ON KYNOTUS CINGULATUS. 463 
Fic, 12.—Transverse section of the penial cheetophore near its junction with 
the duct of the spermiducal gland. d.pr. Duct of gland. ch', Sac of the 
functional penial cheta. cir. Coat of circular muscles enveloping these. 
lg. Longitudinal muscles. sh. Sheath. ch?, ch3. Reserve chete. 
Fic. 13.—Transverse section of the penial chetophore lower down, where 
the lumen has opened into the duct of the gland. Letters as in Fig. 12. 
Fie. 14.—The common duct enlarged. Zp. Epithelium. Cuz. Cuticle. Cir. 
Circular muscles. ch!, The penial cheta. Cor. Its cortical, and med. its 
medullary portion. 
Fic. 15.—Transverse section of a prostate. The lumen (/./.) is cut 
through four times, and appears embedded in a mass of gland-cells (pr.). 
ep. Epithelium. sh. Muscular sheath surrounding the whole gland. d.v. Blood- 
vessels. 
Fic. 16.—A portion of the preceding, enlarged. ep. Epithelium.  g/. 
Gland-cells. m. Muscular coat round the epithelium. 
Fie. 17.—Transverse section of the bursa propulsoria and partially protruded 
clasper (Figs. 4 and 5). The section does not go through the most projecting 
region, but rather obliquely through the side (x 35). #B. The protruding 
portion of the clasper. 4. C. The two regions of the bursa; the former lined 
by gland-cells, the latter by columnar epithelium. ep. Epidermis of body- 
wall. cir, Circular coat of muscles. 7g. Longitudinal muscles, m. 
Muscular substance of the clasper. 7. Retractor muscle. 
Fie, 18.—Another section through the same further backwards, so as not 
to involve the pore(X 35). The regions 4. C. are here continuous. Other 
letters as before. 
Fic. 19.—A portion of the epithelium lining the region 4. of the bursa, 
gl. Gland-cells. 4.v. Blood-vessels. m. Muscle-fibres. 
Fic. 20,—A portion of the epidermis of region C. 
Fic. 21.—Portion of the body-wall in the ventral region. Zp. Epidermis. 
b.t. Thick basement tissue. cir. Circular muscles. ct. Connective tissue 
separating the longitudinal muscles (/g.) into bundles, 4.v. Blood-vessel. 
Fic. 22.—Portion of the above sections more highly magnified, to show the 
peculiar basement tissue (4.¢.) with nuclei (#.) embedded in it, and the 
vascularity of the epidermis. 
Fie. 23.—One of the anterior nephridia, showing its peculiar spirally-coiled 
tubule (¢.) and long duct (d.). 
Fic. 24.—One of the posterior nephridia with a cecum (c) to the duct, 
and a different coil to the tubule. 
