622 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



distal joint is cylindrical and as long as the two preceding; the flagelluin 

 is composed of nine nearly equal segments, the outer ones of which 

 are very slightly longer. 



The front is armed with three prominent teeth with pectinate edges. 

 The rostral tooth has concave edges, running back to a point at the 

 outside of the e3'estalk, where it meets the inner edge of the lateral 

 tooth, running nearly parallel to the median line; this makes the figure 

 of a broad W, the oviter lines of which are almost parallel. The outer 

 margin of the lateral teeth does not cut back as far as the inner mar- 

 gin, but unites with the margin beyond, which ends in a deep sinus 

 formed by the forwardly directed antero-lateral spine. The small 

 spines which form the comb of the frontal margin are more crowded 

 in the W ; the terminal spines of the three frontal teeth are the largest. 

 Outside of the lateral tooth the little spines are more scattered, becom- 

 ing smaller near the sinus at the antero-lateral angles. Behind the 



gastric region there is a deep bow- 

 shaped groove, which extends nearh' to 

 a ridge which runs from the side upon 

 the branchial nearly to the gastric re- 

 gion. In front of this is a transverse 

 ridge, with a depression in front which 

 is slighth' sigmoid in shape. The outer 

 end of this ridge ends in a sharp spine. 

 Behind the cardiac area is another im- 

 pressed line of the same shape as the 

 one behind the gastric area, but with 

 more pronounced curves which extends 

 nearly to the sides. 



The anterior portion of the larger 

 specimen and the greater part of the 

 carapace and chelipeds is well preserved. The abdomen and ambu- 

 latory feet are detached and in bad condition. Width of carapace 

 between antero-lateral spines, 13 mm.; eyestalks, 3 mm. long; distance 

 from the apex of the rostral tooth to the posterior line of the gastric 

 area, W mm. ; width of the carapace of the second specimen between 

 points of antero-lateral teeth, 6 mm. ; width of carapace of smallest 

 specimen between points of antero-lateral teeth, 4: mm. 



The surface of the gastric area is evenly and coarsely granular in 

 front. The posterior middle part has numerous short raised lines 

 clothed with short hair. The posterior portion of the carapace has 

 longer lines with little depressions in front. These raised lines sup- 

 port a series of granules and numerous short hairs. The postero- 

 lateral sides are armed with short, sharp, conical teeth crowded 

 together, the points of each of which are directed forward. The hands 

 of the anterior feet are more like those of Albunea and Lepidopa than 



Fig. 1. — LOPHOMASTKIX DIOMED^. I 



front; b, antennae; c, maxii.liped. 



