1888.] G. M. Giles — Notes on the Amplilpoda of Indian Waters. 223 



I have preferred to class the present form under Anonyx on acconnt of 

 its more closely resembling in most other points the known species of 

 that genus than it does the hitherto described species of Opis. 



Since the date of the issue of Spence Bate's Catalogue of the Am- 

 phipods of the British Museum (1862), a considerable number of species 

 have been added to Afioiiyx and a few to Ojjis, the descriptions of all of 

 which are not accessible in India. From considerations of locality and 

 depth, it is, however, highly improbable that any of these corresponds to 

 the species now described. 



Sars (Archiv Math. Naturv. (Christiania) 1881, p. 437) has de- 

 scribed an eyeless species of the genus (J., typhlops) from 1710 fathoms in 

 the Arctic seas, but I have not been able to obtain access to the paper. 

 The temperature of the water at such depths as 1300 and 1710 fathoms is 

 pretty constant all over the world, and deep-sea species have, as a rule, 

 a wide distribution, so that it is possible that our forms may be the same. 

 Still it appears extremely unlikely that the present species would be 

 able to obtain suitable food in such regions, so that, provisionally at 

 any rate, I describe it as new in the absence of any evidence to the 

 contrary. 



2. Ampelisca lepta, n. sp.. Pis. VIII. & IX. 



This species was dredged in 107 fathoms on the edge of the 

 Swatch-of -no- Ground, at the head of the Bay of Bengal. A very large 

 number of specimens were obtained in the mass of soft mud brought up 

 in the dredge, which, with the exception of a few annelids, contained 

 no other living organisms. The mud contained a quantity of broken 

 lamellibranchs and pteropod shells, but none of these appeared to have 

 been recently inhabited. 



The subfamily Ampeliscades contains the single genus Ampelisca ; 

 Haploops wanting the character of having two pairs of simple eyes, and 

 so being very doubtfully a member of this subfamily. With the charac- 

 teristics of Ampelisca, as given by Spence Bate (Cat. Amphip. Crustacea, 

 p. 90), the present species entirely agrees, but it differs from the five 

 of the known species figured in that work in the slenderness of the 

 body, and in the great length of the fifth thoracic appendage, and wants 

 also the vinous colouration which appears more or less to characterize 

 many, of the species. These points, however, are hardly sufficient to be 

 of generic value. 



The animal measures about 6 mm. in length and is of a fine ivory- 

 white throughout, with the exception of the rings of dark brown pi'nnent 

 surrounding the eyes. 



The head is of moderate size, irregularly quadrate ; the portion carry- 



