A. E. VerHll — Marine Planarians of N^etn Migland. 510 



Figure '6h. — The same specimen. Ocelli and brain ; x 25 ; c. brain ; e, cerebral ocelli ; 



e', dorsal ocelli. 

 Figure 4. — Lejjtoplana ellipsoides Girard, p. 483. Ocelli ; x 25 ; e, cerebral, and e . 



dorsal clusters. Eastport, Me., 1872. 

 Figure 4a. — The same. Dorsal view of the genital organs; xl5. The lettering is 



the same as that of 3a. Figure 4&. — The same parts; ventral view^. 

 Figures. — Trigonoporus dendriticus Y ., \>. 491. Type-specimen. Sta. 317. Ventral 



view of the genital organs ; x 25 ; S , male orifice ; 'p, penis ; p', penis-bulb ; 7, 



penis-sheath ; k, granular gland ; ? , anterior female orifice ; 2 ', posterior 



female orifice ; w, shell-glands. 

 Figure 6. — Polychcerus caudatus Mark, p. 512. Ventral view of a mounted specimen; 

 X 15. Wood's Holl, Mass., 1881. This specimen is noteworthy fcr having five 



caudal cirri. The digestive cavity contains numerous small crustaceans. 

 Figure 7. — The same. Ventral view of a mounted specimen having three caudal 



cirri; x 15 ; $, female orifice; s, spermatheca; 0, one of the ovaries; t, sper- 



marian folicles or testes; p, retracted penis and male orifice. 

 Figures. — The same. Ventral view of the genital organs of a mature specimen; 

 X 30 ; d, d, vasa deferentia ; r, seminal vesicle ; ])• penis exserled ; ? , female 



orifice ; s, spermatheca or bursa seminalis ; 0, cluster of mature eggs. 

 Figure 9. — The same. Male genital organs of another specimen with the penis (p) 



fully exserted ; r, seminal vesicle ; x 30. 

 Figure 10. — The same, another specimen. A partially profile view of the genital 



organs; x30; $, female orifice; u, vagina; 2h penis partly protruded; d, d, 



vasa deferentia ; r, seminal vesicle. 

 Figure II. — Bdelloura Candida Girard, p. 499. Ventral view of a specimen containing 



a nearly mature egg-capsule; x6; c, brain and ocelli; /t, longitudinal muscles 



of the sucker; n, one of the longitudinal nerve-trunks; «', frontal nerves; ;/, 



anterior division of the stomach ; j\ pharynx ; 0, o, ovaries ; ca, egg-capsules ; 



M, uterine sac or accessory gland. 



The large chitinous egg-capsule occupies the entire thickness of the body, no organs 

 appearing over its central part, on either side, except the thin, stretched integument ; 

 its front edge lies above the end of the pharynx, and the vasa deferentia run above 

 its lateral borders. How it is expelled is not known. 



Figures 1, la, 2, 3, 3a, and 11 were drawn from nature by A. H. Verrill; the rest 

 by the author. 



Plate xliv. 

 Figure 1. — Stylochus frontalis V., p. 4G5. Ocelli and tentacles of the type-specimen, 



mounted in balsam; x30; h, b, tentacles retracted; e, e, cerebral clusters; e', e', 



dorsal clusters at base of tentacles ; e", e", scattered frontal ocelli. 

 Figure 2. — Leptoi^lana angusta V., p. 485. Ventral view of one of the type-specimens, 



mounted in balsam; xl2; r, brain ; /J pharynx ; »i, mouth; f, f, sperniarian 



folicles ; d, vas deferens ; p, penis and penis-sheath ; v, vagina and sh^ll-glands ; 



s. spermatheca ; $ , female orifice ; u, uterine sac filled with mature ova. 

 Figure 2a. — The same. Brain and ocelli ; x 30 ; c, brain ; e, cerebral, and, e' dorsal 



clusters. 

 Figure 3. — Tlie same. Reproductive organs of another mounted specimen; x 20 ; p, 



penis ; q, penis-bulb and sheath ; v, female orifice and ventral portion of vagina ; 



v', dorsal portion of vagina ; u, u, large oviducts or uterine sacs filled with 



mature ova. 



