140 COE 



to whom I am indebted for specimens 01 this and other species of 

 California nemerteans, states in his notes that " in some specimens 

 the alternate white rings extend only to the lateral white longitudinal 

 lines, and do not go entirely around the body." 



After preservation in formalin, the region between the second and 

 third white rings is much darker in color, as commonly occurs in the 

 genus. As usual the contrast in color is very marked anteriorly, but 

 shades off gradually beyond the third white ring. 



A rather conspicuous rounded pit, of much paler color, situated 

 exactly on the lateral margin of the body just dorsal to the longitudinal 

 white band, and on the anterior border of the third white ring, marks 

 the position of the lateral sense organ on each side. 



The worms are prone to break up when captured, the fragmentation 

 taking place at the white rings, where the body often shows con- 

 strictions. 



Proboscis. Proboscis sheath extends only a comparatively short 

 distance into intestinal region, but is well developed throughout the 

 esophageal region. Just in the vicinity of the nephridiopores the rhyn- 

 chocoel becomes sharply divided into a smaller posterior cavity and an 

 enlarged anterior chamber. The anterior chamber continues ventrally 

 for a few sections as a blind sack beneath the smaller dorsal cavity 

 into which the posterior end of the proboscis continues. These fea- 

 tures are similar to those described for C.frenata (p. 133), but are less 

 pronounced. Proboscis becomes separated from its sheath in the region 

 of the mouth, and therefore some little distance behind the brain. 

 It is provided with two large nerves which arise from the ventral 

 ganglia at points of origin of the unusually large ventral commissure. 

 The nerves pass dorsally and immediately enter the proboscis sheath, 

 in the tissues of which they extend posteriorly fora few sections, when 

 they enter the proboscis at its attachment to the sheath. The arrange- 

 ment of the epithelial and muscular layers is as in related species. 



Musculature and integument present no marked peculiarities. 

 The basement layer beneath the integument is unusually well devel- 

 oped. Dorsal crossing of fibers between the internal and external 

 muscular layers is much better developed than in any of the other 

 known species from the Pacific coast. 



Cephalic Glands. In addition to the highly developed, deep- 

 staining masses of glands in the integument of the head, a thick layer 

 of similar glands is found around the rhynchodseum. These extend 

 backward nearly to the brain, and are very conspicuous from their 

 secretions, which stain deep purple in haematoxylin. The condition 



