nearly as 

 long as the basal portion. The left cheliped is proportionally stouter 

 than in the male, and thus approximates to the right; the chela itself is 

 scarcely more than a third longer than the carpus. The ambulatory 

 legs overreach the chelix)eds by nearly or quite the full length of the 

 dactyli, but all the- segments have very nearly the same relative propor- 

 tions as in the male. 



The eggs are few in number and very large, being about a millimeter 

 in diameter in alcoholic specimens. 



In young males the chelipeds and ambulatory legs are similar to those 

 of the female. 



Measurements. 



cT cf I ? 



(Sta. 877).' (Sta. 878.) (Sta. 878). 



Lcnstli from front of carapax to tip of abdomen 



Length (if carapax alung meilisiii line 



Leugtli of carapax from front to cervical suture 



Bread! h of carapax iu front 



Length of eye-st.ilk.s 



Greatest di;iiaeler of eye 



Length of pc ilundo ot antennula 



Length of ultimate segment of the same 



Length of peduncle of antenna beyond front 



Length of ultimate segment of peduncle of antenna 



Length of right cheliped 



Length of caii)ns 



Lengtli of proiiudus 



Breadth of propddus. 



Length of tlactylus 



Length of left cheliped 



Length of carpus 



Length of projiodus 



Breadth of propodus 



Li'Ugth of daclyius 



licngth of lirst am l)ulatory leg, right side 



Length of i>roi)o(his '. 



Length of daelvhis 



Lengi h of second ambulatory leg, right side 



Length of propodus 



Length of dactylus 



mm. 

 IG.O 

 5.0 

 4.0 



2.5 

 1.7 

 5.1 



2.2 



;!.4 



1.7 



13.5 

 4.0 

 5.4 

 1. !) 

 2.8 



10.1 

 4.0 

 5.1 

 1.3 

 2.8 



21.0 

 5.2 

 .5.0 



21.5 

 5.8 

 6.0 



