A. E. Verrill — Marine Planarians of JVew England. 517 



Figure 6. — Trigonoportis folium Y., p. 487. Dorsal view of a living specimen; x 5. 



Sta. 134, off Cape Ann, Mass., in 26 fath., July 23, 1878. Color yellowish brown 



with the gastric region and margins pale ; ganglions and nerves pink. 

 Figure 7. — Leptoplana variabilis (Girard). No. 20, p. 480. Dorsal view, from life; 

 x5. Sta. 156, off Gloucester, Mass., 42 fath., Aug. 15, 1878. Color yellowish 



brown with pale margins and central stripe. The clusters of cerebral ocelli are 



too long and too divergent. 

 Figure 8. — Bdelloura candicki Girard, p. 499. Dorsal view of a living specimen 



slightly compressed between glasses, and seen by transmitted light; x 3. 

 Figure 9. — Fovia affinis (CErs.) Stimp. (var. grisea V.), p. 504. Dorsal view of a living 



specimen; x 6. Fig. 9a, the same specimen strongly contracted while living; 

 X 6. Fig. 9&, the same ; dark-brown variety. Ventral view of a living specimen, 



seen by transmitted light; x 3. Gloucester, Mass., on eel-grass (Zostera), 1878. 



Figure 10. — Procerodes ulvce (CErs.) Stimp., p. 506. Dorsal view of a living specimen; 



X 8. Casco Bay, at low-water mark, 1873. The ocelli are not shown, owing to 



the dark shading. 

 Figure 11. — Polychoerus caudafus Mark, p. 511. Dorsal view of a living specimen; 



X 20. Noank, Conn., July 30, 1874. The caudal cirri should have been left 



without color. 

 Figure lira. — The same. Another individual seen as a transparent object, slightly 



compressed between glasses. Wood's Holl, Mass., 1881. The bilobed body, 



covering the region of the spermatheca, was probably an egg-capsule (or two of 



them) in process of formation (see p. 514). 



Figures 3 and 11 were drawn by J. H. Blake; 4, 6, 7, 8, dh by the author; the 

 rest by J. H. Emerton. 



Plate xlii. 



Figure 1. — Eustylochus ellipticus (Girard) V., p. 466. Dorsal view of a living speci- 

 men ; X 6. New Haven Harbor, Oct., 1892. 



Figure la. — The same specimen. Ventral view; x6; h, one of the tentacles; c, 

 brain; /, pharynx; m, mouth; d, vas deferens; r, seminal vesicle; ^j, penis; p', 

 penis-bulb and granular gland; S. male orifice ; 2, female orifice ; .s, sperma- 

 theca ; s', duct of the same; v, vagina; m, large oviduct or uterine sac; z, orifice 

 of the median nephridial tube (z'). 



Figure \h. — The same. Male genital organs of a young mounted specimen; much 

 enlarged; d. d, vasa deferentia; r, seminal vesicle; p, penis; j/, penis-bulb and 

 granular gland. New Haven Harbor, Oct., 1892. 



Figure 2. — Stylochus zebra V., p. 403. Ventral view of a living specimen ; x4; /, 

 pharynx ; m, mouth ; d, vas deferens ; $ , male orifice ; $ , female orifice ; w, 

 shell-glands. Off New Haven. 



Figure 2a. — The same. Dorsal view of the head and anterior portion of another 

 specimen from the same locality, from life ; x 4. 



Figure 3. — Planocera nebulosa Girard, p. 473. Genital organs of a young specimen ; 

 much enlarged. New Haven Harbor, Oct., 1892. d, vas deferens; r, seminal 

 vesicle ; r', its duct ; p, penis and penis-sheath ; p', penis-bulb and granular 

 gland ; $ , male orifice ; 2 , female orifice ; v, vagina ; s, spermatheca. 



Figure 4. — Triyonoporiis dendriticus V., p. 491. Ventral view of a specimen mounted 

 in balsam; x 6. Station 317, off Cape Cod, 1879. 



