2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



and stout. The dorsal ray is about 50fi long; about 30;a from its 

 proximal end it divides into two branches, which in turn are cleft 

 at their tips; in the region of the principal bifurcation there are 

 two lateral branches, one on each side. There is the usual accessory 

 bursal membrane supported by two rays. Female: About 8.5 mm. 

 long and 138/x, wide in the region of the vulva. Esophagus, 550/ji 

 to 570/1, long, with the cervical papillae about SlO/x from its anterior 

 end. Combined length of the muscular portions of the ovejectors, 

 including the sphincters, 212/a. Distance from the anus to the tip of 

 the tail, 225/i. About 35/x from the tip of the tail there is a slight 

 bulbar swelling. Eggs, 70/i, to 78/u, long and 38.5ju, to 42.5/* wide. 



Host. — Virginia deer {Odocoileus virginianus) . 



Location. — Abomasum. 



L cality. — Pennsy 1 v ani a . 



Type specimen.— U.S.'^.M. Helm. Coll. No. 29427. 



OSTERTAGIA MOSSl, new species 

 Plate 2 



Specific diagnosis. — Ostertagia — Male: About 7 mm. long and 

 110/x wide just anterior to the bursa. Esophagus, 740/i to 775/i 

 long and 62/i wide at base. Head, 16/x wide. The cervical papillae 

 are situated 320/i, from the head end. The nerve ring is slightly an- 

 terior to the cervical papillae. The spicules are l75/x to 190/i in 

 length and are light yellowish brown; in the posterior fourth they 

 are divided into three processes, one dorsal and two ventral; the 

 dorsal process is straight and ends in a blunt tip; the ventral pro- 

 cesses are sharp; the outer ventral process is the longest and ends 

 in an acute recurved point. There is a distinct paddle-shaped gu- 

 bernaculum, 60/* to 70/* long. The pattern of the rays of the bursa 

 is similar to that of the other members of the genus, except that 

 the dorsal ray, which is, as usual, bifid with split ends, is without 

 any other accessory processes. Female: About 9 mm. long and 92/x, 

 wide in the region of the vulva. Combined length of the muscular 

 portion of the ovejectors, including the sphincters, 285/x to 330/*. 

 The vulva is a transverse slit, naked or covered by a backward-pro- 

 jecting flap. Distance from the anus to the tip of the tail, 170/* to 

 175/1. Eggs, 77/* to 80/* long and 38.5/* wide. 



Host. — Virginia deer {Odocoileus virginianus) 



Location. — Abomasum. 



Locality. — Pennsylvania. 



Type specimen.— X^ .S.'^ .M.. Helm. Coll. No. 29428. 



A NOTE ON OSTERTAGIA LTEATA 



In 1926, Agnes Sjoberg described a new species of Ostertagia from 

 cattle in Austr a. She gave it the name Ostertagia lyrata because 



