BY N. A. COBB. 411 



YIII. Synonchus, new genus. 



The worms constituting this genus are also related to Oncho- 

 laimus. They have a pharynx armed with teeth of which the dorsal 

 is prominent and the submedian rudimentary. The pharynx is so 

 small that the teeth occupy most of the available space when the 

 mouth is closed. The oesophagus contains the three glandular 

 structures first seen by Marion in the cesophagus of Enoiylus, and 

 afterwards fully described and elucidated by de Man in Oncho- 

 laimus. In Synonchus the dorsal gland has the peculiarity of 

 emptying into the lumen of the oesophagus at some distance from 

 the mouth, a fact which adds weight to the opinion that these 

 organs are salivary glands. The only other function that has 

 occurred to me as possibly assignable to these organs is that of 

 secreting a venomous fluid. The sexual organs, so far as known, 

 are symmetrical in both sexes. The males possess a ventral 

 accessory organ in front of the anus. I failed to find in the only 

 female examined the tubular organs discovered by de Man in the 

 females of Oncholaimus. 



, ^ 2- 5-7 19- '60'^^ 97- 



1. S. FASCICULATUS, n.sp, -g \-2 r8 Ti ^ 8-8 mm. is the 



formula for the only female seen — probably a smallish one. The 

 subcuticula is very finely transversely striated. Short hairs occur on 

 all parts of the body, but near the head they are particularly abun- 

 dant and are arranged in a fasciculate manner. The conoid neck 

 terminates anteriorly in a truncate head, surrounded opposite the 

 base of the narrow pharynx by the usual row of ten cephalic setse, 

 — one on each lateral line and two on each submedian line, all of 

 about equal length, namely, one-third as long as the head is wide. 

 The three lips are rather indistinct, but plainly they close together 

 over the pharynx, which presents a single sharp dorsal tooth 

 half-way up and two rudimentary teeth at the base. The dorsal 

 salivary gland empties into the lumen of the oesophagus at one- 

 fourth the distance from the mouth to the nerve-ring. The 

 oesophagus is at first one-half as wide as the neck and gradually 

 enlarges until finally it becomes two-thirds as wide as the neck. 

 The cardiac collum is distinct. The thick-walled intestine is 

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