REPORT ON THE ANOMURA. 165 



lateral margiu behind the autenual peduncle ; the posterior margin is raised and pro- 

 minent, but unarmed. 



The chelipedes are short and robust, with the joints pubescent and finely granulated ; 

 a few short conical spines are also present at the distal end of the ischium, merus, and 

 carpus. The propodus is about twice the length of the carpus ; the fingers are deeply 

 excavated iuferiorly, and their apices are broad and dentate ; the immobile finger is 

 broader than the dactylus, while its outer border is sharp and regularly serrated. The 

 ambulatory limbs are short and stout, with the joints granulated, and their anterior 

 margins pubescent ; the distal end of the meri and carpi terminates both above and below 

 in an acute spine, and the posterior surface of the latter joints is provided with a short 

 median carina ; the dactyli are short and broad, terminating in a strongly curved claw, 

 with a series of acute teeth on the posterior margin, the last of which so nearly equals 

 the terminal claw that the joint has a biunguiculate appearance. 



The ocular peduncles are slightly elongated, with the cornese rounded, and terminal in 

 position. The merus of the external maxillipedes is short and broad, with two narrow 

 and acute subequal spines on the inner margin. 



The abdominal segments are comparatively smooth, but the second, thu'd, and fourth 

 are each faintly bicarinate transversely, and a transverse impression is met with on the 

 fifth segment ; the posterior segments are slightly pubescent. 



This species is distinguished by its flattened acute rostrum, and the form uf its 

 carapace, ambulatory limbs, and other parts, characters which on the whole are those of 

 the genus Elasmonotus, as at present constituted ; at the same time the chelipedes bear 

 a close resemblance to those of certain species of Mimidojosis [Mimidopsis hrevimana, 

 Henderson, and Mimidopsis pilosa, Henderson). I do not now feel justified in placing 

 it, as I formerly did, in a subgenus intermediate between these two genera, but refer it 

 (as well as the next species) to the former, though I may be allowed once more to express 

 a doubt as to whether Elasmonotus itself may not have to 1je united with Mimidopsis. 



Breadth of carapace (of a female with ova) 11 mm., length of body (including 

 rostrum) 33 mm., of carapace (including rostrum) 17 mm., of chelipede 19 mm., of first 

 ambulatory leg 18 mm., diameter of ova 0'9 mm. 



Habitat. — Station 219, north of Papua; depth, 150 fathoms; bottom, coral mud. 

 A single specimen. 



Elasmonotus debilis, Henderson (PI. XYHI. fig. 4). 



Galathopds debilis, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 417, 1885. 



Characters. — This species is closely alHed to the preceding, and as the two specimens 

 are both in too fragmentary a condition to admit of a detailed description, I shall 

 endeavour merely to point out its distinguishing features. The carapace is slightly more 



