CEUSTACEA OF THE MEEGUI ARCHIPELAGO. 47 



35. AcTUMNUS SETiEEE, de Haan. 



Cancer (Pilumnus) setifer, de Haan, Fauna Japonica, Crustacea, p. 50, 

 pi. iii. fig. 3. 



Actumnus tomentosus, Dana, I. c. t. i. p. 243, pi. xiv. fig. 2. 



Actumnus setifer, Alph. Milne -Edwards, Nouv. Arch, du Museum Hist, 

 Nat. t. i. p. 287, pi. xviii. fig. 5. 



Actumnus tomentosus, Alph. Milne-Edwards, I. c. p. 285, and Nouv. 

 Arch. Mus. Hist. Nat. t. ix. p. 194. 



Actumnus setifer, Miers, Report on the Zoological Collections made 

 during the Voyage of H.M.S. ' Alert, ^ Crustacea, pp. 225 & 226. 



A small male specimen, which I refer to this species, was col- 

 lected in the Mergui Archipelago. 



The antero-lateral margins are armed with three small spini- 

 form teeth behind the scarcely prominent, though acute external 

 orbital angle, and some small acute granules occur between 

 these spiniform teeth. The lobes of the upper surface of the 

 cephalothorax are very distinct and covered with small acute 

 granules anteriorly and on the antero-lateral regions, those of 

 the hepatic region being the largest and most prominent. The 

 specimen has lost one chelipede. In the preserved chelipede, the 

 outer and upper surface of the hand is covered with many acute 

 granules, which even occur at the base of the index ; the mobile 

 finger is covered with some acute granules at its base. The 

 fingers appear to be smooth and their tips are pointed ; the 

 index is provided with a small tuft of hair on its outer and on its 

 inner surfaces, near the dentiferous margin. The outer surface 

 of the hand is rather convex, whilst the inner surface is nearly 

 plain and almost perfectly smooth, which is also characteristic of 

 the inner surface of the fingers. 



Actumnus setifer has been recorded from Japan, Tahiti, and 

 JS'ew Caledonia. 



36. Actumnus elegans, n. sp. 



Of this new species, seven specimens (5 d" , 2 $ ) were collected 

 at Sullivan Island. It is most closely allied to Actumnus obesus, 

 Dana, from the Sandwich Islands, which evidently represents tliis 

 form in the Mergui Archipelago. 



It may be distinguished at first sight from A. obesus by the 

 antero-lateral margins being armed with six acute spinuliform 

 granules, behind the acute granuliform external angle of the 

 orbits, arranged in three groups, two together. 



