A typical segment of the body consists of a convex dorsal and 

 a flattened ventral arch. The former is bare in the middle line^ 

 but has laterally a superior division carrying a dense series of 

 bristles and a posterior row of branchiae — with a cirrus at the 

 dorsal margin and another midway between the bristles and the 

 branchiae. The latter is the longer and has a slight median 

 constriction. Neither tapers much. The inferior division has 

 a tuft of bristles, andinferiorly and posteriorly a cirrus, which is 

 generally more slender distally than either of the foregoing. 

 All are shorter and thicker than in the British EnpJirosyne foliosa. 

 The dorsal row of bristles is comparatively short in contrast 

 with the northern E. borealis, and are even less boldly marked 

 than in Euplnosync foliosa. The curve of the tip of the bristle 

 is less pronounced than in the latter, and the disproportion 

 between the processes more distinct. The notches on the limbs 

 of the fork are due to transverse grooves. At the dorsal edge 

 as well as in the centre of the row are many bristles with a 

 smooth fork, the longer process being much attenuated — so that 

 they project beyond the serrated kind. The ventral bristles are 

 considerably larger than the dorsal, and are terminated by a 

 slightly curved blunt tip, with a rounded spike at the base. 

 The central canals from the processes coalesce after a short 

 course downward, and a slight dilatation occurs opposite the 

 enlargement at the upper end of the shaft. 



In Enphrosyne and Cliloeia the bristles are characterised by 

 their extreme brittleness, their tubular condition, calcareous 

 nature and the entrance of air into the interior. 



The branchiae, which are eleven in number in the typical 

 segments, form a densely ramose series on the dorsal region of 

 the segment. Each is dichotomously branched, and the tips 

 end in elliptical or sub-oval bodies resembling those of EupJiro- 

 sviic foliosa. So far as observed the branchiae are devoid of a 

 cavity, and the blood-vessels can be traced from the body-cavity 

 up to, but not into, the tips of the organs. A complex series of 

 muscular fibres appear at the base, and the cuticle and hypo- 

 derm are dense, except distally — where the former becomes very 

 thm. 



In the structure of the body-wall the species offers no 

 peculiarities. The nerve-cords superiorly have a firm invest- 

 ment which is continuous from side to side. In the hollow 

 between them superiorly is a fascicle of muscular fibres and 

 below them is a central granular structure. Moreover, the cords 

 are united by a striated isthmus inferiorly. 



The anterior part of the buccal apparatus or proboscis is 

 cylindrical, ensheathed in cuticle, and protrusible. The centre 

 is occupied by a large muscular and vascular, but chiefly 

 glandular mass, the inner lining of which is thrown into bold 



