Fig. 
Fig. 
Haswett—A Monograph of the Temnocephalee. 151 
Pate xi. 
1.—General view of the dorsal nerve-plexus as seen in a young specimen of Zemnocephala fasciata, 
with the origin of the nerves given off to the tentacles. 
2.—Eye of 7. minor as seen in fresh specimen. 

3.—System of visceral nerves in the pharynx of 7’. fasciata, from a compressed specimen stained with 
methyl green. m., median ; /., lateral longitudinal nerves; 7., radial branches. The dotted 
line, ph., indicates the outline of the pharynx. 
4.—A portion of one of the pluricellular “prostatic” glands as seen in a section of a specimen 
prepared by Flemming’s method. d., duct. 
> glands. x 500. 
5.—Transverse section of the main duct of the ‘ prostate’ 
6.—Branching and anastomosing ducts of the “prostate” glands. x 500 
7. Cirrus of 7. Dendyi protruded through the common genital aperture, from a series of vertical 
longitudinal sections. g.o., points to the genital aperture. 
8.—Cirrus of 7. minor. c., genital cloaca. 
9.—Extremity of cirrus of young specimen of 7. minor. 
10.—Longitudinal section of the cirrus of 7’. guadricornis, showing the three sets of spines. 
11.—The cirrus and adjacent parts of 7. Dendyi from the dorsal aspect x 230 (fresh specimen). 
b., cirrus bulb; c¢., cirrus; e.s., ejaculatory sac; /.g.7., left granule reservoir; 7.g.7., right 
granule reservoir ; /.v.d., left vas deferens; 7.v.d., right vas deferens; 0., male opening into 
genital cloaca; v.s., vesicula seminalis (here not greatly distended) ; ¢., points to the median 
spine. 
PLATE XIII. 
1.—Cells from testis of sexually immature specimen of 7’. Dendy. 
2.—Spherical mass of cells formed by division of primitive cell of testis. 
3.—A stage in the further mitotic division of the testicular cells, 
4.—Final stage in the process of division—the spermatidia. 
5-11.—Successive stages in the development of the spermatozoa. 
. 12.—Heads of spermatozoa of Temnocephala fasciata. 
. 13.—Cirrus of 7. fasciata. 7., introvert ; ¢., genital cloaca. 
. 14,—Cirrus of variety of 7’. fasciata. 
. 15.—Cirrus of 7. comes. e.s., ejaculatory sac (in some specimens a good deal longer than here 
represented) ; 7., introvert. 
g. 16.—Distal extremity of the same, more highly magnified. 
. 17.—Cirrus of 7. Nove-zealandie. 
. 18.—Extremity of cirrus of 7. Vove-zealandic. 
ig. 19.—Cirrus of 7. Jheringii. 
. 20.—Cirrus of 7. Engei. 
