Gatty Marine Laboratory^ St. Andrews. 175 



Such forms a useful contrast with the hir;rf> specimen, whieii 

 seems to have successfully eluded the agencies uliicli, as a 

 rule, render examples of this size rare on our shores, though, 

 perhaps, abundant in the deeper waters. 



4. On Genctyllis citrina, a new Phyllodocid. 



This form was procured on a stone — coated with corallines, 

 a bright yellow sponge, and several ascidiaus — brought up 

 by a risherman's hook in the JMinch in 18G5. 



The head is rounded ovate, with two black eyes of con- 

 siderable size. The four tentacles had been removed, but they 

 probably resemble those of 6r. lutea. The tentacular cirri arc 

 similarly arranged, viz., two shorter anteriorly and two 

 longer posteriory. Body about 3 inches in length, much 

 tapered anteriorly. Posteriorly it terminates in two caudal 

 cirri. The dorsal surface is convi x, the ventral marked by 

 two elevated ridgets on each side of a slightly depressed central 

 area. The entire animal is of a most brilliant chrome- 

 yellow — deepest on the middle third, wiiich here and there 

 showed blackish-brown patches on the lamellje (cirri). It 

 tinged the water with a yellowish mucus, and also dyed the 

 sj)irit in which it was immersed of the same hue. 



The dorsal region of the foot has a massive, short, bluntly 

 conical process devoid of spine or bristles, and beaiing the 

 unequally cordate lamella (cirrus), which is marked by a 

 series of lines and reticulations troni a central rib. The 

 imbricate lamellae are borne more or less horizontally alono- 

 the sides of the dorsum, leaving the central region bare. 

 The semicircular gap at the base of the lamella tits the 

 rounded extremity of the division to which it is attached. 

 The short setigerous region is bifid at the tip and supported 

 by a black spine, and a group of bristles shorter than in 

 6r. lutta, the translucent shafts being slightly bent, and with 

 a dilated distal end which has a few spikes on each side. 

 The terminal process is finely tapered and shorter than in 

 G. lutea. The edge shows no distinct serrations, though the 

 adherence of particles would indicate them. Attached to the 

 ventral and posterior part of the region is an irregularly 

 renitorm ventral cirrus, vertical in position. The inferior 

 border is rounded, but the su[)eriar is truncated, with a 

 tendency to a |)oint at the upper and outer angle. The 

 cirri — both superior and interior — vary li tie ni shape 

 throughout the body. 



The stone was coated with the yellowish sponge, but its 

 connection with habits of the GenctylUn is unknown. The 



