1921.J Fauna of the Chilka Lake : Amphipoda. 527 



Upper antenna (fig. i&) shorter, subequal with the lower (fig. ic), fiagellum not 

 so stout as in the male. 



First gnathopod (fig. le) much larger than the second, but not so large as in the 

 male ; propod oval, palm regularly convex, fringed with stout setules, hind margin 

 not so abundantly fringed with setules as in the male ; finger smaller, inner margin 

 regularly concave and bearing a few minute setules. 



Second gnathopod (fig. if) as in the male, but with propod rather smaller. 



Length of body, 4 mm. 



Colour. Pale yellow, with a few darker markings. 



Remarks. This species agrees well with the characters of the genus and evidently 

 comes pretty close to I. aequicornis Sars, from Arctic Seas. It differs in the male 

 chiefly in the greater length of the antennae, especially of the upper, and in the shape 

 of the first gnathopod. In both sexes it differs also in the smaller accessory fiagellum, 

 the shape of the carpus of the second gnathopod and in the unequal branches of the 

 third uropod. 



The sexual differences appear to be confined to the antennae and the gnathopods. 

 In the male specimen examined the third uropods also differed from those of the 

 female shown in fig. ig in having both margins of the inner branch free from setae 

 except for the small tuft near the base of the inner margin and the two or three 

 towards the apex on each margin. 



[Only taken in the main area of the lake on a muddy bottom some distance 

 from shore in 4^ to 5 J feet of water. N.A.] 



Perioculodes longimanus (Bate and Westw.). 



(Text-fig. 2.) 



Perioculodes longimanus Stebbing, 1906, p. 237. 



Perioculodes longimanus Sars, 1892, p. 313, pi. no, fig. 2 ; pi. in, fig. 1. 



Monoculodes megapleon Giles, 1888, p. 235, pi. 7, fig. 12. 



? Oedicerus puliciformis Giles, 1888, p. 248, pi. 7, fig. 5 and 6. 



Localities : — • 



2 to 4 miles N.E. JE. of Gunta Sila. Many. 

 1 mile N.N.E. of Breakfast Island. Several. 



1 to 9 miles N.E. |E. of Breakfast Island. Several. 



2 to 8 miles N.E. £E. of Kalidai. Several. 



1 mile E. by N. of Patsahanipur. Several. 



2 to 6 miles E. by S. JS. of Patsahanipur. Several. 

 4 mues N.E. JE. of Kalidai. Several. 



1 to 2 miles S.E. by S. of Patsahanipur. Several. 



This species was obtained in great abundance at some of the stations, the male 

 specimens, however, being very rare. I refer them to Perioculodes longimanus (Bate 

 and Westw.) with some hesitation. They agree on the whole well with Sars' figures 

 except as regards the antennae (fig. 2), which in both sexes have the third joint 

 of the peduncle of the upper antenna considerably shorter than the second and the 



