250 CHARLES BADHAM 



The total number of annuli \aries from 102 to 104. In all the 

 male pore is placed between the 31st and 32nd annulus, and 

 the female between the 33rd and 34th annulus (Text -fig. 2). 



Alimentary System. 



The mouth placed at the base of the spoon-shaped anterior 

 sucker is bounded in preserved specimens by two well-marked 

 lobes, which abut on the ventral ends of the 5th annulus 

 (Text-fig. 2). These lobes are a very characteristic feature in all 

 the preserved specimens 1 have examined : but an examination 

 of sections leads me to believe that they are partly of an 

 oedematous nature— several longitudinal folds furrow the 

 conca\ ity of the anterior sucker. 



The pharynx has a well-de^'eloped musculature of longi- 

 tudinal circular and radial fibres, and from it the oesophagus 

 extends and passes into the anterior gut winch in its turn gives 

 place to the anterior portion of the mid-gut in the 14th somite. 

 There is a narrowing of the lumen at this point caused by 

 convolutions of this part of the gut. The anterior part of the 

 mid-gut extends to the 21st somite ; its relations to other 

 structures, the sphincters surrounding it, and the bhnd-gut 

 which arises from it are shown in Text-fig. 4 (Sj^h.-^.^, E.g.). 



These last two features— the sphincters and the blind-gut— 

 are of considerable importance in distinguishing C. j o s e e n s i s 

 from C. coccinea. There are five sphincters, one placed 

 at the end of each somite from the 15th to the 18th ; the 5th 

 sphincter is in the 21st somite immediately behind the blind- 

 gut (Text-fig. 4, Sjjh.j^.^). Each consists of a layer of circular 

 muscle-fibres surrounding the gut ; in preserved specimens, being 

 relaxed, they produce little constriction. The sphincter in the 

 21st somite is particularly well developed. 



Another feature of systematic importance is the development 

 of a single blind-gut which occurs in C. j o s e e n s i s but not 

 in C. coccinea. This is given off' at the termination of the 

 anterior portion of the mid-gut in the 21st somite ; it extends 

 to the 24th somite, lying to the right of the mid-gut. 

 Kennel (1886) figures the blind-gut as coming off on the right 



