718 KEPOET OF COMMISSIONEE OF FISH AND FISHERIES. [20] 



This species we found, both abundant and large, between tides, ' 

 ranging nearly to the top of high water. 



At Provincetown it was the only shore Nereis, the JV. limhata, so 

 common every where south of the Cape,notbeingfouud at Provincetown 

 at all, though found at Wellfleet. 



Nereis limbata Elders. 



Ehlers. Die Borsteuwiimier, p. 567. 1868. 



Verrill. Invert. Animals of Vineyard Sound, etc., pp. 318, 590, pi. xi, fig. 51. 1874. 

 Webster. Annel. Chaet. of the Virginian Coast, p. 235, pi. vi, figs. 70, 75. 1879. 

 Annel. Chaet. of New Jersey, p. Ill, pi. iii, figs. 21, 22. 1880. 



We found a number of specimens of this species at Wellfleet in sand 

 and mud. All small. Not found at Provincetown at all, though care- 

 fully looked for. At Wellfleet, on some oysters lately brought from 

 Chesapeake Bay, we found a living specimen of N. limbata. 



Nereis pelagica Linn. 



This widely distributed species was common at all depths below fif- 

 teen fathoms. For synonomy up to 1868, see Ehler's Borstenwiirmer, 

 p. 511. 



Nereis pelagica Linn. Syst. Nat., ed. x, p. 654 ; ed. xii, p. 1086. 



Verrill. Invert. Animals of Vineyard Sound, etc., p. 591, pi. xi, 



figs. 52-55. 1874. 

 Marentzeller. Siidjapanische Auneliden, part i, p. 14. 1879. 



Nereis tenuis n. sp. 



(Pl. Ill, IV, Figs. 37-43.) 



The width of the head (fig. 37), in its widest part, nearly equal to 

 the length; posterior two-thirds convex, with convex sides; anterior 

 third much narrowed and flattened, and with a median depression run- 

 ning back to the convex part of the head. 



Eyes lateral, not quite so regular in outline as shown in the figure j 

 posterior pair a trifle larger than the anterior. 



Palpi long, and with long terminal articles, the basal part being a 

 little longer than the head. 



Antennai conical, delicate, close to each other at base, half as long as 

 the head. 



The proboscis (fig. 38) has the basal and maxillary rings of about the 

 same length. Paragnathi small, conical, black, arranged as follows: 

 I, wanting; II, single curved series; III, a transverse series, near the 

 posterior margin of the ring; lY, curved line; V, three at the angles 

 of a triangle; VI, wanting; VII and VIII, merged, forming a series, in 

 part single, in part double. 



The jaws were not completely exposed; on the part seen there were 

 five stout, rectangular teeth. 



