96 GENETYLLIS CITRINA. 



Norway (Canon Norman). 



Head rounded, ovate, narrower in front, with two nearly circular black eyes, often 

 with a lens-like thickening ; the size of the eyes, how T ever, differs in a series of specimens, 

 showing that too much weight need not be placed on this character. It is probably 

 connected with sexual changes. The tentacles spring from the anterior part of the 

 prostomium, and are subulate organs with finely tapered tips. The two shorter and 

 two longer tentacular cirri have also finely pointed tips. The ventral surface of the 

 prostomium is bipapillose, with a groove leading backwards to the mouth. The latter 

 has a smaller posterior lip than in Notophyllum. Occasionally white grains occur behind 

 the eyes, forming a kind of transverse bar. 



Body linear, rounded dorsally and flattened ventrally. Dorsally the segments have 

 transverse lines, while ventrally a double line of slight elevations maps out a central area 

 which is but little depressed. No specimen retained a caudal process. Of a uniform dull 

 yellowish colour, paler beneath; the dorsal cirri, especially in front, are darker, from 

 brownish pigment-grains. 



The superior division of the foot (Plate LXVIII, fig. 18 [tenth] and 19 [fiftieth]) is 

 considerably shorter than in Notophyllum, and has no prolongation upward and inward, 

 or trace of spine or bristles. It carries a somewhat reniform cirrus, which varies a little 

 in outline according to the region of the body, being almost semicircular anteriorly, with 

 the inner edges reduced, broadly reniform, but with a dorsal peak, and with projecting 

 inner lappets in the middle of the body. 



The inferior division is represented by a bluntly conical, bifid, free process bearing 

 the bristle-tuft and a yellow spine. 



The bristles (Plate LXXVII, fig. 13) have rather long translucent shafts, more slender 

 than in Notophyllum poly noides, but also with a backward curve towards the tip. The distal 

 end of the shaft is dilated and marked with fine striae obliquely directed downward and 

 backward, whilst the free edge has a series of spikes. The terminal process is of moderate 

 length, curved, and finely tapered, the edge being minutely serrated. Fine striae also run 

 obliquely downward and backward to the dorsal rib at the broader or inferior part of the 

 process. 



The inferior cirrus is obovate or oval, with a slight peak superiorly, is soldered 

 to the posterior base of the division by its inner edge, and is thus kept vertical. 



This species seems to be an inhabitant of water of some depth. No food of moment 

 seemed to be in the alimentary canal. 



Specimens from Shetland in July had many well-developed ova. 



2. Genetyllis citrina, Mcintosh. Plate LXVIII, figs. 20 and 21— feet ; Plate LXXVII, 



fig. 14 — bristle. 



Specific Characters. — Head rounded ovate, with two rather large black eyes ; tentacles 

 probably similar to those of G. Intea, but they were absent; tentacular cirri similar. 

 Body about three inches long, much tapered anteriorly. Posteriorly two short caudal cirri. 

 Dorsal surface convex, ventral depressed in centre with an elevated ridge on each side. Of 



