146 XEROPHILA VIRGATA. 
2,3, 4,5 unequal terminal branches ; the PENIS SHEATH short and narrow, but 
dilated basally, separated by a distinct flexure from the long and fusiform more or 
less twisted and whitish EPIPHALLUS ; the FLAGELLUM is short and subulate ; the 
PENIAL RETRACTOR attached near the point of junction with the epiphallial tract. 
Be 
= 
a 
Fic. 224. Fic. 226. Fic. 226. 
Fic. 224.—Reproductive system of A. w/7gata (Da Costa), Christchurch, Hants., x 2. 
a.gl. albumen gland; d.s. stylophore or dart-sac; ef. epiphallus; 77. flagellum; m.g/. mucus 
glands ; o¢. ovotestis continued as the hermaphrodite duct to the vesicula seminal at its junction 
with the ovispermatoduct; ov. oviduct; #.s. penis-sheath; 7. penial retractor; s.d. sperm-duct ; 
sp. spermatheca ; v.d. vas deferens. 
Fic. 225.—Ovotestis and hermaphrodite duct, showing the cecal arrangement, xX 9. 
Fic. 226,—Vesicula seminalis, showing its connection with the hermaphrodite duct and with the 
ovispermatoduct, x 9, 
The STYLOPHORK or dart-sae is a large and broadly oval sac, fused throughout 
most of its length to the vagina ; it is yellowish-white in colour, and occasionally 
presenting the atavie feature of a notched or cleft apex, suggesting a probable mode 
of origin of the accessory sac from a degenerating dart sac. 
Internally, the inner sheath of the sac tapers to an acute point, and the dart is 
difficult to dissect therefrom. In continental XY. variabilis and X. maritima this 
bifureation of the dart sac is much more frequently present than is usual in English 
specimens, but is by no means invariably found. 
ee 
} 
aie \ i 
a A 
-_ 
Fic. 227. Fic. 228. Fic. 229. Fic. 230. Fic. 231. 
Fic. 227.—Reproductive organs of X. vartadilis Drap. (after Schuberth). 
Fic. 228.—Gypsobelum of X. variadilis Drap., greatly enlarged (after Schuberth). 
Fic. 229.—Gypsobelum or Love-dart of \. wvixgata Da Costa, x 12. 
Fic. 230.—Section through the apex of the Gypsobelum of A. wixgata Da Costa, x 12. 
Fic. 231.—Enlarged view of the flanged apex of the Gypsobelum, x 20. 
The GYPSOBELUM or love-dart is from 2-3 mill. in length, and is the sole British 
representative of a peculiar type remarkable for its heavy shaft, which increases 
gradually from point to base, and furnished with two thin, transparent, simple 
edged, angulated blades, the angulation occurs near the apex, and from it the two 
