TO INDI.AJSr CAECINOLOGY. 34] 



Order DECAPODA. 

 Suborder BRACHYURA. 



Group O X Y R H Y X C H A. 



Genus AcH^us, Leach. 



1. ACH^TTS LACERTOSUS, StilUpSOU. 



A. lacertosus, Stimpson, Proc. Acad. Nat. Sci. Pliilad. p. 218 (1857); Miers, 'Alert' Crust, p. 188 

 (1884). 



( = A. hreviceps, Haswell) . 



Gulf of Martaban, two females with ova, and a male {Oates). 



These specimens are not in a very good state of preservation, but there can be little 

 doubt that they belong to this species. 

 Distribution. E. & N. Australia. 



2. AcHiEUS APFiNis, Miers. 



A. affinis, Miers, ' Alert' Crust, p. 188 (1881); De Man, Brock's Crust, p. 21 S (1888). 



Gulf of Martaban, a female {Oates). 



This species is distinguished from the last chiefly by the presence of a prominent 

 bilobcd tubercle on the cardiac area, and by its tuberculated ocular peduncles. 

 Distribution. E., N., audW. Australia, Malay Archipelago. 



Genus OxciNoprs, De Haan. 



3. Oncixopus aranea, De Haan. 



O. aranea, De Haan, Crust. Japon. p. 100, pi. xxix. fig. 2 (1850). 



(= 0. Nejjtnnu.s-, Adams & White, <>. subpellucidus , Stm., (>. awjululus, Hasw.). 



Muttuwartu Par, a female A\'ith ova, and a male carrying a Sacculinu [Thurston). 

 Gulf of Martaban, several specimens {Gates). 



All the described species of this genus are referred by Miers to O. aranea, and he has 

 shown that there is considerable variation in the length and robustness of the legs, 

 characters on which the so-called species had been founded. The carapace and legs arc 

 mvich more attcnuatc^d in the male than in the female. 



Distrilmtion. Japan, ^lindoro Sea, Singapore, N. & N.E. Australia, New Hebrides. 



Genus Huexia, De Haan 



4-. HuENiA Proteus, De Haan. 



H. Protcm, De Haan, Crust. Japon. \>. 95, pi. xxiii. figs. 4, 5 J , fig. 6 ? (1850). 



(= //. De/iaarii, White; //. Proteus, vars. temiipes, elovi/uta, and hcraldica, Adams & White). 

 SECOXU SERIES. — ZOOLOGY, VOL. V. 50 



