Gatly Marine Laboratory ^ St. Andrews. 259 



is generally paj)ilIose, witli dist:il rows (twenty-two in number) 

 of slender elongated papilhu, of wliiclieaeli row has from 5-7. 

 A median cirrus in front of the rows in the mid-dorsal line. 

 The body has from 90-132 segments or more. Foot with 

 the dorsal lamella rounded, its greatest vertical diameter being 

 median and its axis directed upwards. At the outer edge of 

 the foot is a smaller rounded lamella. Dorsal cirrus slender 

 and long. Branchial process of moderate length. Inferior 

 lobe sinuous below the small terminal lamella, with a small 

 papilla at the inner border of the latter superiorly. Ventral 

 cirrus large and conical. Bristles brownish, comparatively 

 short, the serrated forms having a distinct curvature of the 

 dilated region beyond the shaft and a serrated edge. The 

 barred forms are tinely tapered. 



The fourth species, NepJuhys hystricis', sp. n., comes 

 from Berehaven (Royal Irish Academy's Expedition), from 

 various stations in the Mediterranean during the ' Porcupine ' 

 Expedition of 1870, and a closely allied, if not identical, form 

 was obtained by Canon Norman otf Bergen. The head is 

 elongated from before backward, with rather pointed subulate 

 tentacles anteriorly, the broader second pair following afcer an 

 interval. Peristomial segment ventrally with two broad flaps 

 and a symmetrical series of furrows. Body resembling that 

 of N. ciliata. Proboscis comparatively short, with slender 

 papilla? in twenty-two rows. The mid-dorsal pair converge 

 on the long tentacle immediately in front, and the rows on 

 each side of the mid-ventral line converge in a more marked 

 manner; but there is no median filament. As a rule four 

 papillaj occur in each row, but in some there are traces of a 

 tif th, and in the ventral pair (on each side of the median line) 

 six short papilla?. Foot with a long, little elevated, dorsal 

 lamella, which does not extend so far outward or droop at the 

 tip as in N. scolopendroides. It approaches in form the foot 

 of N. ciliata, but diifers in the shape of the dorsal lamella and 

 in the fact that in front of the capillary bristles the spinigerous 

 region forms a low cone with the spine at the apex, the barred 

 bristles arising in the fissure between it and a large flap or 

 lamella formed by the tillet guarding the bristles, whereas in 

 N. ciliata the spinigerous region itself forms the free flap. 

 The dorsal cirrus is somewhat thick, separated OJily by a 

 shallow notch from tlie branchia, which is of moderate size, 

 has a papilla at its outer base, and is curved outward. Bristles 

 similar to those of iV. scolvpendroides, but thinner. Inferior 

 division of the foot with a small lamella posteriorly, another 

 nearly as ])rominent formed by the tillet for the barred bristles, 



17* 



