302 WILLIAM A. HASWELL. 



PLATE XXII. 



Fig. 1. — Transverse section through the brain ganglion ofTemnocephala 

 fasciata. 



Fig. 2. — Transverse section of a portion of the ventral nerve. 



Fig. 3. — Longitudinal section of nerve-fibre from dorsal nerve-plexus. 



Fig. 4. — Elements of testis. 



Fig. 5. — Penis and penis-sheath of Temnocephala fasciata. cl. Genital 

 cloaca, sh. Penis-sheath, gl. Terminal enlargement of " glans." 



Fig. 6.— Transverse section of the distal end of the penis of Temnoce- 

 phala fasciata, through the "glans." sh. Sheath, sp. Inverted chitinous 

 spines. 



Fig. 7. — Oblique section through spermatic reservoir, penis, and penis- 

 sheath of Temnocephala fasciata, from a horizontal section of the body. 

 cl. Genital cloaca, sh. Sheath, ej. Spermatic reservoir (ejaculatory duct). 



Fig. 8. — End of penis of Temnocephala quadricornis. 



Fig. 9. — End of penis of Temnocephala minor. 



Fig. 10. — End of penis of Temnocephala novEe-zelandiae. 



Fig. 11. — Ovary of Temnocephala fasciata. 



Fig. 12. — Transverse section of the oviduct ofTemnocephala fasciata. 



c. m. Circular layer of muscle. I. m. Longitudinal layer of muscle, p. In. 

 ternal homogeneous substance, f. Investing reticulum of fibrous tissue. 



Fig. 13. — Vertical section of the wall of the uterus in the same species, 

 with the shell-glands and their ducts, s. gl. Shell-glands, d. Ducts, d'. 

 Terminal enlargements of the ducts, m. Muscle, p. Thin internal homo- 

 geneous layer. 



Fig. 14. — Oblique section of uterine wall nearly parallel with the surface, 

 showing the terminal dilatations of the ducts of the shell-glands with the 

 investing plexus of muscular fibres. 



Fig. 15. — Outline of the ventral part of the vitelline glands of Temnoce- 

 phala fasciata. i. Outline of the wall of the intestine. 



Fig. 16.- Section through a lobule of the vitelline glands, m. Investing 

 layer of muscular fibres, v. Vacuoles in the protoplasm of the gland- cells. 



Fig. 17. — Portion of a transverse section of a young specimen of Temno- 

 cephala fasciata, just behind the pharynx, c. Cuticle, e. Epidermis. 

 b. Basement membrane. I. m. Longitudinal layer of muscle, v. I. m. "Ventral 

 longitudinal layer of muscle, par Parenchyma, with subcutaneous glands. 



d. v. m. Dorso-ventral bundles of muscular fibres, d. I. n. Dorso-laterai nerve. 

 v. n. Ventral nerve, int. Intestine, te. Anterior end of testis. 



Fig. 18. — Eggs of Temnocephala fasciata. Magnified. 



Fig. 19. — Opening of the vagina of Temnocephala novse-zelandise. 



