422 
Argas persicus 
Fig. 4. Transverse section through the antero-ventral part of the accessory gland, 
showing the structure of the median granular lobe and the posterior spongy lobes. 
Magn. 260 diam. 
Fig. 5. Sections of portions of the median granular lobe (a) and the 2nd lateral granular 
lobe ( b ) of the accessory gland. Magn. 350 diam. 
Fig. 6. (a) Spermatozoan from the seminal vesicle, showing the invaginated condition 
which persists until the spermatozoa are liberated from the spermatophore in the 
uterus of the female, (b) Transverse sections of spermatozoa showing the concentric 
sheaths of deeply-staining cytoplasm. (c) A young spermatid from the testis. 
( d ) Spermatid at a later stage, from the vas deferens, showing the commencement 
of its evolution into the spermatozoan. Magn. 470 diam. 
PLATE XXVIII. Argas persicus. Female. 
Gene’s organ. Two transverse sections through the anterior part of the body, showing 
the relations of Gent’s organ with the external integument. The upper section 
passes through the fold formed by the junction of the dorsal surface of the basis 
capituli with the posterior limit of the camerostome. The lower section is taken at a 
level some distance posterior to the former, but still anterior to the capitular foramen. 
Magn. 115 diam. 
INDEX TO LETTERING ON PLATES XXV TO XXVIII. 
a. d. gr. 1. 
antero-dorsal granular lobe of accessory gland. 
an. 
anus. 
a. s. 1. 
anterior spongy lobe of accessory gland. 
b. c. 
basis capituli. 
hr. 
central nerve mass or “ brain.” 
hue. can. 
buccal canal. 
hue. cav. 
buccal cavity. 
cam. 
camerostome. 
cam. f. 
camerostomal fold. 
cc. al. 
alimentary coeca. 
c. g. com. 
ductus ejaculatorius. 
ch. 
chelicera. 
ct. 1. 
chitinous lining of vagina. 
ct. s. 
chitinous sac of Gene’s organ . 
ct. s'. 
thickened S-shaped folds of chitinous sac of Gene’s organ. 
cx. 1-4 
coxae 1-4. 
cx. f. 
coxal fold. 
d. a. s. 1. 
efferent duct of anterior spongy lobe of accessory gland. 
d. ov. 
oviduct. 
d. p. s. 1. 
efferent duct of posterior spongy lobe of accessory gland. 
end. 
endosternite. 
ep. ov. 
ovarian epithelium. 
ep. ut. 
epithelial lining of uterus. 
ep. vg. 
epithelial lining of vagina. 
ex. ct. s. 
indicates the space, external to the chitinous sac of Gene’s organ, 
which communicates directly with the exterior. 
