WILLIAMS: BOOPHILUS ANNULATUS. 
327 
liar sense organs which deserve further study. A sagittal section 
through one of these is shown in fig. 13 (pi. 20). Each one of the 
slight elevations on the porose area has a pore which extends 
entirely through the cuticula. Below the pores, conical cells are 
seen, some of which project slightly into the corresponding pores, 
very likely in a fresh unshrunken specimen nearly to the surface of 
the cuticula. These cells have fibers at their proximal ends (pi. 20, 
fig. 13, n .), which form a compact bundle and can be traced back¬ 
ward to the connective tissue capsule of the brain. 
As the dorso-submedian porose areas (pi. 18, fig. 3) have exactly 
the same appearance as the porose areas already described, it is fair 
to assume that they also have nerve bundles leading to the brain, 
but these are yet to be demonstrated. 
Female Sexual Organs. 
The greatest difference between Ixocles ricinus as described by 
Pagenstecher, and Boophilus anmdatus is in the sexual organs. 
According to Pagenstecher the plan on which the male and female 
organs are built is much the same. He figures for each, paired 
glandular bodies, testes or ovaries, for the preparation of the sex¬ 
ual products, paired canals leading these products into a common 
receiving and protecting chamber, and an unpaired outlet. 
For the female organs in more detail, he shows in his figs. 6 and 
11, pi. 2, with a large “Vorhof” next the genital pore to which 
muscle fibers are attached. A constricted area into which the 
paired shell glands pour their secretion leads backward from the 
“Vorhof” and widens out to become the large receptaculum 
seminis. At the posterior end of this, again separated by a con¬ 
striction, is the uterus which (Pagenstecher, ’61, pi. 2, fig. 11) 
receives from behind the duct made by the fusion of the two ovi¬ 
ducts. The ovaries lie on each side of this central series of un¬ 
paired chambers and the oviducts lead from the anterior ends of 
the ovaries back parallel with them to the point of fusion into a 
single oviduct behind the uterus. 
The male organs are similar except that the very small testes lie 
forward and the vasa deferentia lead backward from them to the 
posterior end of the seminal vesicles and empty there separately. 
