454 A. K Verrill — 3farine Nemertecma of New England. 



Figure 7. — The same. Dorsal view of the variety with a single pale dorsal stripe ; x 3. 

 Figure 8. — Tetrastemma vermicubis. Dorsal view: x 8. Wood's Holl, Mass., low-water. 

 Figure "d. — Tetrastemma candidum (?). Dorsal view of a very young specimen, much 



enlarged; compressed under the microscope, while living. Newport, R. I., sta. 



851, 12i fath., September 1,. 1880. 

 Figure 10. — The same. Dorsal view of a somewhat older specimen. Savin Rock, 



Conn., October 18, 1887. 

 Figure 11. — Tetrastemma vermiculus, waw catenida : x 2. 

 Figures 1, 6, 8 are by J. H. Emerton; figures 3, 11, are by J. H. Blake; the rest are 



by the author. All are from living specimens. 



Plate XXXVI. 

 Figure 1. — Micrura afflnis. Dorsal view; x 4. Off Martha's Vineyard, 1887. 

 Figure 2. — Cerebratulus lacteus. General view of a living specimen of the pinkish 



variety, natural size. Wood's Holl, July 17, 1875. 

 Figures. — Cerebratidus luridus Y . Natural size. Noank, Conn., Aug. 8, 1874. 

 Figure 4. — Cephalotlirix linearis. General view; x 8. 

 Figure 5.— The same. Dorsal view of the head and anterior portion of the body of a 



young specimen, much enlarged. Wood's Holl, Mass., August 19, 1881. 

 Figure 6. — Dinophilus simplex, sp. nov. Dorsal view, much enlarged; 6a, the same, 



ventral view of head and mouth, much enlarged. Newport, R. I. 

 Figures 1, 2, 3 are by J. H. Blake; 4, 5, 6 are by J. H, Emerton. All are from living 



specimens. 



Plate XXXVII. 

 Figure 1. — Cerebratidus lacteus. Pale variety, ^ natural size; la, the same, side view 



of head, in extension; 16, the same, ventral view of head, in partial contraction. 

 Figure 2. — Cerebratulus fusciis. Dorsal view of head and anterior part of body in 



moderate extension ; 2a, the same specimen in a state of contraction ; 2b, 2c, ven- 

 tral views of the same specimen in different degrees of extension. All natural 



size. 

 Figure 3. — Cerebratulus luridus. Natural size, but considerably contracted in length. 

 Figure 4. — Lineus duhius. Ventral view; x 2; 4a, dorsal view of the head, more 



enlarged. August 18, 1878. 

 Figure 5. — Linens viridis. Green variety, natural size ; 5a, the same, side view of 



head, natural size ; 56, the same, ventral view of head, more enlarged. East- 

 port, Me., low- water. 

 Figure 6. — Micrura affinis. Enlarged 11; f rom Eastport. Me. ; 6a, the same, posterior 



end of another specimen. 

 Figure 7. — Micrura inornataV. Dorsal view; x 2. Massachusetts Bay, sta. 135, 



25 fath., 1878. 

 Figure 8. — Lineus socialis. General view of the light green variety ; x 2 ; 8a, the 



same, side view of head and anterior part of body, more enlarged. 

 Figure 9. — Lineus pallidus. Dorsal view; x 2; 9a, the same, side view of head; 



more enlarged. Massachusetts Bay. 

 Figures 3, 5, 6, 9 are by J. H. Emerton ; 1 and 8 by A. H. Verrill ; the rest are by 



the author. All are from living specimens. 



Plate XXXVIII. 

 Figure 1. — Nectonemertes mirabilis, sp. nov. Dorsal view with proboscis partially 

 extended; x 2. Atlantic Ocean, sta. 2036, 1883. 



