ChiI;TON.— Crustacea of the Kennadec hlanih. 565 



rather convex, its margin being unevenly crenate ; tlie dactyl is broad, 

 sul)a,cute at extremity, and overlaps the propod. 



There are some differences between my two male specimens, and it is 

 evident from the account given by Stebbing that the gnathopods of this 

 species have been differently described by different authors, the explana- 

 tion probably being that these appendages vary considerably with age and 

 sexual development. 



The teeth on the pleon segments also show consideralile variation in 

 some of the species of Melila, so that the discrimination of the species is 

 peculiarly difficult. 



In the meantime I refer my specimens to M. pahnatn, the species to 

 which they appear to agree most closely. They cannot be identified with 

 the preceding species, M. inaequistylis, for they differ considerably in the 

 teeth on the pleon segments and in the shape of the second gnathopod of 

 the male ; unless, indeed, we are here dealing with one cosmopolitan and 

 variable species in which there are several forms of the male, as appears 

 to be the case with the next species, Aora typica Kroyer. 



Aora typica Kroyer. 



Aora typica Chilton, Ann. Mag. Nat. Hist., ser. 5, 16, p. 370, 1885 ; and 

 Subant. Islands N.Z., p. 645, 1909 : Stebbing, Das Tierreich Amphip., 

 p. 587, 1906. 



One male from Coral Bay, Simday Island, with first gnathopod of the 

 type described as A. gracilis by Spence Bate, and mentioned as " form 2 " 

 in my first paper quoted above. 



This particular form of the male is very widely distributed. 



? Orchestia gammarellus (Pall.). 



? Orchestia gammarellus Stebbing, Das Tierreich Amphip., p. 532, 1906 

 (v\dth synonymy). 



Numerous specimens " in sand under stones above tide-marks, Coral 

 Bay, Sunday Island." 



These specimens are all rather small and probably not fully mature, 

 and none of tfie males show any enlargement of the merus and carpus of 

 the fifth peraepods, but in all other respects they appear to agree closely 

 with the description and figures of this species by Stebbing and Sars. They 

 seem to be indistinguishable from New Zealand specimens that I have re- 

 ferred to this species. 



Parorchestia tenuis (Dana). 



Parorchcstia tenuis Stebbing, Das Tierreich Amphip., p. 557, 1906 (with 

 synonymy) ; Chilton, Subant. Islands N.Z., p. 642, 1909. 



Four specimens from a fresh-water stream, Sunday Island. 



These specimens are too close to New Zealand examples to be looked 

 upon as a separate species. They differ, however, from Stebbing's descrip- 

 tion and from typical specimens in having the first gnathopod of the male 

 shghtly more slender and more spinous, and the outer rami of the first 

 and second uropods provided with 2 or 3 small marginal spines. 



In New Zealand the species is common in brackish water at the mouths 

 of fresh-water streams, and occurs as far south as Campbell Island. An 

 allied species, P. kawaiensis, is found in the Hawaiian Islands. 



