4 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



lateral lobes and a smaller dorsal lobe. The ventro- ventral and lalero- 

 ventral rays are widely separated and divergent, the latero-ventral 

 ray being longer than the ventro-ventral and extending to the edge 

 of the bursa; externo-lateral ray slightly thicker than the other 

 rays; medio-lateral ray relatively thiclv and extending almost to the 

 edge of the bursa; externo-lateral ray short and divergent; externo- 

 dorsal ray slender; dorsal ray cleft almost to the base, forming two 

 branches which in turn give off a lateral branch near the origin of 

 the primary branch. (Fig. 9.) Prebursal papillae present. The 

 spicules are tubular, pointed, and 385/x long by 16/^ wide at the base. 

 Gubernaculum absent. The telamon (fig. 10) is feebly chitinized 

 and elongated ; its anterior end pointed and embedded in the ventral 

 wall of the cloaca; the lateral edges are inrolled, forming a tube 

 through which the spicules pass; slightly caudad of the middle of 

 the telamon a slender lateral process is given off which appears to 

 furnish attachment for muscles. 



Feinale 8.4 to 8.6 mm. long and 76;u wide at the vulva. The esoph- 

 agus is 350/x long by SO^ii wide at the anterior end and the width 

 increases to 50/^ at the widest portion. The nerve ring is situated 

 210/x from the anterior end of the body. The tail is short and blunt. 

 (Fig. 11.) The anus is situated about 53/m from the tip of the tail. 

 The uteruf; is single and is provided at its distal cud with a strongly 

 muscular ovejector which measures 22(V in length. The vulva is 

 situated about ISO/i, from the posterior end of the body. In some 

 specimens a short, thick, ventral process is present immediately in 

 front of the vulva. Egg 76^ long by 45^'. wide, oval in shape and 

 provided with a thin shell. 



Host. — S.clu t -us carol inensis. 



Location. — Small intestine. 



Locality. — Bowie, Marjdand. 



Type speciviens. — United States National Museum Helmintho- 

 logical Collections No. 27853; paratypes No. 27860. 



This sepcies differs from Ilelig'niostrongylus sedecimradiatus 

 (Linstow 1899) in its smaller size, shorter spicules and dorsal ray. 

 The dorsal ra}' in H. hassalU is not cleft entirely to the base and the 

 lateral branches arise near the bifurcation. In H. sedecijnradiafus 

 the dorsal ray is cleft entirely to its liase forming a double dorsal 

 ray, and the lateral branches are given off about the middle of the 

 primary branches. Travassos (1921) says that a gubernaculum is 

 present in jS. sedecimradiatus^ but from his figure of the bursa of 

 this species the shape and position of tliis structure suggest that it 

 functions as a telamon and that a gubernaculum is absent. 



