424 ME. J. E. HEKDEESON — A CONTRIBUTION 



This species is very common in the backwaters along the Madras coast ; I do not 

 know whether or not it also lives in the sea. Young specimens are found in great 

 numbers inhabiting the shells of a common brackish-water Cerithiid. The largest 

 example I have seen is about 10 mm. long. 



Distribution. Mergui (De Man). 



228. Clibanarius Arethusa, De Man. 



C.Arethusa, De Man, Mergui Crust, p. 252 (1888). 



Muttuwartu Par (Thurston); Rameswaram ; Madras, living among large stories in 

 the harbour (J. H. H.). 



The following characteristic colouring is observable : — The cephalothorax is grey, the 

 eye-stalks, antennal peduncles, chelipedes, and ambulatory legs deep brick-red, without 

 bands ; the chelipedes and ambulatory legs are tipped with black, and several minute 

 black spinules are seen on the under margin of the propodi of the second and third legs. 

 The largest specimen is 35 mm. long. One example has the right eye-stalk only half 

 the length of the left, probably in process of repair. 



Distribution. Mergui (De Man). 



Genus Catapagurus, A. Milne-Edwards. 



229. Catapagurtjs ensifer, n. sp. (PL XXXVIII. tigs. 16-19.) 



Gulf of Martaban ; three females with ova, and two males in shells of Nassa, sp., and 

 Natica, juv. (Oates). 



The carapace is glabrous, with merely a few hairs towards the margins; the frontal 

 projections are obtusely rounded. The eye-stalks are moderately long and stout, being 

 little shorter than the antennal peduncles. The ophthalmic scales are narrow, but well 

 developed, and with the inner edge slightly convex. The antennal acicle is short and 

 almost straight, not reaching the distal end of the penultimate peduncular joint ; the 

 flagellum is more than twice the length of the body. The antennular peduncle exceeds 

 the antennal peduncle by nearly the two distal peduncular joints. 



The chelipedes are longer than usual, the right being considerably stouter but not 

 much longer than the left, with the surface very faintly granulated, but the granules 

 subspinulose on the carpus. The hands are glabrous above, merely a few granules 

 being seen with a lens. The right carpus is nearly equal in length to the right palm, 

 and the fingers are about half this length ; the left carpus is much shorter than the 

 left palm, and on this side the fingers are about equal in length to the palm. The 

 ambulatory legs are almost smooth, with merely a few slight hairs on the anterior 

 margin of the broad flattened meri ; the propodi and dactyli, which are about equal in 

 length, are elongated and flattened, without fringing hairs. Each dactylus bears a 

 strong resemblance to a curved sword-blade (hence the specific name), and is slightly 

 broader than the propodus, measuring both at the broadest point. The male copula tory 

 organ (protruded vas deferens or ductus ejaculatorius) is very long and slender ; com- 



