562 
Fig. 8. 
REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
EXPLANATION OF PLATES. 
PLATE 63. 
Monobothrium terebrans sp. nov. 
. Adult; a, head; b, posterior end; ¢, genital pore, x 34. 
Smaller specimen, dorsal view, X 18. 
Posterior end of adult, ventral view; a, genital pore, x 14. 
Small specimen, dorsal view, xX 14. 
Anterior end of adult, marginal view, x 14. 
. Anterior end of adult, dorsal view, x 14. 
Posterior end of adult, dorsal view, X 14. 
Posterior end of adult, marginal view, x 14. . 
Figs. 5 to 8 are sketched from the same specimen, 
Fig. 9. Median longitudinal section of anterior end of small specimen, parallel 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 17. 
Fig. 18. 
with a dorsal surface, 200. 
Transverse section near apex, of small specimen; c, cuticle; w, vessel of 
water-vascular system, X 200. 
Egg, sketched from ‘section of young specimen, showing eggs in the 
uterus, X 375. 
Egg, from one of the posterior convolutions of the uterus of a young 
specimen; a, germ cell; the remainder of the contents consists of 
globular masses from the vitelline gland, X 375. 
Longitudinal section through the posterior region of a small specimen; ¢, 
cuticle; ci, cirrus and cirrus-pouch; e, epidermis; g g, marginal lobes 
of germ gland; Im, longitudinal muscles; 0 0, eggs in posterior con- 
volutions of the uterus; sc, subcuticular fibro-granular layer; t, testes; 
wu, uterus; v, seminal receptacle of vagina; vd, vas deferens; vg vg vg, 
marginal and posterior vitelline glands, x 300. 
PLATE 64, 
Monobothrium terebrans sp. nov. 
Longitudinal section through the posterior region of an adult specimen, X 
60; uw, shell gland; other letters as in Fig. 13. 
Diagrammatic sketch showing position of genitalia; v, vagina; v’, seminal 
receptacle; g, shell gland; other letters as in Fig. 13. ? 
. Transverse section through body in region of cirrus bulb of adult, x 54; 
1, longitudinal muscles in subcutaneous fibro-granular layer; w, vessels 
of water-vascular system; other letters as in Fig. 13. 
Transverse section of body-wall in front of cirrus, x 210; /, longitudinal 
subcutaneous fibers; other letters as in Fig. 13. 
From transverse section in front of germ gland, x 210; 1, ciliated duct — 
vagina; g, germ gland; Im, longitudinal muscles; 0, egg in uterus; — 
u, uterus. 
Longitudinal section near ventral surface; ci, cirrus; v, vagina, x 300. 
iti. 
