652 Memoirs of the Indian Museum. [Voi,. V, 



mens where the majority had short tips. Moreover the left ventral branchia, which 

 was always much shorter than the others, always had an elongate tip. It seems 

 probable, therefore, that the long tip is the normal condition, and that the short 

 tips are due to accidents. 



Dorsally the front margin of the collar slopes backwards, and the two ends are 

 attached near the median line (fig. 28A). Ventrally the collar inclines forward 

 (fig. 28b), and in the ventral region it is deeply cleft and bilobed. 



The thorax is composed of 6 setigerous segments. The faecal groove is narrow 

 shallow, and very indistinct, and can hardly be seen on the abdomen. Ventral 

 gland shields are very inconspicuous. On the mid-dorsal area there is a slightly 

 elevated ridge (fig. 28A), especially distinct at the anterior end, where it narrows, and 

 lies between the ends of the collar. The first thoracic segment bears only dorsal 

 bundles of setae. Each bundle contains 7 setae, the 3 upper being long and 

 bilimbate, as in the succeeding thoracic segments (fig. 28F). The 4 lower setae are 

 shorter (fig. 28E), with wider and shorter bilimbate blades and filiform tips. They 

 are intermediate in shape between the elongate capillaries and the spatulate setae. 

 In the remaining thoracic segments, the dorsal bundles contain two types of ?etae, 

 capillary and spatulate. The capillary setae (fig. 28F) have elongate narrow wings 

 and very long filiform tips. There are 3-6 ïn each bundle. Beneath and behind 

 them are the spatulate setae, 5-10 in number. They have pear-shaped blades 

 (fig. 28G) with finely pointed tips. The ventral bundles also contain two types of 

 setae. The anterior row (figs. 28H, 28j) consists of 7-10 cuspidate setae (soies en 

 pioche). The posterior row contains 7-9 avicular uncini (fig. 28k). The anterior 

 part of the base is large and swollen, and the posterior process is rather short. 



In the anterior abdominal segments the ventral bundles contain 5-7 capillary 

 setae, with short blades and very long filiform tips. They vary in length (figs. 281,, 

 28m), but are all bilimbate, and the blades are shorter and wider than those of the 

 thoracic setae. The dorsal bundles contain 9 or 10 avicular uncini (fig. 28n), differing 

 very slightly from those of the thorax. The posterior process is shorter, and the 

 spinose crown is higher and narrower. The uncini vary much in size in each bundle, 

 the largest being ventral, the smallest dorsal. In the posterior part of the abdomen 

 the setae are similar, but fewer and smaller. The ventral bundles contain 1-3 

 capillary setae, the dorsal bundles 1-3 uncini. 



The most remarkable feature about the setae of this species is the great length 

 and extreme slenderness of the tips of the capillary setae, from which character the 

 specific name is derived. 



Habitat. — From a brackish pool, Port Canning, Lower Bengal, December 1908. 

 The water here is of very variable salinity (Annandale, 1907, pp. 35 and 197). 



Laonome indica, sp. nov. 



(Plate XXX, figs. 26A-H.) 



Only a single individual of this species is available. It is 28 mm. long, the trunk 

 being 26 mm., and the unusually short gills only 2 mm. The body is slender, 



