Miscellaneous. 73 



to the extremit)'. Postfrontal crest short and inconspicuous or 

 wanting. Lateral raargins spinous. The merus of the maxillipeds 

 is transverse, the antero -external angle rounded, the palpus articu- 

 lating at the internal angle, which is very slightly notched. Cheli- 

 peds with a row of spines on the anterior margin of the carpus. 

 Ambulatory legs with margins spinous. 



Erimetopus sinnosus, sp. n. 



Carapace about four fifths as long as broad, convex longitudinally, 

 postero-lateral margins long, sloping slightly inward and backward, 

 antero-lateral margins arcuate. The cardiac region and the poste- 

 rior portion of the gastric region are outlined by shallow depressions. 

 Front about one third the width of the carapace, advanced, two- 

 lobed, lobes separated by a broad V-shaped sinus. ITargin of front 

 and orbits granulous. Orbits well-defined, the outer angle a sharp 

 incurved spine. There are two protogastric lobes, little elevated 

 and often not discernible, except by two transverse lines of a lighter 

 colour. A very shallow median groove extends backward from the 

 frontal margin and forks directly behind the protogastric lobes. 

 The postfrontal crest, when present, is short, arcuate, tuberculous, 

 and indistinct ; it begins back of the cornea, and for a short distance 

 is nearly straight, directed outward and slightly forward, then 

 curves almost parallel to the antero-lateral margin. In most speci- 

 mens, however, the crest is obsolete, indicated only by the smoothly 

 rounded elevation behind the orbit. Antero-lateral margin with a 

 row of from five to eight spines next the orbit, of which the orbital 

 spine is the largest. The spines are irregular in size and po-^ition. 

 On the anterior branchial region are five or more marginal spines 

 separated by a space from the hepatic spines ; the anterior is by far 

 the larger and is sometimes bifid. The others decrease in length 

 posteriorly. The suborbital margin is granulous except at the notch 

 beneath the postorbital spine. The abdomen of the female covers 

 the sternum. 



Chelipeds in the female unequal. The margins of the merus are 

 spinulous, the upper margin with a sharp spine near the carpus, the 

 inner surface tuberculous at its base, the lower surface with a 

 transverse tuberculous ridge at its distal end. The carpus has two 

 strong spines on its inner margin and a row of about seven smaller 

 spines on the anterior margin, two of which are close to the condyle 

 of the manus and are separated by a wide interval from the 

 remaining spines. Sometimes one of the spines is bifid, and occa- 

 sionally additional spinules occur on the upper surface behind the 

 marginal spines. The manus is slightly swollen, with a convex 

 lower margin and almost straight upper margin, which sometimes 

 in the smaller eheliped has a small sharp spine at the distal end ; in 

 a few specimens there are one or two spines at the proximal end. 

 Fingers irregularly dentate on their prehensile edges and slightly 

 gaping. The ambulatory legs are rather broad, flattened ; meral 

 joints with two spines at the distal end ; carpal and propodal joints 

 strongly spined above ; carpal joints with distal spines in the first 

 pair and often in the second and third pairs ; propodal joints with 

 a few spines below ; dactyli with four rows of spines. 



