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commissures , seen from the dorsal side, and Fig. 2 a lateral view of 

 the same. Br represents the cerebral ganglion, BrN and OeN the 

 branchial and oesophageal nerves respectively, OeC the oesophageal 

 commissure , G the first ventral ganglia with the cross commissures 

 Com connecting them , Vc the ventral nerve cord , and L the lobes 

 in question. The figures are diagrammatic. 



It will be seen that we have here, in reality, two pairs of oesopha- 

 geal commissures. One pair anterior, in the usual position, and the 

 other, the posterior pair, formed by these lobes from the end of the 

 cerebral ganglion. The former are made up entirely of nerve fibres ; 

 the latter, of nerve cells , with only a very few fibres at their posterior 

 end. So far as I could discover, these lobes give rise to no nerves. 



Fig. 1. 



BtX 



Fig. 2. 



BrX 



I have never seen these peculiar lobes described by other obser- 

 vers, and have no suggestions to offer concerning their function. 



Tubiparous Glands. 



The only segmental organs are the tubiparous glands , which lie, 

 one on either side in the first body segment. They open through a 

 common duct , at the end of a little papilla on the extreme anterior, 

 dorsal end of the body, the duct lying in a little channel on the dor- 

 sal side of the cerebral ganglion. 



The glands are very much convoluted, and extend back to about 

 the middle of the second segment. Their external duct rises at the 

 anterior end of the gland , and runs backward for a short distance, 

 uniting with its fellow of the opposite side to form the common exter- 

 nal duct, at a point posterior to its point of origin from the gland. 



