562 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



EXPLANATION OF PLATES. 



I'LATK (i'i. 



Monohothrium tvrvhroux sp. uov. 



Fig. 1. Adult; a, head; h, posterior end; e, genital ])ore, X 3|. 



Fig. 2. Smaller specimen, dorsal view, X 18. 



Fig. 3. Posterior end of adnlt, ventral view; a, genital pore, X 14. 



Fig. 4. Small specimen, dorsal view, X 14. 



Fig. 5. Anterior end of adult, marginal view, X 14. 



Fig. 6. Anterior end of adult, dorsal view, X 14. 



Fig. 7. Posterior end of adult, dorsal view, X 14. 



Fig. 8. Posterior end of adnlt, marginal view, X 14. 



Figs. 5 to 8 are sketched from the same specimen. 

 Fi"\ 9. Median longitudinal section of anterior end of small specimen, parallel 



with a dorsal surface, X 200. 

 Fig. 10. Transverse section near apex, of small specimen; c. cuticle; jc, vessel of 



water-vascular system, X 200. 

 Fig. 11. Egg, sketched from section of young specimen, showing eggs in the 



uterus, X 37.5. 

 Fi"'. 12. 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 37.5. 

 Fig. 13. Longitudinal section through the posterior region of a small specimen ; c, 



cuticle; c>, cirrus aud cirrus-pouch; c, epidermis; rj g, marginal lobes 



of germ gland; ?«), longitudinal muscles; o o, eggs in posterior con- 



voluticms of the uterus ; sc, subcuticular libro-granular layer ; t, testes ; 



?f n, uterus ; v, seminal rece])tacle erf vagina ; rd, vas deferens ; rf/ (v/ vfj, 



marginal and jiosterior A'itelliue glands, X 300. 



Plaif, (i4. 

 Movohdlhrium f.rrehrnvs sp. nov. 



Fig. 11. Longitudinal section tlirough the posterior region of an adult specimen. X 



(iO; n, shell gland; other letters as in Fig. 13. 

 Fig. 15. Diagrammatic sketcli showing ])osition of genitalia; v, vagina; r', seminal 



rccc]»tacle; </, shell gland; other letters as in Fig. 13. 

 I'ig. !t>. Transverse section through body in region of cirrus bulb of adult, X 54; 



I, longitudinal muscles in subcutaneous fibro-granular layer; w, vessels 

 of water-vascular system; other letters as in Fig. 13. 



Fig. 17. Transverse section of body-wall in front of cirrus, X 210; /, longitudinal 



subcutaneous libers; other letters as in Fig. 13. 

 Fig. 18. From transverse section in front of germ gland, X 210; r, ciliated duct 



vagina; </, germ gland; /w, longitudinal muscles; o, egg in uterus; 



II, uterus. 



Fig. lit. Longitudinal section near ventral surface; ci, cirrus; ?•, vagina, X 300. 



