202 GRIFFIN. 



The mouth is situated between bands i and 2 and in type speci- 

 men did not pierce band 2 (difference from C. supcrbd). At inter- 

 vals much greater than between i and 2 occur bands 3, 4 and 5, 

 w^ith no intermediate annulations. Band 3 is the broadest, its 

 edges fimbriated, and interrupted between the laterals ; 4 and 5 

 are more sharply outlined, 4 continuous, 5 partially interrupted 

 at the laterals by the side organs (difference from both C. siipcrba 

 and C. anniilata, in neither of which do the side organs occur on 

 a transverse band). The broken mid-ventral line continues 

 nearly to band 5, w^here it breaks up into a row of fine dots 

 w^hich may be sometimes traced along the rest of the body. 

 From band 5 to posterior extremity of body occur broad unin- 

 terrupted annulations sometimes double, placed some distance 

 apart, with one to three finer intervening annulations, which are 

 interrupted or nearly so at the laterals. The intervals between 

 these body annulations are nearly equal. 



Variations. It .must be noted on behalf of the validity of 

 this species that the above outlined pattern is in its main features 

 remarkably constant. The variations, so far as was observed, 

 involve merely the shade of the ground color, the amount of 

 flecking, the cojnposition (/. c, whether full or broken) and ex- 

 tension of the lines. The few specimens obtained near Sitka, 

 Alaska, were darker in color, with much less flecking and 

 fimbriation of the annulations. Those taken about Puget Sound 

 showed considerable flecking on the head behind band i and 

 on dorsum, mostly near lines or bands. Moreover, in some 

 specimens the lines are more continuous, in others more or less 

 dotted or broken. 



In alcohol the worm darkens considerably, but even then the 

 main pattern can be easily made out. The side-organs then ap- 

 pear as white circular spots. 



Internal Anatomy. A cephalic gland is absent as in C. su- 

 perba. Differs from latter in general absence in region of side 

 organ of a pronounced dorsal and ventral decussation of the cir- 

 cular muscles of the body-wall. A fine raphe of connective 

 tissue is generally present in its place, which may involve a few 

 muscle-fibers. In one individual sectioned these were so abun- 



