A Morphological Study of Strongylus douglasi, Gohhold. 271 
boundary of the ovijector, which is near the bend of the tube. At about 
two-thirds of its length the ovijector passes in a cyhndrical uterus (Figs. 2, 
11), about 230-250 ji in length. This organ is thickened at both ends and 
grips the ovijector like a ring. The muscles of the uterus are oblique, the 
slant being more marked at the two extremities ; in the centre there is a 
tendency to assume a longitudinal direction. 
The uterus communicates with a fair-sized vagina, lined with a 
cuticular membrane. In the close proximity of the vulva the exterior 
cuticle is more or less corrugated (Figs. 2, 11 v.). The vulva is placed 
0-9 mm. in a straight line from the caudal end. 
The shorter genital tube preserves during its whole length the char- 
acter of an ovary (Fig. 10 ov.). 
Cobbold had already observed that the eggs are relatively big and not 
very numerous. On counting those found in the oviduct, in full develop- 
ment and surrounded by a shell, I have found in twelve females a mini- 
mum of fifteen, a maximum of thirty-one, and a mean of twenty-six eggs. 
LITERATUKE. 
Bkaun, M. — Die tierischen Parasiten des Menschen. 3te Auf. Wiirzburg, 
1905. 
Cobbold, T. S. — New Entozoon of the Ostrich. Journ. Linn. Soc, 
London, 1883, vol. xvi., pp. 184-188. 
Looss, A. — The Anatomy and Life-history of Agchylostoma duodenale. 
Dub. Rec. Egyp. Gov. School of Med., 1905, vol. iii. 
Raillet, a. — Traits de Zoologie Medicale et Agricole, 2°"^ ed. Paris, 
1895. 
Robertson, W. — Notes on the Life-history of the Ostrich Wireworm 
Strongylus douglasi. Agric. Journ., Cape Good Hope, 1910, vol. 
xxxvii., pp. 139-149. 
Schneider, A. — Monographie der Nematoden. Berlin, 1866. 
