670 Memoirs of the Indian Museum. [Voiv. V, 



tions of the middle parts of the body there can be found the connection of the 

 dorsal vessel with the lateral vessels which in some parts give off branches running 

 into the lateral fin-like bodies. The ventral vessel is simple for the greater part of 

 its length usually inside the ventral sinus. Its posterior communication with the 

 dorsal vessel could not be traced out, owing to my careless manipulation while 

 sacrificing the body to the microtome. So far as my observation goes, the vascular 

 system appears to be in communication, as in other Ichthyobdellids, with the coelomic 

 cavity. 



The coelome represents a system of very complicated sinuses, especially in the 

 anterior two-thirds of the body. In the anterior region there is a large sinus which 

 surrounds the pharynx and its sheath, the brain and nerve cords, and communicates 

 on each side with lateral sinuses. This large sinus is divided in the middle region 

 into two sinuses, dorsal and ventral, which connect with the lateral sinuses, after 

 uniting into a common canal. The lateral sinuses in these two regions are widely 

 spread in the lateral fin-like bodies, forming a system of anastomoses. They com- 

 municate with each other by metamerically arranged transverse canals just beneath 

 the epidermis and thus form a complete circle. In the posterior region the arrange- 

 ment of sinuses closely resembles that of Pontobdella and does not present any special 

 features. No trace of pulsating vesicles could be detected even in sections. Judging 

 from its arrangement and extension, the lateral sinus seems to play an important 

 part in the respiratory function. 



The nephridia, though seeming to be similar in their arrangement to those of 

 Pontobdella, were not clearly made out in sections available. 



The nervous system differs from that of the preceding two species in so far as 

 the anterior ganglionic mass contains a ganglion more than ordinal. The cephalic 

 ganglionic mass lies in somite VII, consisting, as in the case of Ancyrobdella, of 

 seven ganglia, this is apparently due to the addition of the seventh ganglion. The 

 acetabular mass is, as usual, composed of seven ganglia. Between these masses 

 there are twenty ganglia which are metamerically arranged and joined by paired 

 connectives. The ordinal position of the ganglion is in the middle of each somite. 

 In the posterior end of the body, however, there can be noticed a slight centripetal 

 displacement of the ganglia. 



The common genital aperture lies in somite XI, directly leading into the wide, 

 upwardly directed vestibulum of an irregular contour, which receives the male duct 

 from the front as well as the oviduct from behind. 



There are five pairs of testes, lying immediately in front of the five pouches of 

 the crop ; they are placed intermetamerically, as in the preceding two species, in 

 somites ^^-^= . The testes on each side communicate by short vasa efferentia 

 with the vas deferens pursuing a tortuous course. In its course this duct becomes 

 gradually dilated into a thick- walled glandular canal, which in front of the genital 

 opening enters a large muscular, thick-walled and gland- covered "prostate," which 

 soon unites with its fellow into a common duct, passing upwards and then backwards 

 dor sally to open into the vestibulum. 



