THE STRUCTURE OF CRYPTOGONIMUS 535 
CONCLUSION 
It is not possible in the limits of this paper to make a study of 
the taxonomic relations of this worm. There is no sub-family 
in the scheme offered by Looss ('99) in which it can be located 
at all satisfactorily. Thus the Coenogonominae are small and 
scally, with genital pore close to the ventral sucker, male and 
female ducts united before they reach the surface, prostate free in 
the parenchyma at the end of the seminal vesicle, and no copu- 
latory organ, all of which features are found in Cryptogonimus, 
but they have small neck, mobile body, testes elongate in trans- 
verse axis, receptaculum seminis large and resembling the ovary, 
uterus windings not passing behind the testis, and are found in the 
small intestine of warm blooded animals. Other assignments also 
offer difficulties. If we are guided by the simple condition of 
the copulatory organs with prostate free in the parenchyma and 
close relation of genital pore and ventral sucker as well as the 
presence of large anteriorly forked excretory cavities, then we are 
drawn toward Microphallus (Ward '94 and '01), though the 
anatomy in man^^ points is so different , as in the small size of the 
oral sucker, the rudimentary state of the intestine, presence of 
copulatory organ, location of ovary anterior to testes, totally 
posterior location of the vitellaria and their quite different and 
compacted form. Only after an extended study of the difficult 
problem of distome relationships would it be possible to form any 
conclusions as to the relationships of this form. I have accord- 
ingly left the discussion of the problem of taxonomic position 
for a later paper. 
BIBLIOGRAPHY 
FiscHOEDER, F. 1903 Die Paramphistomidae der Saugethieie. Zool. Jhrh. 
Syst., vol. 17, pp. 485-660. 
Jagerskjold, L. a. 1900 Levinsenia pygmaea, Lev. ein genital-napftragende 
Distomum. Centr. f. Bakt. ii. Pasasitenkunde, Bd. 27. 
Looss, A. 1894 Die Distomen iinserer Fische und Frosche. Bibliotheca Zoo- 
logica, Hft. 16. 
1899 Weitere Beitrage zur Kenntniss der Treraatoden-Fauna Aegyp- 
tens. Zool. Jhrb. Syst. Bd. 12. 
