PARASITOLOGY. 125 
slightly tapering towards the extremities. Length of 
male up to 12 mm., female up to 14. mm. Head con- 
tinuous with the body. Tail of female appears as 
though it was cut off obliquely. See figures 37, 38 
and 39, Plate 11, and 43 and 44, Plate 11. 
Cylichnostomum poculatum—Body delicate and 
slender. Length of male up to 8 mm., female up to 
10 mm. Head not separate from the body. Esopha- 
gus long. Lateral head papillae prominent. See fig- 
ures 51, 52 and 53, Plate 12. 
Cylichnostomum calicatum.—A very small worm. 
Body delicate and slender. Length of male up to 6 
mm., female up to 8 mm. Head slightly narrowed, 
esophagus short. See figures 60, 61 and 62, Plate 12. 
Cylichnostomum alveatum—Length of male 10 
mm., female 13 mm. Thickness of male, .43 mm., 
female, .6 mm. See figures 48, 49 and 50, Plate 12. 
Cylichnostomum catinatum.—Head slightly thick- 
ened, esophagus short and thick. Length of male up 
to 8 mm., female 9 mm. See figures 54, 55 and 56, 
Plate 12. 
Cylichnostomum nassatum.—Length of male up to 
10 mm., female up to 14 mm. Thickness of male up to 
.3 mm., female up to .7 mm.  Submedian papillae 
moderately long. See figures 34, 35 and 36, Plate 11. 
Cylichnostomum radiatum.—Length of the male up 
to 11 mm., female up to 14 mm. Submedian head 
