UF THE COMMON NEMATODE OF THE DOGFISH. 



451 



The body is slightly attenuated towards the anterior end, and 

 the head (text- fig. 1) is chai-acterized by the presence of a 

 peculiar cnticnlar collar. It was probaV)ly the presence of this 

 collar which sni>a;-ested to Van Beneden his generic name 



J. 



Al.C. 



a 



a a 

 ci. 

 c.w. 

 I. 



L. 



L.BJ 

 L.S. 



-hc.c 



—Oes. 



N.R. 



Head of Fi^nleptiis scillicola. 



Letteeing of Figures. 



Anus. 



Alimentary canal. 

 Cuticle. 



Cuticular collar. 

 Cloaca. 



Cuticular wing. 



Intestine. 



Lips. 



Left bursal wing. 

 Large si^icule. 

 Nerve-ring. 



Oes. 

 Ov.D. 

 P. 

 B. 



B.B.W 



B.G. 



S.S. 



u. 



V. 



Gilsopluigus. 

 Oviduct. 

 Papilla?. 

 Rectum. 



Right bursal wing. 



Rectal gland. 



Small spicule. 



Uterus. 



Vulva. 



Vagina. 



Coronilla. There are two rounded, protruding, lateral lips, each 

 of which bears a single conical tooth. Linstow (9) mentions in 

 addition " interioi'ly a. small pointed cone,*' but 1 have failed to 

 find any evidence of tiiis either in whole mounts or sections. 

 The excretory pore is exceedingly small, and is situated in the 



