270 



Transactions of the Societij. 



Section 13, so that the 



gizzard 



appears to extend 



through 



SIX 



segments (7-12), as shown in the ilhistration (fig. 20). On the 

 posterior portion of the oesophagus the ealciferous ghmds occur, 



and immediately behind these, in seg- 

 ment 18, or possibly 19, the wide intestine 

 opens out, lined with a very moderate 

 typhlosole. The segments behind the girdle 

 have not been studied. 



The nervous system is normal. One 

 observes that the nerve-cord narrows at each 

 intersegment, and this fact is often of great 

 assistance in determining the number of a 

 given segment ^s'hen the septum is wanting, 

 or is pushed out of position by the crowding 

 of the organs. 



The nephridia are of the microscopic 

 type, and seem to commence in segment 

 12/13. I have been unable to discover 

 their pores or funnels, and they are in every 

 way different from the corresponding organs 

 in the Enchytrseids, which I have studied 

 most fully. 



The vascular system seems to differ from 

 the type. I find the blood-vessels very 

 large in segments 12, 13, 14, but there are 

 lesser "hearts" in 15 and 16. The system 

 was not studied in the living worm, and 



such details as it is 

 show capillaries in 



Fig 



reference must be made to the drawings : 



possible to portray. Longitudinal sectio 



the epidermis. In some of my sections they appear to be specially 



large and numerous in the 6th segment. 



IV. — Kelative Position of Dichogaster lageniformis. 



I confess to having considerable difficulty in finding the exact 

 place which the new worm fits. It may be asked in the first 

 instance — Is it a Dichogaster at all ? So far as the setse, extent 

 and position of the clitellum, gizzard and oesophageal glands are 

 concerned it agrees with the original type. The testes and ovaries 

 are also in the normal position, but this would apply to all the 

 genera of the family, D. damonis, the type, has only- one pair of 

 spermathecse, but the more recent diagnosis allows of either one 

 or two pairs. In the type one finds the sette of certain segments 

 missing, there are vesicula3 seminalis of a special kind, each 

 oviduct opens separately instead of being fused, and the salivarj^ 

 glands in the anterior segments seem to be confined to the first 

 three segments. 



