Gatty Maine Laboratory, St. Andreios. 265 



is minute (in some^^jigtinguisliable) and closely attaclied to 

 the base of the Sq^.^ ^nd broad brancliial process, which 

 shows only a sli[,t concavity externally. In translucent 

 preparations this amellar branchia shows a crenate mem- 

 branous border ay lai-o-e central trunks. The setigerous lobe 

 IS prominent ancjf^ side view forms a projecting lamella both 

 above and belo^ the spine. No fillet occurs at the base of 

 the barred brinies. The bristles are of moderate length, 

 with a curve bckward. Both the barred and the elongated 

 Kinds are some,{,{^t slender, the former being marked by clo^e 

 transverse bai and tapering to a fine point (PI. VIII. iig. 4) ; 

 the latter alsc^igi^jgi- and tapering to a delicate tip, the blade 

 with distinc serrations (rows of spikes) on the expai\ded 

 region abov the shaft (PI. VIII. figs. 5 & 6), the tip appa- 

 rently smoOj_ '\^\\q, serrations, however, are easily removed. 



I he inieor division stands widely apart, without a lamella 

 or occasioijlj oidy a trace. It has a blunt point and extends 

 further oi\ya,-(l than the dorsal. The s|)inigerous lobe is 

 flattened ,j(] conical, with the sjjine at the aj)ex. The fillet 

 at the ba^ of the barred bristles sends a process superiorly. 

 ihe ini<iQj. cirrus is of moderate size and conical in shape. 



1 oste,Qi-iy the dorsal and ventral lobes of the feet b3Com3 

 prolong(^l and acute. A trace of the dorsal lamella is still 

 visible 'j^^iie branchia, however, has shrunk to a minute 

 proces}je,^eath the small cirrus. The inferior division has 

 ^PP^ched considerably nearer the upper and extends as a 

 lo'ig.ointed lobe half its length beyond the upper, and the 

 ventj cirrus is carried outward nearly in a vertical line with 

 t''6 ranchia. 



^le feet and bristles were studded with numerous examples 

 of .1 whitish clavate ecto-parasite like Loxosoma, which, 

 ''Oever, had a series of spine-like processes, either lateral or 

 tcninal. - ^ 



Nephthys lawreticii, sp. n. 



Dredged on Bradelle Bank, Gulf of St. Lawrence, Canada, 

 873 ; at Stat. A 1, 1872 ; and off Port Hood, 1873. 



The head is somewhat longer than broad, though inextru- 

 ■on of the proboscis it becomes shield-shaped. A short and 

 )mewhat flattened conical tentacle comes from each angle of 

 le rather narrow and straight anterior margin. The second 

 r ventral tentacles, which are separated from the first by a 

 hort interval, are similar in shape but scarcely so large, 

 Cwo slight elevations occur on each side of the median line 

 losteriorly. In the ordinary position of the proboscis within 

 he body the ventral cirrus of the first foot shows a somewhat 

 ori 



