WILLIAMS: BOOPHILUS ANNULATUS. 
333 
behind the salivary gland complex. A section across a testis (pi. 
22, fig. 24) shows five masses of cells (“follicles,” Griffith, ’92, p. 
439) loosely bound by connective tissue. These cells show very 
large nuclei and are probably the sperm mother-cells. The space 
between the follicles and the vasa deferentia contains, here and 
there, the same elongate cells which fill the seminal vesicles and 
which have been assumed to be immature sperm. 
Finally the three systems, digestive, female reproductive, and 
renal, are put together diagrammatically in text figure C. Each 
system occupies approximately its relative position and shape. The 
salivary glands would lie under, around, and over the lateral por¬ 
tions of the alimentary and renal systems, but to avoid complexity 
the main salivary ducts only are shown. 
Summary. 
The external porose areas on Boophilus are sense organs with 
sensory cells in the openings through the cuticula. This cuticula is 
also perforated by the openings of numerous multicellular glands 
and hairs. 
The alimentary canal is a slightly curved tube passing through the 
brain and with six large diverticula which occupy most of the body 
cavity in immature females and males, and are evidently the impor¬ 
tant digestive regions. 
The triangular, heavily stained cells in the walls of these diver¬ 
ticula are suggested as the functional “liver” cells rather than the 
pigmented cells figured by Pagenstecher. 
The salivary glands are paired racemose glands emptying into the 
mouth cavity. 
The excretory system is modeled after the alimentary canal with 
main diverticula following those of the digestive system and all con¬ 
necting with a renal sac. 
Adult females probably take in little food and eject nothing from 
the alimentary canal or the renal system. 
There is evidence in one case of what may be a simple heart. 
The female organs differ in every detail from those of Ixodes 
ricinus. The ovary in Boophilus is a continuous loop from one ovi¬ 
duct to the other, passing backwards around the main alimentary 
canal. 
