1921.] Fauna of the Chilka Lake : Polychaeta. 629 



fig. 160) consists only of the dorsal cirrus, the two anterior lobes, and the ventral 

 cirrus. The branchia and posterior lobes have disappeared, and the fillet is perpendi- 

 cular. The posterior 12 feet are without branchiae. The anal segment bears a pair 

 of long tapering cirri, stout at the base. 



The setae are of the usual type. The dorsal capillary setae have slightly flattened 

 blades, with slight traces of a wing. The compound setae have the ends of the 

 shafts unequally bifid (fig. 17J), and slender terminal pieces. The edges of the latter 

 are minutely crenulate, rather than serrate. 



I have compared these two individuals carefully with specimens of Glycera alba, 

 Rathke, from Ireland, and have been unable to find any differences worthy of 

 specific rank. In the Cochin specimens the branchiae are a little longer, and the 

 lobes of the feet rather more acute, the posterior lobes being shorter relatively. It is 

 also possible that examination of more material would show differences in the struc- 

 ture of the anterior feet, especially in the origin of the posterior lobes. The structure 

 of the proboscis is very similar in both forms. 



Glycera africana, Arwidsson (1898, p. 21) and Fauvel (1902, p. 75), seems to be a 

 similar variety of G. alba, hardly distinguishable from the present form. It has been 

 recorded from Senegal, Cape of Good Hope, and the Red Sea. The branchiae of the 

 European forms of G. alba vary considerably in size, G. convoluta, Keferstein, having 

 apparently been described from specimens with very large branchiae. G. alba, var. 

 macrobranchia, Moore (1911, p. 301), from San Diego Bay, California, is very closely 

 related to the present form. A number of other species will probably eventually be 

 referred to G. alba, which appears to have an almost world-wide distribution. It has 

 not, however, previously been found in fresh or brackish water, though its wide dis- 

 tribution indicates great capacity for adaptation. 



Habitat. — Two specimens were collected in September, 1914, by F. H. Gravely, 

 in the Cochin Backwater, near Ernakulam, south-west coast of the Madras Presidency. 

 The water is of variable salinity, but precise information on this point is lacking. 



Glycinde oligodon, sp. nov. 



(Plate XXVII, figs. i8a-q, and text-figs. lya-c.) 



This species is widely distributed in the Chilka Lake. The type specimen is an 

 immature female, 20 mm. long, having 97 setigerous segments. The colour of the body 

 is a dark greenish yellow. . In the intersegmental areas of the lateral region the pig- 

 ment is much darker, except between the parapodia. In the median ventral line 

 there is a row of dark spots — the neural eye-spots — not very distinct in the anterior 

 segments. Each spot is formed, sometimes by a small bar on each side of the in- 

 tersegmental groove, but more often by two short parallel longitudinal bars crossing 

 the groove. The body is narrow in front, and gradually expands till the beginning of 

 the posterior third. It then tapers a little, more rapidly in the last few segments, but 

 still the tail terminates rather bluntly, especially in small specimens (fig. i8b). The 

 anal segment bears two long cirri, swollen at the base, with long filiform tips. The 



