MARINE CRUSTACEANS. 



247 



any gi'anulation of the carapace, which, when laid bare, is absolutely smooth, save for the stumps 

 of the hairs. The larger hand is very stout and the fingers short. 



The species was taken in South Nilandu, Haddumati, North Male, Mulaku, Suvadiva, Felidu, 

 Kolumadulu, and Fadifolu Atolls, in 12—70 fathoms of water. 



11. Pilumnus maldivensis, n. sp. (Fig. 47). 



Diagnosis ; " A Pilumnus with the carapace convex both fore and aft and from side to 

 side, smooth, pubescent and hairy, the regions faintly marked ; the middle lobes of the front 

 prominent, the outer lobes very small ; 



the lower rim of the orbit finely ^ ^^^ 



toothed, the upper rim smooth, with 

 traces of two notches ; the antero- 

 lateral edge short, with three spini- 

 form teeth and a spine on the orbital 

 angle ; the chelipeds unequal, granular 

 and hairy outside, a small bare patch 

 at the base of the fingers and along 

 the lower edge of the greater hand, 

 fingers moderately long, smooth ; and 

 the walking legs of moderate length 

 and stoutness, hairy and pubescent, 

 and without thorns on the meropo- 

 dites." 



Length: 4 mm. Breadth: .5 mm. Fig. 47. Pilumnus maldiveruiis; a. whole animal, b. outside of hand, 

 (Largest specimen.) Colour in spirit : <^- oie of the teeth of the anterolateral edge, 



yellowish-white, fingers white. 



This species seems to be akin to P. caerulescens A. M.-Edw. 1873, which is included in 

 Major Alcock's list of Indian Crabs, but the colour and the .spiniform orbital angle serve to 

 distinguish it. It was dredged in Suvadiva, North Male, Miladumadulu, and South Nilandu 

 Atolls, in 25—4.3 fathoms. 



12. Pilumnus rotumamis Borradaile, 1900. ?subsp. 



Pilumnus rotumanus Borradaile, Proc. Zool. Soc. 1900, p. 581, pi. XLI. fig. 6 (1900). 



A single female of this crab was taken on the shore at Hulule, Male Atoll. It differs 

 from the type specimen in two points: (1) The moveable finger, which in P. rotumanus has 

 a slightly uneven cutting-edge, has in the Maldive example a row of well-marked teeth. 

 (2) The carapace of the Maldive specimen is narrower relatively to its breadth. 



Both specimens are females, but it is possible that these differences may be due to age, 

 since the Rotuman individual is much larger than that from Hulule (length 15 mm. as against 

 8 mm.). Or, again, a series fi-om each locality might show that the features in question are 

 not characteristic. 



13. Pilumnus elegans de Man, 1887. subsp. 



See Pilumnus elegans de Man, Arch. Naturges. 53 i. p. 310, pi. xii. fig. 3 (1887). 



The specimens agree with de Man's description in all points but the two following: 



G. 32 



