394 A. E. ^^errill — Marine N^emerteans of Kew England, etc. 



Length, in extension, 30'"'" to 50'""^ ; diameter 3""" to 5'""' ; length 

 of proboscis, in extension, 25""" ; diameter i-o"^"^ (Xo. 5). 



The specimens described above, from life, were taken off Cape 

 Ann, Stat. 136 (U. S. F. C), in 26 fath., sand, 1878. Eastport, 

 Me. ; Bay of Fundy ; Gulf of Maine ; Casco Bay ; Massachusetts 

 Bay ; off Cape Cod ; common in 10 to 200 fathoms, on muddy and 

 sandy bottoms. 



Amphiporus tetrasorus Ven-iii, sp. nov. 



Plate xxxiv, figure 6. 



Body very changeable, in extension roundish, I'ather thick, taper- 

 ing but little, obtuse at both ends. Head as wide as body, usually 

 obtuse or subtruncated in front, separated from the body by conspicu- 

 ous transverse fossae which curve upward and forward on each side; 

 on the under side of the head these fossfe run forward, on each side, 

 to the mouth. Ocelli nvimerous, forming two oblique, oblong, nearly 

 parallel clusters on each side, the posterior ones just in front of, and 

 parallel with, the transverse fossae. 



Color of body, above, chocolate-brown, darker medially ; head, in 

 front of eyes, white ; body, beneath, whitish. 



Length, 26 to 30""" ; diameter, 2"^"". The specimen described 

 above, from life, was dredged at Station 132 (U. S. Fish Com.), off 

 Cape Ann, Mass., in 45 fathoms, mud, July, 187^8. 



Amphiporus lactifloreuS (Johnston) Mcintosh. 



Plavaria Inctiflorea Johnston, Zool. Journal, vol. iii, p. 489, 1828. 



Nemertes lacUfiorea Johnston, Mag. Zool. and Bot., vol. i, p. 5.35, pi. xvii, f. 2 and ?,, 



1837. 

 Borlasia alba W. Thompson, Ann. Nat. Hist., vol. xv, p. 320 (with woodcut), 18-45. 

 Polm mandilla Quati;efages, Ann. des sc. nat , 3""' ser., Zool , torn, vi, p. 203, tab. 8, 



figs. 1 and la, and tab. 9, fig. 2, 1846. 

 Nemertes mandilla Diesing, Syst. Helm., vol. i, p. 274, 1850. 

 Omafoplea mutabilis Diesing, op. cit., p. 262, 1850. 

 Omatoplea rosea Johnston, Catalogue P>rit. Mus., p. 23, plate na, f. 2, 2*, 2**, 3, 



and 3* 18G5. 

 Omatoplea alba .Johnston, op. cit., p. 23, 1865. 

 Amj)hiporus laclifloreus Mcintosh, British Annelids, Part I, Nemerteans, p. 156, 



plate 1, figs. 1 and 2, 1873; Jensen. Turbellaria ad Lit. Norvegije, p. 80, 1878. 

 Amvhiporus laclifloreus Verrill, Notice of Recent Addit. to Mar. Invert., Part 1, in 



Proc. National Mus., ii. p. 184. 1879. 



Plate xxxix, figures 7, 7a. 



Body rather elongated, roundish above and on the margins, flat- 

 tened l)eneath, of nearly uniform breadth fi'om the head to near 



