IS I»K. W. T. CALMAN ON A COLLECTION OF 



posterior direction, while the posterior part is flat, rrom side to side, in the line of the 

 lateral teeth, the surface is only slightly convex. The strongly deflexed front is divided 

 by a rather deep incision into two rounded lobes, and the outer angles form sharp 

 downwardly directed teeth, not visible from above, separated by a groove from the 

 supra-orbital angle. The upper margin of the orbit is interrupted by two short open 

 fissures, and a third is present on the lower margin just below the external angle. The 

 external angle of the orbit is not very prominent, rounded, and produced backwards for 

 a short distance as a slight ridge above the level of the first antero-lateral tooth. The 

 antero-lateral margin is equal in length to the postero-lateral, and is cut into four thick, 

 bluntly rounded teeth, increasing in length from before backwards, covered with fur 

 intersjjersed with granules. 



The flagellum of the antenna is nearly one fourth the length of the carapace. 



The ridges of the palate are distinct but not very prominent, and become obsolete before 

 reaching the front margin of the buccal frame. 



The chelipeds are very unequal ; the merus is short, trigonous, the upper margin 

 carrying a large rounded tooth separated by a narrow incision from the projecting 

 rounded distal angle ; the carpus has on its convex outer face scattered granules, 

 l^artly arranged in oblique lines and interspersed with fur, and a transverse groove 

 runs parcillel to the distal margin ; the hand of the larger cheliped (the right) has the 

 palm but little longer than broad, with longitudinal rows of granules nearly hidden 

 by the fur on its outer face ; the fingers are stout, aliout one-half the length of the 

 palm, with blunt rounded teeth on the inner edges ; the dactylus has a patch of 

 granules and hairs at its base, and both fingers are slightly grooved. In the smaller 

 hand the granules on the outer face are less regularly arranged in rows. 



The ambulatory legs have the merus wdth a sharp crest on its upper edge, rising 

 gradually with a straight edge towards the distal end, where a narrow notch separates 

 it from the prominent rounded distal tooth. In the first three pairs the anterior and 

 posterior faces of the merus are smooth and nearly free from hair. In the last pair of 

 legs the jjosterior face of the merus is closely furred. The carpus and propodus of all 

 the legs are considerably expanded and flattened, covered with fur rather longer than 

 that on the carapace, and the carj)us has a deep longitudinal groove on the anterior and 

 posterior faces. The dactylus of all the legs is stout and nearly cylindrical. The 

 abdomen (female) has all seven joints free. 



The form described above differs from all the species of Pilumnus known to me in the 

 crested merus of the ambulatory legs, the feebly developed endostomial ridges, and the 

 blunt teeth of the antero-lateral margin. In the first two of these characters it aj)proaches 

 the P. dilai/pes of Adams & White (Zool. Voy. ' Samarang,' Crust, p. 4i, pi. ix. fig. 4), 

 for Avhich Miers has proposed to constitute a separate genus Lophopilmniius (Rep. Chall. 

 Brachyura, p. 148) ; but in that species the antero-lateral teeth are broad and denticulated 

 and the meral crests are of very dilferent shape and are not divided by a notch near the 

 distal end. In the great convexity of the anterior portion of the carapace the species 

 has some resemblance to an Actumnus, in which genus, however, the carapace is not 



