COE: NEMERTEANS OF WEST AND XOKTHWEST COASTS. 117 



situated immediately posterior to third black ring becomes deep 

 slaty blue or blackish in color. This dark shade is sharply demar- 

 cated anteriorly, fading out gradually after extending about as far as 

 the ninth ring. Markings are retained even in cedar oil and in 

 paraffin. 



Cephalic glands but little developed, appearing only as scattered 

 gland cells lying beneath and beside rhynchodaeum. Glands about 

 rhynchodaeum few ; not extending back to brain. 



Pigment of characteristic transverse and longitudinal dark 

 markings situated deep in integument, distinctly visible in prepared 

 sections. 



Proboscis small, yello\n8h or ochre in color. Proboscis sheath 

 well developed but not extending backward behind anterior third of 

 intestinal region. Cavity of proboscis sheath becomes divided in 

 exact region of the efferent nephridial ducts, forming a small 

 chamber, situated dorsally, in which retractor muscle is attached, 

 and a very much larger ventral chamber which passes backward for 

 a short distance and ends in a broad blind sac (Text-fig. 5). 

 Retractor muscle attached to the dorsal wall of dorsal chamber 

 a little distance back in intestinal region. 



Body musculature. — Inner circular layer much thickened imme- 

 diately in front of nephridial o})enings. disappearing almost entirely 

 at beginning of intestinal region. The circular muscles of proboscis 

 sheath similarly increased in strength in same region l)ut directly 

 continuous with inner circular muscles of body wall. These thick- 

 enings corres])ond in nature and position with the enormously 

 developed internal circular muscles in Carinoma and Carinomella. 



Plood system. — The i)air of rhynchocoel vessels extend fi'om 

 near the mouth back nearly half way to intestinal region, being 

 connected with lateral vessels at frequent inteiwals. Walls of 

 rhj^nchocoel vessels thickened, much convoluted, and apparently 

 glandular in nature. 



Nephridia. — Nephridial tubules limited to third quarter of eso- 

 phageal region. Each of the two main longitudinal canals large, 

 situated in parenchyma immediately above lateral vessels, swell- 

 ing out at posterior end to form a large sac which sends oft" a large 

 efferent duct to the dorso-lateral aspect of body (Text-fig. 5). 



Sense organs. — Cerebral sense organs well developed for the 

 genus, although not sharply separated from the other nervous 



