1907-] Records of the Indian Aluseum. 25 1 



the same thing ; and if I am justified in interpreting his figures in 

 the above manner we have, probably, throughout the Indian 

 species, the development of a zone of budding behind the eighth 

 segment, and consequently a normal length for the animal some- 

 what greater than this, though separation may be delayed and 

 the typical single individual may possibl}^ in some species never, 

 or hardly ever, be met with in practice. 



The chief differences exhibited by the Indian forms appear to 

 be the following : The suckers of some forms are instances of adap- 

 tation ; anterior and posterior are described in C. hengalcnsis, 

 anterior only in C. spongilla. The number of setae in a bundle is 

 greater in C. hengalensis than in the other forms. The first pair 

 of nephridia are larger than the others in C. bengalensis and C. sp. ; 

 the first nephridium appears to be in the sixth segment in C. bengal- 

 ensis, in the seventh in the others (not mentioned in the account of 

 C. spongilla). The nerve ganglia of C. bengalensis and C. spongillcs 

 are described as being of a discrete nature, not corresponding in ar- 

 rangement with the segmentation of the body ; while in the Punjab 

 species the ganglia and segments correspond posteriorly at least ; 

 if in C. pellucidiis the lateral branches of the anterior portion of the 

 cord be taken to represent the number of fused ganglia, then here 

 also we have a larger number of nervous segments than of body- 

 segments. 



