34 Mr. P. H. Gosse on neiv or little -known Marine Animals. 



inward at the tips ; their colour is a clear green. Segments four- 

 teen, all but the last two furnished on each side with a pencil of 

 stiff long bristles, few, converging to their tips, deeply seated, 

 nearly straight, but curved forward at the points, simple ; wholly 

 retractile. Last segment round, with a pair of well-defined eye- 

 like spots. 



Length ygth of an inch. 



This little species is common at Weymouth, coming out of 

 tufts of Rhytiphlcea pinastroides when these are kept in glass 

 vases. The little Annelid crawls up the side of the glass, often 

 going tail-foremost; a curious fact, when considered in con- 

 nexion with the eye-like spots on the last segment, which cannot 

 be distinguished from the true eyes of the anterior extremity. 



It is possible that this may be the immature condition of one 

 of the succeeding species. The ring of uncinate cilia suggests 

 youth. 



Sp. 2. O. Bairdii (mihi). Plate IV. figs. 23, 24. 



Segments above thirty, without eye-spots at either extremity ; 

 gills each composed of five or six stems^ set with a double row 

 of short pinnse : bristles with an oval expansion at their base. 



Description. — Gill-fans two, ample, each consisting of five (or 

 six) stems divided almost to the base, each set with a double row 

 of short ciliated pinnse, not graduated, curling inwards in a 

 plumose manner. Segments (in the specimen described) thirty- 

 four, all but the last two with pencils of bristles ; three in each 

 pencil (fig. 24) very short, finely-pointed, with an oval blade-like 

 dilatation at the base of each. The segments diminish quickly 

 but gradually to the last, which forms a blunt point, and is un- 

 spotted. No eyes are visible on the head, nor any ring of cilia. 



Length ^th of an inch ; colour whitish- green, opaque ; gill-fans 

 hyaline. 



A single specimen was found with the preceding, at Wey- 

 mouth, in April. I have dedicated the species to my esteemed 

 friend. Dr. William Baird of the British Museum. 



Sp. 3. 0. Johnstoni (mihi). Plate IV. figs. 25-28. 



Segments above thirty, without eye-spots ; gills each of about 

 sixteen stems, some of which are simple, others set with gra- 

 duated pinnse : bristles with an expansion near the tip. 



Description. — The gill-fans are composed of many (about 

 sixteen) stems, some of which are quite simple, others set with 

 numerous long, but graduated pinnse in two rows, and others in 

 an intermediate condition, the pinnse being rudimentary or 

 short (fig. 26). The stems (fig. 28) are hollow, with close-set 

 transverse lines {septa ?) ; and the pinnse are covered with small 



