520 A. K Verrill — Marine Planarians of N'eio England. 



Figures 4, 4a. — Trigonojjorus folium V., p. 487. Original type-specimeu monuted in 

 balsam. 4, ventral view of the genital organs, x 15 ; <J , male orifice; j;, penis; 

 A:, penis-bulb and granular gland ; 2 , anterior female orifice in a cup-like depres- 

 sion ; V, vagina mutilated ; t«, iv, shell-glands. 4a. dorsal view of the same parts, 

 with the same lettering, and ^j', penis-sheath ; v', dorsal portion of vagina ; s ', 

 posterior female orifice. 



Figure 46. — The same specimen ; (•, cerebral ocelli; e', dorsal ocelli; x 30. 



Figure 4c. — The same specimen. Part of front margin and marginal ocelli; x 30. 



Figure 4cZ. — The same specimen. Mouth and retracted pharynx, ventral view ; x 10. 



Figure 56. — The same. Brain and ocelli of a specimen from sta. 134, 1878. Ventral 

 view; x50; f, c, cerebral ganglions; e, cerebral ocelli; e' dorsal ocelli; n. n, 

 large frontal nerves ; g, median anterior gastric branch. 



Figure 6. — The same. Genital organs of a specimen from sta. 301. Ventral view; 

 X 30 ; 3, male orifice; p, penis; j/, interior of penis-bulb; q, i enis-sheath ; k. 

 granular gland ; $ , anterior female orifice ; ? ', posterior female orifice ; v, ven- 

 tral part of vagina; ■;;', dorsal part of vagina; tv, shell-glands; u, supposed ori- 

 fice of nephridial duct. 



Figure 7. — The same. Genital organs of a sijecimeu from sta. 182, 1878 Ventral 

 view ; x 30. Lettering is the same as in fig. 6. 



Figure 8. — Bdelloura Candida Girard, p. 499. A specimen stained with borax-carmine 

 and picric acid and mounted in balsam. New Haven. Oct., 1892. A'entral view; 

 xlO; A, posterior sucker; c, c, two cerebral ganglions of the brain, and the 

 ocelli ; c', main frontal nerves (five pairs are shown, by stippled lines, with a few 

 of their branches); n, one of the great longitudinal nerve-trunks; «', posterior 

 commissure uniting the nerve-trunks, from this part large numbers of branches 

 diverge to the borders of the posterior sucker; im, one of the several serial 

 transverse commissures uniting the nerve-trunks ; %", marginal nerve and exterior 

 branchlets ; /, pharynx, retracted; /', its open end; g, anterior median division 

 of the stomach ; </', one of the two main posterior divisions of the stomach ; 

 g", one of the transverse lateral gastric branches. (The stomach and its branches 

 are left unshaded for greater clearness ; they are usually more deeply colored 

 than the other organs); o, left ovary; o', its duct : y, vitellaria or yolk-glands; 

 X, left accessory female gland or "uterine sac" and its convoluted duct, going 

 to the female genital organs; ^), penis and penis-sheath ; $ ,J , common genital 

 orifice ; t, t, testes or spermarian folicles. 



Figure 8a. — The same. Ventral view of the posterior part of a living specimen com- 

 pressed between glasses; x 20. The gastric branches are distended by the pres- 

 sure and the nervous system is omitted. The lettering is the same as in fig. 8, 

 with the following additions; d, vas deferens of the right side; r, seminal vesi- 

 cle; V, vagina. 



Figure 86. — The same. Side and profile views of an egg-capsule that was attached 

 by both ends; x 8. 



Figures 2, 3, 4, 4a, 8, 8a, 86 were drawn from nature by A. H. Verrill; the rest by 

 the author. 



