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



anus is terminal, and the cirri are ventral, equal in length to the last 9 or 10 seg- 

 ments. 



The segments increase in length up to the 22nd, where the length of each is two- 

 thirds of the width, then slightly decrease up to the 28th. Then they suddenly de- 

 crease greatly till the length is only -|th-§th of the width, the latter having at the 

 same time increased. The anterior part of the body is rounded, the middle and 

 posterior regions are flat. In the anterior segments the nerve cords are widely sepa- 

 rated (fig. 1 8a), and are indicated externally by faint lines of pigment, which are 

 thickened to form a dot in the middle of each segment. 



The basal ring of the head (fig. i8a) is broad, and has a small deeply seated 

 black eye at each side. No other eyes were observed on the head. The distal ring 

 of the head has four small tentacles, each having a small terminal joint furnished with 

 palpocils. The ventral tentacles are a little in front of the dorsal. The head is com- 

 posed of the basal ocular segment and eight tapering rings. The dorsal region of the 

 head is defined by lateral grooves. 



The everted proboscis is armed with two dorsal and two ventral bands of tooth- 

 like papillae or paragnaths (fig. 18c). Each ventral band consists of two rows of 

 papillae. The inner or median row is composed of soft mammillate papillae (fig. 18E), 

 each with a pore at the tip. The outer row is composed of harder thick-walled parag- 

 naths (fig. i8f), each with one large and one small tooth. These outer paragnaths 

 are largest at the proximal end of the everted proboscis, and become smaller and 

 more. shapeless towards the distal end. Each dorsal band consists of four irregular 

 rows of paragnaths. Between the bands, in the median dorsal line (fig. i8c),is a 

 row of small rounded horny papillae with transverse apical pores. The paragnaths 

 composing the inner row of each dorsal band are distinguished clearly from the 

 others by their larger size and peculiar shape (figs. 18c and i8d). Each is attached 

 near the middle, and the outer end is expanded to form a knob. The inner end is 

 pointed, and a short distance from the tip on the upper side is a round pore. Laying 

 externally to this row, are three very irregular rows of paragnaths, those in the outer 

 row being usually the smallest. They have simple bases, and the tips may be simple 

 or bifid, with terminal pores. The paragnaths, in addition to being in longitudinal 

 bands and rows, are also arranged in transverse rows, each row being completed in 

 the lateral region of the proboscis by a ridge. On this ridge, on each side, are two 

 flat papillae with pointed angles (figs. 18c, i8g). These ridges and papillae are 

 absent on the basal part of the proboscis, largest in the middle and distal regions. 



The jaws (fig. i8h) are disposed in a single row, and are very few in number. 

 There are two large ventral jaws (a) each with two or three large blunt roots and 

 six teeth. There are no small jaws between the large pair. There is a dorsal row of 

 four small denticles, each consisting of several rounded lobes (b), sometimes with 

 two sharp teeth (c), or with four teeth aud a larger bifid tooth {d) occasionally there 

 is an additional denticle, still smaller and simpler. 



The ist foot is very small, the 2nd a little larger, and the 3rd almost normal 

 in size. 



