igoS.] 



Records of the Indian Museum. 



41 



is a nodulus at the junction of the middle and distal thirds of the 

 shaft, and between the nodulus and the terminal hook the shaft 

 is again slightly thickened. The proximal portion of the shaft 

 shows a gentle curve in a direction the reverse of that of the hook, 



the whole being thus somewhat /-shaped (v. text-fig. 3). These 



setae project very slightly from the surface of the body. 



The dorsal bundles as far as the seventh segment are generally 

 (or always, with perhaps the exception of the seventh itself) made 

 up of needle-setae alone ; the eighth segment may bear dorsally 

 either needles, or hooks, or both ; the ninth and succeeding seg- 

 ments bear hooks only. The ventral bundles, as far as the fifth 

 segment, have only needle-setae ; those of the sixth and seventh, 

 needles, or hooks, or both ; posterior to this the ventral bundles 

 consist of hooks only. The needle-setae, therefore, extend some- 

 what further back dorsally than ventrall3^ 



Fig. 4. — Showing the general shape and the ontlines of the ahmentaiy canal ; 

 the setae are not shown: /.. black particles in intestinal wall; ce., oesophagus; 

 ph., pharnyx. 



The number of setae in a bundle is three or four in the anterior 

 and middle portions of the animal's length, diminishing to two 

 or one at the posterior end. 



The pharynx is a somewhat globular organ in the second 

 and third segments ; the oesophagus, a narrow tube with com- 

 paratively thick walls, forms in the preserved specimens a series 

 of curves, passing through a stout septum behind the tenth 

 segment (septum i^), and widens abruptly into the intestine. 

 This latter tube may be regularly dilated and constricted through- 

 out a large part of its length, the constrictions being probably 

 due to its passage through the septa. The epithelium shows 

 within its component cells, through a large part of its extent, 

 a number of fine black particles (text-fig. 4). 



