HELMINTH PARASITES OF BIRDS — DENTON AND BYRD 189 



fairly prominent liplike projection; it measures 0.30 to 0.50 mm. in 

 diameter. Acetabulum large, 0.55 to 0.84 mm. in diameter, muscular, 

 with deep cup-shaped lumen, situated at junction of anterior and 

 middle body thirds. Ratio of diameter of oral sucker to acetabulum 

 1 : 1.5 to 1 : 2. Pharynx globular, 0.14 to 0.24 mm. in diameter. Eso- 

 phagus short, 0.15 to 0.20 mm. long, somewhat thickened and ap- 

 parently glandular, bifurcating one-third to one-half the distance 

 from oral sucker to acetabulum. Ceca fairly wide, slightly sinuous, 

 passing dorsal to lateral margins of testes and terminating about one- 

 third the distance from ends of vitellaria to posterior end of body. 

 Excretory system like that of G. icteridorum, with the exception that 

 the common collecting tubules pass ventral to inner margins of testes, 

 and these divide into main collecting tubules at ventromedial margins 

 of the male organs. Genital pore median, at about posterior level of 

 pharynx. Testes rounded, large, 0.25 to 0.77 mm. in greatest diameter, 

 situated directly opposite, with zones partly overlapping caudal bound- 

 ary of acetabular zone. Vasa efferentia arising from anterior margin 

 of testes and passing anteriorly and medially to unite at entrance into 

 cirrus pouch. Cirrus sac elongated oval, 0.33 to 0.66 mm. long by 

 0.12 to 0.19 mm. wide, usually lying entirely anterior to acetabulum, 

 containing convoluted seminal vesicle, ejaculatory duct surrounded by 

 prostatic gland cells and eversible cirrus. Ovary transversely oval, 0.30 

 to 0.37 mm. in width, usually situated near middle of body. Seminal 

 receptacle small, located just posterior to ovary. Mehlis' gland medial, 

 just posterior to ovary, at one side of seminal receptacle. Laurer's 

 canal present. Vitellaria composed of numerous medium-sized fol- 

 licles, mainly extracecal, extending for a distance of 1.73 to 2.28 mm., 

 beginning near anterior level of testes, ending about two-thirds the 

 distance from acetabulum to posterior end of body. Vitelline ducts 

 arising at about middle of the vitellaria. Uterus much convoluted, 

 filling most of posttesticular region of body, then following a wavy 

 course to genital pore. Mature ova dark brown, 27 /u. to 31 /x long by 

 19 /t to 21 /x wide, fully embryonated when oviposited. Miracidium as 

 in C. ictemdormn. 



Host. — Gorvus hrachyrhynchos Brehm. 



Habitat. — Gall bladder. 



Localities. — Texas: Clodine (type), and Sealey. 



Molluscan host. — BuUmulus altematus mariae (Albers). 



Type specimen.— U.S.'^.'M. Helm. Coll. No. 36747. Additional 

 specimen. No. 36748. 



Remarks. — G onspicfmi'm m^acrorcMs is described from 47 mature 

 specimens from the gall bladder of 4 of 10 crows, Gorvus hrachyrhyn- 

 chos.^ examined from Clodine and Sealey, Tex. Individual hosts 

 harbored 6, 8, 8, and 25 worms, respectively. Crows examined from 



