Mr. P. H. Gosse on new or little-known Marine Animals. 33 



Segments about thirty-eight, nearly alike in size, but those of 

 the middle parts more separable ; diminishing abruptly at the 

 tail. 



Feet slightly developed for the first five or six segments ; 

 thence thick, with a semi-oval lobe projecting from the upper 

 portion (PI. IV. figs. 17 & 20), from which protrudes a fan-like 

 pencil of bristles, which are short (about as long as the foot), 

 slightly curved, consisting of a slender shaft with a terminal 

 notched knob, bearing a short curved blade set in the notch; 

 this blade is longer in the upper bristles (fig. 18) of the pencil 

 than in the lower ones (fig. 19). The lower pencil (figs. 17 & 

 21) consists of very long, simple, finely-pointed bristles (about 

 twice as long as the breadth of the body), which project laterally 

 or posteriorly, and are not retractile ; these long bristles do nut 

 appear till the 10th segment, and disa])pear at the 32nd. 



The tail consists of two fusiform appendages, much resembling 

 the antenrise, about half as long as the greatest width of the 

 body. 



Colour hyaline, slightly tinged with yellow. Total length 

 l^th of an inch. 



Pound at Weymouth on the side of a glass in which I had 

 placed a tuft of Rhijtipldcea. It makes a gelatinous tube attached 

 to the glass (fig. 14), in which it moves freely backwards and 

 forwards by means of its long setae. 



Order Ch-sitopoda. Fam. Sabellad^e. 



Genus Othonia (Johnston). 



Gill-fans two, composed of several soft, thick, curled-inward, 

 pectinated^ ciliated stems set like a star around the mouth : body 

 composed of twelve to thirty-five segments, all furnished with 

 lateral pencils of bristles, but without hooks. Animal inhabits 

 a membranous tube, open at both ends, which it often forsakes. 



The discovery of two other species of this genus renders ne- 

 cessary a revision of the generic characters ; as some of those 

 enumerated by Dr. Johnston (Loudon's Mag. N. H. viii. 183) 

 are merely those of the single species then known, O. Fabricii. 



Sp. 1. O. Fabricii (Johnst.). Plate IV. fig. 22. 



Segments fourteen ; first and last with a pair of eye-like spots : 

 pinnse of gills graduated in length ; bristles simple. 



Description. — Head with two well-defined eyes, and a ring of 

 vibratile uncinate cilia. Gill-fans wrinkled; pinnated; the pinnse 

 long, and so graduated that the tips are level ; they often curl 



Ann. 6f Mac/. N. Hist. Ser. 2. Vol. xvi. 3 



