578 Memoirs of the Indian Museum. [Vol. V, 



the dorsal setigerous division is to be found in various stages of reduction. In 

 Micronereis the foot has not yet been adequately described, but appears to consist of 

 dorsal and ventral cirri, ligules, and setigerous divisions, the median ligule being 

 absent. 



In Dendronereis the foot appears to be normal, except that in some anterior 

 segments the dorsal and ventral fillets project in a large and variable number 

 of lobes. In Dendronereides the ventral ligule is absent. In some anterior segments 

 the dorsal ligule is richly branched. In the posterior parapodia only dorsal and 

 ventral cirri and median ligule are present. In Tylonereis the median ligule is 

 apparently absent, but it may be represented in the anterior segments by the 

 retractile lobe, and in the posterior segments by the lower lobe of the dorsal setige- 

 rous division. Ceratocephala, Malmgren, with which I am not acquainted, seems to 

 be very abnormal. Judging from Malmgren's figures, it has a dorsal cirrus, a bifid 

 ventral cirrus, a ventral ligule, dorsal and ventral setigerous divisions, and a lobe 

 near the dorsal setae, which may be either the dorsal or median ligule. Tylorrhynchus, 

 Grube, has dorsal and median ligules but no ventral ligule. The remaining genera of 

 the family, comprising Leptonereis, Leonnates, Nereis, Pennereis, Platynereis, and 

 Cheilonereis, have parapodia of typical structure. 



Lycastis indica, sp. nov. 

 (Plate XIX, figs. 2A-j, and text-figs. 2 a-d.) 



This species was taken in three different localities. It was not found in 

 the Chilka Lake. 



The five specimens from the Beliaghatta Canal are small, and the largest is 

 incomplete. It is 26 mm. long, and consists of the head and 120 setigerous segments. 

 Probably the perfect individual had at least 200 segments. The smallest specimen, 

 8 mm. long, has 40 setigerous segments. The specimen from the Cochin Backwater 

 differs slightly from the others, and is described below. The specimen selected for 

 the examination of the feet, from the Beliaghatta Canal, was complete, 16 mm. long, 

 having 115 setigerous segments. 



The dorsum is pale reddish brown in the anterior region, and the pigment 

 increases in density and redness towards the tail. The ventral surface is colourless 

 and deeply grooved. 



The head is thickly speckled with dark reddish brown pigment, except in the 

 median groove and the posterior median part, where it is colourless. The bases of 

 the tentacular cirri are pigmented, the remainder being colourless. The head (fig. 

 2A) is much broader than long, with two short tentacles in front. In the anterior 

 median region there is a deep groove which widens to form a pit on the middle of the 

 head. The eyes are on the posterior margin, almost in a straight line, and are pro- 

 vided with lenses. The palps are short, thick and stumpy, and the tentacular cirri 

 are also rather short. The jaws are short, with 9 teeth. The everted proboscis has 

 neither papillae nor paragnaths. 



The buccal segment is rather narrower than the succeeding ones. 



