CETJSTACEA OP THE MEBGTJI ARCHIPELAGO. 26] 



the end of the terminal segment measures about 27 centim. The 

 hands are nearly equal in shape and size, and the cardiac region 

 is armed with some spines. 



Thalassina anomala has been recorded from the Nicobar Islands, 

 Jaya, Borneo, the Philippine and Fiji Islands. 



Family Sctllaeid^. 



Grenus Thenus, Leach. 



146. Theis'us oeientalis, JFahr. 



Scylkrus orientalis, Fabricius, Suppl. Enfom. p. 399. 

 Thenus orientalis, Milne- Edwards, Hist. Nat. des Crustaces, p. 286 ; 

 Desmarest, Considerations sur la Classedes Crustaces, pi. xxxi. fig. 1. 



Five specimens were collected in the Mergui seas. 

 Thenus orientalis inhabits the Indian Ocean. 



Family Aipheid^. 



Genus Alpheits, Fahr. 



147. Alphetjs beevirostris, OUv. 



Palsemon brevirostris, Olivier, Encyclop. Methodique, t. viii. p. 664, 

 pi. 319. fig. 4. 



Alpheus brevirostris, Milne-Edwards, Hist. Nat. des Crustaces, t. ii. 

 p. 360. 



Alpheus malabaricus, Hilgendorf, Monatsher. d. Jc, preuss. Akad. d. 

 Pf^iss. Berlin, Nov. 1878, p. 832 (nee Alpheus malabaricus, de Haan). 



An adult specimen was collected at Elphinstone Island, and a 

 young one in King Island Bay. 



This species is most closely allied to Alpheus malabaricus 

 (Fabr.), de Haan, and A. Kingsleyi, Miers, both from Japan. 

 These three species form a small section of the genus, which 

 may be distinguished from the other species of Alpheus with a 

 spiniform rostrum, rounded ocular hoods, and having the basal 

 joint of the outer antennse without an esternal spine, by the 

 upper margin of the larger hand being notched, and by the 

 lower being entire. Mr, Kingsley is wrong in uniting A. rapax 

 (Fabr.), de Haan, to this section, as in it both margins of the 

 larger hand are entire. 



