PARASITOLOGY. 151 
TRICHOTRACHELIDAE. 
The family Trichotrachelidae includes a group of 
blood sucking worms, provided with a nude head: 
in the adult state they infest the intestinal tract. 
(Trix—a hair) 
TRICHOCEPHALUs DEPRESSIUSCULUS (Cephale—head) 
(Depressus depress) 
Synonym.—Whip worm. 
Distribution. — Found occasionally in the United 
States, also in Europe. 
Description.—This worm in shape resembles the 
old fashioned “black snake’? whip; the posterior 
part of the body is about the calibre of a thread; the 
anterior two-thirds is attenuated, resembling a hair; 
it is white in color; its mouth is nude; the large part 
of the body of the male forms a coil ; the correspond- 
ing part of the female is straight or slightly curved; 
the male is provided with a spicula; the vulva of the 
female is located in the anterior 
ra vA portion of the large part of the 
2 body; the male measures from 
one to one and one-fourth inches 
a@@4 — in length; the female from one and 
one-fourth to one and one-half 
Fig. 59— inches. 
halus Depres- ; ; 
pipienecy pease Life History.—The ova, placed 
/ 
1, Female. in water and kept at a warm tem- 
2, Male, ; 
‘ Cantaie extremity, erature will hatch and develop 
b, Caudal is complete embryos in from four to 
five months; if these te fea to 
dogs they develop to the adult stage; drying or 
desiccation of the eggs or embryos stops their de- 
