CENTROPYGUS JOSEENSIS 



245 



Text-fig. 1. 



tion he described the smaller of these specimens as C . c o c - 

 c i n e a . He laid stress on the fact that apart from size he could 

 distinguish no difference in the specimens : the form, number 

 of annuh, and the position of the genital pores were the same, 

 small variations occurring 

 in the number of annuli, as 

 was already mentioned by 

 Kennel (1886) and Blan- 

 chard (1896). 



Kennel (loc. cit.) separated 

 the species C. coccinea 

 from C . j s e e n s i s for the 

 following reasons : in C . 

 coccinea the size is 

 smaller, the ovaries lie ven- 

 tral to the gut, between it 

 and the nerve-chain, and 

 the anterior part of the mid- 

 gut has no blind sac at its 

 transition into the mid-gut, 

 w'hereas in C . j o s e e n s i s 

 as well as the greater size 

 of the leech, the ovaries lie 

 under the lateral blood- 

 vessel and a blind sac is 

 present. He admits that all 

 the specimens of C . coc- 

 cinea he examined were 

 sexually immature, but does 

 not think that this would 

 account for the differences 

 enumerated. To determine the position of the specimens 

 I dissected one, and cut serial sections of another, and I will 

 be able largely to confirm Kennel's work and bring it up to 

 date, especially as regards the relations of the ganglia and 

 annuli, and to add certain new details. 



Lateral view of C . j o s e e n s i s from 

 a preserved specimen 42 mm. long. 



