TO INDIAN CAKCINOLOGY. 341 



Order DECAPODA. 

 Suborder BRACHYUBA. 



Group OxYRHYNCHA. 



Genus Ach^eus, Leach. 



1. Ach^us lacertosus, Stimpson. 



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

 (1884). 



( = A. breviceps, 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. Ach^eus affinis, Miers. 



A. affinis, Miers, ' Alert ' Crust, p. 188 (1884) ; De Man, Brock's Crust, p. 218 (1888). 

 Gulf of Martaban, a female {Oates). 



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

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

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



Genus Oncinopus, De Haan. 



3. Oncinopus aranea, De Haan. 



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



(= O. Neptunus, Adams & White, 0. subpelhicidus, Stm., 0. angulatus, Ilasw.). 



Muttuwartu Par, a female with ova, and a male carrying a Sacculina {Thurston). 

 Gulf of Martaban, several specimens {Oates). 



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 are 

 much more attenuated in the male than in the female. 



Distribution. Japan, Mindoro Sea, Singapore, N. & N.E. Australia, New Hebrides. 



Genus Huenia, De Haan- 



4. Huenia Proteus, De Haan. 



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



(= H. Dehaani, White; H. Proteus, vars. tenuipes, elongata, and keraldica, Adams & White). 

 SECOND SEKIES. — ZOOLOGY, VOL. V. ;,( l 



