1897.] KEW YORK ACADEMY OF SCIENCES. 219 



longitudinal bands, but each anterior somite, especially the first, 

 bears a reddish, single, transverse stripe, over the yellow back- 

 ground. (3) The enlarged first somite forms a very prominent 

 collar. (4) No black spots occur regularly on parapodia. 



These difl^erences are such as to exclude N. cyclurus from the 

 description of Nereis fucata Sav, The affinity of the two, on 

 the other hand, is undoubted and, without entering upon the in- 

 teresting problem of the widely separated distribution of these 

 allied species, I oflTer the following detailed descriptions of the 

 Pacific and the Scandinavian forms as the evidence for my con- 

 clusions. 



V. Description of Nereis cyclurus, n. sp. 



Head, when fully visible, longer than broad. Tentacles from 

 three-quarters to nearly the length of head, separated at base 

 and divergent. Palpi large, closely appressed to tentacles, latter 

 reaching about to the tips of the bosses. 



Paragnathi. (1) Maxillary median — generall}^ three or four 

 separated equidistant and median points, — (sometimes small 

 groups 7wt arranged in median single line). (2) Lateral dorsal 

 maxillary on each side of former — about 18 to 20 points in well 

 defined prominent groups. (3) Median ventral maxillary — 

 patches of small points — scattered. (4) Lateral adjoining last, 

 large well defined group of prominent teeth (15-20). (5) 

 Median dorsal proximal teeth = two points prominent in an 

 ill-defined ring on proximal basal somite which is slightly strong- 

 est at ventral side. PI. XYL, fig. 3. 



Maxillffi brown, with a longitudinal crescentic ridge on ventral 

 side, 10 teeth on each maxilla. 



First somite — forming a col hir characteristic of species — twice 

 as broad as succeeding somite, smooth above, longitudinal 

 wrinkles below and laterally. Lateral flaps extending forward 

 to cover proximal ring of proboscis when latter is extended. 

 Collar bearing dull reddish pigment, except for a white trans- 

 verse strip along dorsal anterior border. Flaring flaps of collar 

 laterally and ventral not bearing dull rod pigment. Dorsal sur- 

 face head between eyes bearing band of pigment which reaches 

 forward in two small streaks and is continued on to the lateral 

 sides of palpi. PI. XVI., fig. 3. 



Outer parts tentacles, and basal joints tentacular cirri, pig- 

 mented. 



Eyes large, converging, far apart transversely; those on each 

 side, near together antero-posteriorly. PI. XVI., fig. 3. 



1st parapod. Alike in types a, b, c. Prominent dorsal cir- 

 rus twice as long as parapod. Upper part of superior lobe oval 



