196 COLLBCnONS FROM MELANESIA. 



13. Eyasteuus (Chorilia) planasius. 



Pisa plaaasia, Adams ^ White, Crust, in. Zool. Voy. ' Samarang^ 



p. 9, pi. ii. figs. 4,6(1848). 

 Hyastenus planasius, A. M.-Edwards, N. Areh. Mus. Hist. Nat. viii. 



p. 250 (1872). 



A small male was obtained at Port Denison witi H. oryx 

 (No. 122). The original types (and specimens in tlie Museum 

 collection) were from the Chinese seas. 



14. Hyastenus (ChorUia) convexus. (Plate XVIII. fig. B.) 



Carapace subpyriform, somewhat scantily pubescent ; gastric region 

 elevated, rounded and convex ; cardiac region also somewhat elevated 

 and rounded ; branchial regions with three low rounded promi- 

 aences ; no lateral epibranchial spine ; the prseoculat angle of the 

 orbit is prominent, but caB scarcely be said to be produced in the 

 form of a spine ; there are two spines on the pterygostomian 

 region, between the lateral margins of the buccal cavity and the 

 sides of the carapace. Spines of rostrum slender, nearly straight, 

 and strongly divergent. Postabdominal segments distinct. Pasal 

 antennal joint with a small spine or tooth at its antero-external 

 angle. Chelipedes of male of moderate length-; merus or arm 

 rather slender and nearly smooth; wrist with a very small tooth 

 on its inner margin ; palm not twice as long as broad, somewhat 

 inflated, with a small tubercle on its upper margin ; fingers about 

 as long as the palm, arcuated, meeting only toward the apices, 

 which are minutely denticulated and acute ; upper finger with a 

 tubercle or small tooth on its inner margin near the base ; the 

 fingers (when closed) have between them a wide hiatus. Ambu- 

 latory legs very slender and smooth : the anterior pair much the 

 longest, the three following diminishing successively in length. 

 The colour of the single specimen examined is a uniform light 

 yellowish brown. Length of carapace a little over 5 lines (11 mm.) ; 

 greatest breadth nearly 4 lines (8 mm.); length of rostral spine 

 a little over 3 lines (7 mm.), of chelipede about 6 lines (nearly 

 13 mm.), of first ambulatory leg rather over ].0 lines (22 mm.). 



The unique male example was obtained at Port MoUe, 14 fins. 

 (No. 93), and in size and form of the chelipedes is very comparable 

 to H. gradlirostris, Miers, from the Pijis, from which, however, it 

 is at once distinguished by the absence of spines on the carapace. 



15. Naxia serpulifera, M.-EeLw. 



Thursday Island, 4-6 fms. (No. 130), two young males (first 

 coUection). A good series of dijBEerent ages and of both sexes from 

 the same locality has been retained from the second collection (175). 



Specimens are in the British-Museum coUection from Shark Bay, 



