CENTROPYGUS JOSEENSIS 



251 



of the anterior part of the mid-gut, ])ut I have seen it coming 

 off on the left in a specimen of 60 mm. 



In structure the bhnd-gut resembles the anterior part of the 

 mid-gut, of which it appears to be a backward prolongation, 

 but no lymph spaces surround it and its circular musculature 

 is better developed (Text-fig. 9, B.g.). 



The mid-gut extends from the 20th somite to the beginning 

 of the 24th somite ; it is not surrounded by a lymph space 



Text-fig 



Transverse section of Centropygus joseensis at the level 

 of the male opening, showing the junction of the two horns of the 

 termmal portions of the ejaculatory duct to form the spermato- 

 phore sac and parts in relation thereto. (x30,) A.g., anterior 

 gut. Ne.c, nerve-cord m ventral lacuna. Ej.d., ejaculatory duct. 

 Ej.d.t., terminal portion of ejaculatory duct. Sf.s., spermato- 

 phore sac. B., male bursa. 



like its anterior part, ki its termination on the 24th somite 

 there is a sphincter which separates it from the hind-gut. 

 The anus is placed above the 27th nerve ganglion. 



Eeproductive System. 



There are ten pairs of testes, a pair being placed within the 

 1st and 2nd annulus in each somite from the 16th to the 2.5th 

 (Text-figs. 4, 5, T.^, &c.). Kennel (loc. cit.) states that he has 

 found twelve pairs of testes, but in my serial sections of a 



