378 ALFRED GIBBS BOURNE. 
PLATE 24. 
Moniligaster grandis. 
Fic. 15.—Ventral view of the head end. Segments numbered 1—xv. 
7. s. Inner setacouples. cl. Clitellum. Sp. apt. Spermathecopore. ¢. Male 
pore. 9%. Oviducal pore. The prostomium entirely withdrawn. 
Fie. 16.—Lateral view of the head end. Segments numbered 1—x!. 
a. & to 2. 11. Nephridiopores. o. s. Outer seta couples. pr. Prostomium 
fully extended along with the buccal membrane. Sp. apt. and ¢ as before. 
Fic. 17.—Diagrammatic vertical longitudinal section of the anterior Seg- 
ments I—xIv. The italic roman numerals ///—XJ/J are placed in the 
cavities of the several segments. 7/8—12/13. Septa bounding various seg- 
ments. pr. Prostomium. m. Muscular pad in the dorsal wall of the pharynx. 
Sal. gl. Salivary glands. Sp. Spermatheca. Cop. Copulatory pouch. Sp. apt. 
Spermathecopore. Sp. sac. Sperm-sac. 7. Testis. f. “Ciliated rosette.” 
V.d. Seminal duct. @. Male pore with the prostate and atrium. Ov. 
Ovary. 9. Oviducal pore with the oviduct. Ovs. Ovisac. 
Fic. 18.—Ordinary epidermis. Cz. Cuticle. Zp. Unmodified epidermis 
cells. god. Gland-cells. 
Fie. 19.—Clitellar epidermis. §. c/. Short club-shaped cells. 7. e/. Long 
club-shaped cells. 
Fie. 20.—Epidermis cells from the neighbourhood of the genital apertures. 
Fic. 21.—Epidermis cells from an intersegmental groove. 
Fic. 22.—The gizzard in longitudinal section. The septa bounding Seg- 
ments XVIII—xxII are indicated. giz. The annular muscular bands. muse. 
The outstanding muscle fibres. Oe. The soft-walled portions between the 
annular muscular bands. 
Fic, 23.—Surface view of a portion of the gizzard to show the outstanding 
muscle fibres. Letters as before. 
Fic. 24.—From a longitudinal section of the intestinal wall in the region 
of the tubular glands. g/. The glands; the section passes through the aper- 
ture of one into the intestine. Cal. ep. Ceelomic epithelium. A/. ep. Intes- 
tinal epithelium. V. Blood-vessels. (Leitz, ocular 3, obj. 3, cam. luc.) 
Fic. 25.—Longitudinal section at the anal extremity to show the thick- 
ened septa. Hp. Epidermis. /. ep. Rectal epithelium. Sept. Septum. 
At aa. is the anus. 
Fic. 26.—A seta couple. One being a little more bent over than thie 
other, appears a little shorter, 
