94 HELEN L. M. PIXELL ON 



It will be noticed that this specimen is smaller than those described before : it 

 agrees more nearly with SCHMARDA'S specimens in having only twenty branchuL-. Each 

 of these has seven pairs of well-formed dorsal appendices, with rudiments of others towards 

 the tips. The specimen was by no means fully developed, nor was it sexually mature. 



No trace of colour remains, except on the gills and the pigment spots already alluded 

 to. The tube is also missing. 



Genus Eurato Saint- Joseph, 1894 (16, p. 249). 



Generic characteristics : 



1. Thoracic and abdominal tori with a single row of avicular crotchets. 



2. Branchiae without dorsal appendices and arranged in a single series. 



3. Thoracic setae all simple blades. 



Eurato melanostigma (Schmarda). 

 Sabella melanostigma Schmarda, 1861 (17, p. 36), from Jamaica. 



1. Branchiae about half the length of the body, few in number, with short pinnae 



and an interbranchial membrane. 



2. A pigment spot on each side of every segment, between the fascicles of setae 



and the tori. 



3. Thorax of five setigerous segments (? always). 



Several specimens from Station 24, Porte Grande, St Vincent, Cape Verde Islands. 



These specimens seem to be immature, and are much smaller than SCHMARDA'S ; but 

 from the latter's brief description they would seem to be the same species. 



They are 5 mm. or less in length, the branchiae when intact making up nearly 2 mm. 

 of this ; the greatest width is about 1 mm., and the largest number of abdominal seg- 

 ments counted was thirty-five. 



The collar has two pointed ventral lobes, but is otherwise not very high, and stops 

 short some distance from the mid-dorsal line. 



The collar-setae have long narrow blades (fig. 6, a) ; there are only four other setiger- 

 ous thoracic segments, and these have slightly wider blades in addition to the long 

 narrow ones (fig. 6, b). The abdominal segments have the wider blades only. The 

 thoracic tori have about twelve avicular crotchets (fig. 6, c) ; the abdominal only seven. 



The anal segment is asetigerous and very distinctly bi-lobed. 



There are only seven or eight pairs of gills. 



In no specimen were gonads apparent ; this immature state may account for the 

 small number of branchiae and thoracic segments. 



One very young specimen was 2 mm. long and I mm. wide, only very slightly 

 tapered at each end, and containing eighteen setigerous segments ; all of these seemed 

 to have the setae ventral to the tori, i.e. to be abdominal segments, except one or two 



(HOY. SOC. EDIN. TRANS., VOL. XLIX., 354.) 



