1907-] 



Records of the Indian Museum. 



243 



ventrally in the ventral vessel. This is not contractile and is not 

 attached to the wall of the alimentary canal. A pair of transverse 

 connecting vessels {v. text-fig. 2) which are contractile are situated in 

 the oesophageal segment in front of septum f . There is a capiUary 

 plexus in the wall of the crop similar to that described in C. 

 'f)uniabensis {v. pi. ix, fig. 10). The blood is colourless and 

 contains no corpuscles. 



Ncphridia. — The nephridia are long, finely coiled tubes, not 

 attached to the septa, and without funnels; no ciliary motion is 

 visible within them. Their position has been described above, 

 and may be seen in the various figures. 



Nervous system. — The cerebral ganglion is situated dorsal 

 to the buccal cavity ; it is indistinctly bilobed, elongated trans- 

 versely, and may appear somewhat nodular in outline. The 

 commissures are continued from its antero-lateral angles. The 

 ganglion frequently contains a quantity of granular opaque matter ; 

 this may be aggregated into an ovoid mass (text-fig. 5 A) in the 



3 ' P 



Fig 5. — A, cprebral ;?anwlion of C. pellncidits. with symmetricnl ovoid granular 

 mass; B, the same, gr.iniil ir niHtt-T mainly unilateral; C. anferiur part of ventral 

 nervc'Curd, in tlie usual somt^what contracted condition of the animal. 



deeper and more posterior part of the ganglion ; or it may extend 

 as scattered granules some distance along the commissures ; or 

 it may be confined to the right (text-fig. 5 B) or left half of the 

 ganglion ; or it may be absent altogether. But even when most 

 closely aggregated, the mass never has the bright shining appear- 

 ance of the refractile particle in the cerebral ganglion of C. punjab- 

 ensis, but is always dark and opaque. 



