ig2i.] Fauna of the Chilka Lake : Polychaeta. 657 



obviously homologous to the peculiar setae found in the ist thoracic segment of 

 many other genera of Serpulidae. They are accompanied by a number, usually 

 four, of slender setae (fig. 27F), with finely tapering tips and minutely hispid edges. 



The dorsal setae of the 2nd-7th bundles are all capillary, in two rows, the 

 anterior row composed of 8 slender setae resembling those in the ist bundle (fig. 27F), 

 the posterior row of 7 shorter capillaries, not winged, but with slightly flattened 

 blades (fig. 27G). Sometimes these setae appear quite smooth, but in other cases 

 the blades are minutely hispid, the edge easily fraying, so as to appear serrated. 



The ventral bundles are composed of uncini (fig. 27H, a and b), having 7, rarely 

 8 teeth. The lowest tooth is widely bifid. 



The abdomen is traversed by a ventral groove, shallow in front, but large and 

 deep behind. The posterior end, in most specimens, narrows abruptly to a conical 

 tail, terminating in two rounded lobes, between which the anus lies (fig. 27B). The 

 abdominal parapodia project prominently as flat lobes (fig. 27J) bearing a row of 

 uncini on the upper external margin, whilst the ventral capillaries project beneath 

 the lower edge. The ventral capillaries are usually two or three in a bundle, one or 

 two in the posterior segments. They project from the parapodium so far that the 

 exposed part of each seta is usually twice as long as the part embedded in the tissues. 

 The shaft expands suddenly towards the tip (fig. 27K), and then bends abruptly, 

 the bent portion being serrated. 



In the anterior abdominal segments there are about 26 uncini in each parapo- 

 dium. They resemble those in the thoracic segments, but have 11-12 rather slenderer 

 teeth (fig. 27L). They are also thinner and larger than the thoracic uncini, and when 

 viewed on edge the forks of the bifid spine are smaller. In the mid- abdominal region 

 there are 45 uncini in each foot, each with 12-14 teeth. In the posterior segments 

 there are 6-10 uncini in each foot, and they are smaller, with fewer and finer teeth. 



Habitat. — -Two pieces of wood, covered with the interlacing tubes of this species 

 were found in the Cochin Backwater, near Ernakulam, on the south-west shore of 

 the Madras Presidency, in September 1914. The masses of tubes resemble in general 

 appearance those of Pomatoceros triqueter, L-, or Hydroides norvegica, Gunn. They 

 were accompanied by several specimens of Balanus amphitrite. The salinity of the 

 water is probably very variable, but no precise information is available. 



LIST OF REFERENCES. 

 Annandale, N., 1907. — " The Fauna of Brackish Ponds at Port Canning, Lower 

 Bengal." Rec. Indian Museum, Vol. I, pp. 35 and 197. 

 „ „ 1915. — Cf A Naturalist's view of the Chilka Lake." Reprinted from 



The Calcutta Review, 1915. 

 Annandale, N., and Kemp, S., 1915. — " Fauna of the Chilka Lake. Introduction." 

 Mem. Indian Museum, Vol. V, p. 1. 

 „ „ and Kemp, S., 1916. — "Fauna of the Chilka Lake. Mollusca Gas- 



tropoda and Lamellibranchiata." Mem. Indian Museum, Vol. V, 

 No. 4, p. 327. 



