316 16 



Subtribe Brachygnatha. 



Superfamily Oxyrhyncha or Inachidea. 



Family Hymenosomidæ. 



Rhynchoplax coralicola Rathbun. 



Rhgnchoplax coralicola, Rathbun, Proc. Biol. Soc. Washington, XXII, 108, 190U. 



Closely allied to R. setirostris Stimpson ' (which I have not seen) and distinguished 

 chiefly by having only one lateral spine instead of two. 



Adult female. — Shell very thin and soft, spotted with fine black dots, and 

 sparingly hairy, some of the hairs long and hooked. Carapace ovate, with a 

 reentering angle above the base of the last leg, and a rostrum consisting of a long 

 median spine and two very short lateral spines; regions indicated by fine impressed 

 lines. Carapace bordered by a raised rim, passing behind the rostrum and above 

 the well-marked and almost forward-pointing antero-lateral spine. A small post- 

 ocular tooth. Eyes large, reaching forward as far as the 

 lateral spines of the rostrum. 



Epistome deep. Merus and ischium of endognatli 

 subequal in length; merus obliquely cut on the antero- 

 internal border; exognath posteriorly exposed. Chelipeds 

 feeble, unarmed ; fingers as long as palm. Legs longer 



than chelipeds, unarmed except the dactyli which are 



Fig. 5. Hhynchoplax coralicola, . 



typeÇ, 1-7 mm. wide: a, cliela; spmulous. 



b, leg. Dimensions. — Length, including rostrum, 22 mm. ; 



excluding rostrum 18 mm.; width 17 mm. 

 Type locality. — Singapore, on coral reef; XII. 5; one adult Ç. 



Family Inachidæ. 



Subfamily Inachlnæ. 

 Achæus lacertosus Stimpson. 



Achœus lacertosus Alcock, LXIV, 172, 1895; Stimpson, Smithson. Misc. Coll., XLIX, 20, pi. Ill, fig. 7, 1907. 

 Koh Chuen, 30 fath., shell bottom; I. 2; 1 ? ovig. Between Koh Riat and 

 Koh Mesan, 3—5 fath., sand, algæ; II. 7; 1 ? ovig. Tung Kaben, 6 fath., sand, 

 mud, phanerogams; II. 22; 1 ? ovig. Koh Kram, 30 fath., III. 2 and 21; 1 ?. 



Achæus affinis Miers. 

 Achœus afßnis Miers, Alcock, LXIV, 172, 1895. 



Koh Kam, 5 fath., gravel; II. 6; 1 ?. Between Koh Rin and Clifi" Rock (N. of 

 Koh Kram), 15 fath.; III. 2; 1 J". Koh Kram, 30 fath.; IH. 2 and 21; 3 <^ 4? 1 ovig. 



' Smitlison. Mise. Coll., XLIX, 148, 1907. 



