594 REPOET OF COMMISSIONER OF FISH AND FISHERIES. 



Nematonereis, species undetermined, (p. 508.) 



A species, apparently belonging to this genus, was dredged in 29 

 fathoms, east of Block Island. The specimens have been lost or mis- 

 laid. In life the head was small, rounded, with one median dorsal 

 antenna, about as long as the diameter of the head. Eyes two, small 

 but conspicuous, dark brown. Dorsal cirri slender. 



Ltjmbriconereis fracilis CErsted. (p. 507.) 



Conspec. Ann. Dan., p. 15, figs. 1, 2, 1843 (t. Malrogren). Lumbricus fragilis 

 Miiller, Prod. Zool. Dan., p. 216; Zool. Dan., vol. i, p. 22, PI. 22, figs. 1-3, 1788, 

 (t. Malmgren). Luvibrinereis fragilis Malmgren, Annulata polychajta, p. 63, 

 PI. 14, figs. 83-83, D. 



Mouth of Vineyard Sound and deeper waters outside ; northward to 

 Nova Scotia and Gulf of Saint Lawrence. Northern 'coasts of Europe. 

 From low-water mark, in the Bay of Fundy, to 430 fathoms, off Saint 

 George's Bank. 



Ltjmbriconereis opalina Yerrill, sp. nov. Plate XIII, figs. 69, 70. (p. 



342.) 



Lwiibriconereis splendida Leidy., op. cit., p. 15 (non Blainville). 



Body cylindrical, much elongated, largest in the middle, tapering 

 gradually toward the head, which is comparatively small ; segments 

 well marked. . Head conoidal, obtuse, changing much in form during 

 life; in extension considerably longer than broad, and more acute than 

 in the figure. Eyes four, in a transverse row, the two middle ones 

 larger and a little in advance of the others. The lateral appendages, or 

 "feet," consist of a short, obtusely-rounded basal papilla, which bears 

 the setae ; from the posterior and ventral end of this a prominent elon- 

 gated lobe arises, which is somewhot curved and obtuse. These appen- 

 dages are longer in the middle of the body than anteriorly. Setse five to 

 nine in each fascicle, and of several forms ; one or two in each fa'scicle 

 usually have a long, slender, flexible capillary point. Color reddish or 

 brownish, with brilliant iridescence. 



Length up to 400 mm ; diameter in middle, 3 mm . 



New Haven to Yineyard Sound ; low- water mark to 14 fathoms. 



Ltjmbriconereis tenuis Yerrill, sp. nov. (p. 342.) 



Body very long, slender, filiform, of nearly uniform diameter through- 

 out, capable of great extension ; segments very numerous, well marked. 

 Head a little narrower than buccal segment, depressed, obtusely pointed 

 or rounded in front, without eyes. In the first to ninth pairs the late- 

 ral appendages have about six slender lanceolate setse; those of the ninth 

 pair have two slender spatulate setse, with about six or seven lanceolate 

 ones ; at the sixteenth pair they begin to have recurved spatulate setse, 

 with two or three hook-like denticles at the end, while two or three 

 lanceolate ones remain; posterior to the twenty-third or twenty-fourth 

 pair only one of the long, slender, acute setse remains, accompanied by 



