34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



Generic diagnosis. — Heterophyidae : Body ovoid to linguiform in 

 shape. Prepharynx very short; esophagus short; intestinal bifurca- 

 tion nearer to oral sucker than to acetabulum ; intestinal ceca extend 

 into posterior end of body and terminate caudad of testes. Aceta- 

 bulum rudimentary, in anterior wall of the spacious, more or less 

 muscular, genital sinus; genital ducts open into sinus at base of 

 a single papillalike gonotyl ; genital aperture postacetabular, in 

 center of genital sinus. Seminal vesicle well developed, curved in 

 a more or less S-like manner, dorsal to uterine coils. Testes near 

 posterior end of body, irregularly oval or slightly lobed, either side 

 by side or the right testis obliquely behind left. Ovary irregularly 

 oval or lobed, situated to right of median line and cephalad of semi- 

 nal receptacle. Vitellaria fill posttesticular space and extend an- 

 teriorly to acetabulum or beyond. Uterus with few loops, confined 

 to intercecal space between ovary and genital sinus. 



Type species. — Cryptocotyle concava (Creplin, 1825) Fischoeder, 

 1903. 



CRYPTOCOTYLE LINGUA (Creplin, 1825) Fischoeder, 1903 



Plate 9, Figure 36 



Synonyms. — Distoma lingua Creplin, 1825, i^p. 27-38; Tocotrema 

 lingua (Creplin, 1825) Looss, 1899, p. 586; Distomum maci^orhinis 

 MacCallum, 1916, p. 34; Hallum caninum Wigdor, 1918, pp. 254- 

 257. 



Description. — Cryptocotyle: Body linguiform, 550/x to 2 mm long 

 by 200/x, to 900ju. wide. Cuticle covered with scalelike spines, 2/a to 

 4/A long by about 1/x wide. Oral sucker 66/x to 110/x in diameter; 

 prepharynx shorter than pharynx ; pharynx 40/a to SO/x long by 30ju, 

 to 48/A wide. Esophagus short, about 40^ to 60/a long. Genital sinus 

 120/tA to 250ja in diameter, situated near equator of body ; acetabulum 

 rudimentary, in anterior wall of sinus. Seminal vesicle long and 

 coiled in an S-like manner, extending caudally to about the level 

 of the anterior border of ovary. Testes irregularly globular or 

 ovoid in shape, 120/x to 250/i, by 70ja to 130ju,, margins uneven or 

 slightly lobed. Ovary lobed, 70/a to 120/j, long by 140ft to 180fi wide, 

 situated to right of median line; seminal receptacle ovoid in shape 

 and situated caudad of ovar3^ Vitellaria extend anteriorly beyond 

 acetabulum and caudally to posterior end of body. Uterus confined 

 to intercecal space between ovary and genital sinus. Eggs oval, 49ft 

 to 50fi long by 18ft to 2ofi wide. 



Hosts. — Birds {Golynibus aurltus., Gavia iviniev., Larus marinus, 

 L. argentatus, L. fuscus, L. atriciUa, Nycticorax nycticorax.^ Rissa 

 tHdactyla, Alca torda^ Steriui dougalli, S. hirundo) and mammals 



