A. E. Verrill — Marine Netnerteans of Nev^ England. 453 



Plate XXXIV. 



Figure 1. — AmpM'por us frontalis, sp. no v. Dorsal view ; x 2; la, the same speci- 

 men, ventral view of the head. (No. 10) Eastport, Me., 86 fath., 1870; 1&, the 

 same, dorsal view of the head of another specimen. This was pale salmon with 

 pale purplish spots on the sides due to the ovaries ; proboscis-sheath greenish, 

 (No. 86) Eastport, Me., low-water. 



Figure 2. — AmphiiMrus ccbcus, sp. nov. Dorsal view ; x 5 ; 2a, 2b, dorsal and ven- 

 tral views of the head of another specimen (No. 721); 2c, extruded proboscis of 

 the same specimen, enlarged. 



Figure 3. — Amph/porusbioculatus. Dorsal view; x 5. Off Fisher's I., Conn., July 22, 

 187'!:. The ocelli are too much obscured by the color in printing. 



Figure 4. — The same. Dorsal view of a younger specimen of the light colored 

 variety, compressed under the microscope ; x 10. Newport, R. I. 



Figures. — Amjjhijwrus roseus. Dorsal view; x 2; 5«, the same, head and anterior 

 portion of body, dorsal view; x 4 ; 5&, the same, side view; x 4. 



Figure 6. — AynpMporus tetrasorus, sp. nov. Dorsal view ; x 3. Massachusetts Bay, 

 1878. 



Figure 7. — Ampjliiporus heterosorus, sp. nov. Head and anterior portion of body, dor- 

 sal view; X 1-J-. Massachusetts Bay, 1878. 



Figure 8. — Amphiporus frontalis, sp. nov. Dorsal view of a small specimen partly 

 contracted; x 3. Off Witch Rock, Massachusetts Bay, September, 1877. 



Figure 9. — Amphiporus mesosorus, sp. nov. Head and anterior portion of body, dorsal 

 view; x 3. Massachiisetts Bay, off Salem, August 13, 1877. 



Figure 10. — letrastemma elegans Y . Type specimen from life. Dorsal view; x 6. 



Figure 11. — Tetrastemma vermiculus. Young, dorsal view; x 12. 



Figure 12. — Tetrastemma vermiculus, vav. catenula. Dorsal view ; x 8. Noauk, Conn. 



Figure 13. — Tetrastemma dorsale. Dorsal view of head and anterior portion of body 

 with protruded proboscis ; x 8. Casco Bay, 1873. 



Figure 14. — Tetrastemma dorsale, y&v. marmoratum. Dorsal view; x 3. The lighter 

 and darker mottlings are not sufficiently distinct. Casco Bay. 



Figure 15. — Amphiporus bioculatus (?). "Very young, dorsal view ; x 1 2 ; compressed 

 imder the microscope, while alive. Newport, R. I., September 1, 1880, station 

 851, \2^ fath. Color translucent white ; eyes black. 



Figure 16. — Ainphiporus {Nareda) superba. Copy of the original tigure. 



Figure 17. — Amphiporus heterosorus, sp. nov. Head and anterior part of body, dorsal 

 view ; x 2. 



Figures 2, 3, 10, 11 are by J. li. Blake; figures 4, 8, 13, 15 are by J. H. Emerton ; 

 the rest, except 16, are by the author. All are from living specimens. 



Pl.\te XXXV. 



Figure 1. — Oerebratulus lacteus. Young, natural size; la, the same, ventral view of 

 head and extruded proboscis, natural size. New Haven, Conn. 



Figure 2. — Emplectonema giganteum V. Dorsal view of a specimen not full grown ; 

 i natural size. 



Figure 3. — Amphiporus cruentoMis Y . Dorsal view; x 4. 



Figure 4. — Amphiporus agilis V. Dorsal view ; x 4. 



Figure 5. — Amphiporus glutinosus Y. Dorsal view ; x 2. 



Figure 6. — Tetrastemma vittatuvi V. Dorsal view; x 8; compressed under the 

 microscope, while living. 



