328 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
The foregoing description of the female organs of Ixodes would 
fit much better the organs of the male Boophilus than those of the 
female. In Boophilus the female organs are not tandem, one fol¬ 
lowing another, hut the uterus and receptaculum lie one above the 
other. There is no condition in Boophilus like that described for 
the male Ixodes ricinus. 
The sexual opening or genital pore in Boophilus, instead of lying 
between the coxae of the last pair of legs as in Ixodes ricinus, is 
between the coxae of the first pair of legs. In the female Texas 
fever tick the duct leading from the genital pore first extends dor- 
sally and then turns posteriorly. Almost immediately it divides 
into a dorsal and a ventral portion, and a cross section through the 
animal in this region (pi. 21, fig. 17) shows the two chambers, one 
above the other, and the ventral one with its lumen obliterated by 
the muscular contraction. The wall of this passageway is very 
thick and is composed of a heavy ring of circular muscle fibers 
within which the much wider longitudinal fibers are seen (pi. 21, 
fig. 17, rec. semi). 
The two chief rows of dorso-ventral muscles take origin close on 
each side of the genital pore and genital ducts (pi. 21, fig. 17, mu.). 
The dorsal passageway (pi. 21, fig. 17, ut.) is slightly thinner- 
walled with a large lumen, but still with strong circular and longi¬ 
tudinal muscles. 
Fig. 18 (pi. 21), which is seventy-five micra farther back in the 
body, shows that the ventral chamber, which has now widened out 
greatly, acts as the receptaculum seminis, for it is entirely full of 
ripe sperm. 
In this section the walls of the dorsal chamber, the uterus, are 
much thinner and the enclosed cavity is much larger. The dorsal 
wall of the uterus contains no muscular tissue at all and is full of 
nuclei crowded closely together. 
The oviducts are very short. The sac-like receptaculum has its 
posterior corner prolonged on each side into the ovary proper. The 
transition is abrupt. In one and the same section (pi. 21, fig. 18) 
one may see the receptaculum (rec. sem.), the projection on the 
right side which shows the beginning of the oviduct (ovd’t.), and 
the ovary ( oa .). Most of this oviduct lies in the section just 
before this one, but none of the ovary is to be seen in the pre¬ 
ceding section. 
