COE: NEMEETEANS OF WEST AND NORTHWEST COASTS. 123 



on body in the middle portion of esophageal region. This is 

 sharply demarcated anteriorly, but fades out gradually posteriorly 

 as in other s])ecies of genus. It is usually twice as wide as the 

 diameter of the body, and towards its posterior portion shows a 

 clear, oval area on each lateral margin. These oval areas represent 

 the lateral sense organs. 



Size. — A minute species, commonly 10 to 25 mm. in length when 

 sexually mature, and from less than 0.5 to 1 mm. in diameter. 



Color. — Pure white and translucent in head and esophageal 

 regions, changing to opaque white or cream color at beginning of 

 intestinal region. Median dorsal and ventral bands of very pale 

 yellow or slightly orange color sometimes appear in intestinal region 

 of mature females filled with cream colored eggs. 



Proboscis and proboscis sheath as in related species ; not extend- 

 ing into posterior half of body. 



Musculature. — Muscular crosses between the two circular muscu- 

 lar layers very little dveloped, except for a limited distance on dorsal 

 side of body in nephridial region. Internal circular muscles very 

 little developed, but become thicker in posterior nephridial region 

 than elsewhere, and practically disapjjear immediately posterior to 

 efferent nephridial ducts, as in G. linearis and certain other related 

 species. The band of longitudinal muscles so massively developed in 

 C. linearis and in Cakinomella (p. 136) between proboscis sheath 

 and alimentary canal in posterior nephridial region is practically 

 wanting in the present species. 



Cephalic glands. — Integument of head very much thickened and 

 provided with an abundance of deeply staining glands which appar- 

 ently take the place of speciaUzed cephalic glands, for these latter 

 are entirely wanting, except for a thick layer of deeply staining 

 glands closely bordering the rhynchodaeum. 



Alimentary canal. — Mouth situated immediately behind slightly 

 constricted posterior portion of head. Esophageal cavity divided into 

 two distinct regions lined with specialized ej)ithelium, as in Carino- 

 MELLA. Anterior esophageal cavity extends to about the anterior 

 end of nephridial region or to anterior end of brown band seen on 

 surface of body after preservation. From this point back to the 

 posterior end of nephridial region extends the posterior esophageal 

 cavity, or stomach. The histological peculiarities of these two por- 

 tions of the alimentary canal are similar to those described for Car- 

 INOMELLA (p. 137). 



