56 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



rounded light spots may be found on the dorsal surface of the body in light- 

 colored individuals, usually associated with certain papillae. 



There is a certain correlation in the development of light spots in different 

 parts of the body ; an animal which has a well-developed median vitta will 

 also have conspicuous marginal and intermediate light spots and vice versa. 



The ventral side of the body is much lighter in color, marked only by a 

 few longitudinal bands of dull brown or greenish brown. The number of these 

 bands is either eleven or twelve according as there is present, in addition to 

 five pairs of bands laterally placed, a single broad median band or a pair of 

 narrow paramedian bands separated by an irregular median clear band. 



From the under side of the body one can often see in living animals the green 

 pigmented crop diverticula showing through the semi-transparent body. 



XXfl. 



XXIII 



Figure C. — G. parasitica, var. rugosa. Dorsal view of posterior part of body, 

 showing position and approximate relative size of papillae. From a Cam- 

 bridge, Mass., individual. 



(2) Var. rugosa, var. nov. 



The dorsal surface of the body is much rougher in this variety, the papillce 

 being larger, more numerous, and structurally more complex. Instead of being 

 simple, low, and dome-shaped, the more conspicuous papillae are extended dis- 

 tally in several divergent whitish points, giving the body a decidedly rough, 

 harsh feeling to the touch in the case of hardened specimens. The larger 

 papilla; are likewise rendered more conspicuous by the fact that they are 

 commonly unpigmented, though placed in a generally dark background. 



The arrangement of the principal rows of papillae on the dorsal surface is 

 similar to that in GT. plana, but with the following easily determined and con- 

 stant difference. In somites xxiii. and xxiv. (Figure C), the median row of 

 pajjilla; becomes inconspicuous or disappears altogether, and a large papilla 

 appears on either side of the median line, on the sensory ring of each somite. 

 The ventral surface is free from papilla) as in plana. 



