1901.] NATURAL SCIENCES OF PHILADELPHIA. 291 



considerable distances apart. Such processes are found in most 

 species of the genus. 



0. Papilloe, each of which bears a thick, more or less curved, 

 conical spine, refractive and homogeneous in appearance (Plate 

 XI, figs. 2, 4, 11 J. These are the least numerous. I did not find 

 them in the specimens from Lake Erie, but they are present in the 

 types and co-types of morgaiii and puerilis (I had overlooked 

 them at the time of my former description). The size and form 

 of the spines is variable. 



Surface views of the cuticle w'cre given in my preceding paper. 

 In the males the large papillie (the third kind) always appear 

 darker and larger than the other papillae ; they may be arranged 

 close together or, when less numerous, show the tendency to form 

 large, irregular groups. In the largest females the cuticle on 

 surface view is like thaf of the males, except that the third kind 

 of papillae are less numerous; in females which lack the third kind 

 of papilla?, the darker disks on the surface of the cuticle represent 

 patches of papillae of the second kind. 



Diagnostic Characters. — The sculpturation of the cuticle is so 

 variable that it is difficult to give a sharp diagnosis. But the 

 regular occurrence of papilke (the second kind) of more or less 

 conical form, each bearing a short delicate spine; the quite gen- 

 eral occurrence of higher papillae (the third kind), each generally 

 with a circlet of a few similar spines, and the occasional occurrence 

 of papilke bearing each a thick conical spine, seem to distinguish 

 C. morgani from any hithero described species of the genus. But 

 the degree of variation in this form, individual and sexual, shows 

 how necessary it is to examine large series of individuals in 

 separating the species of the Gordiacea ; an individual variation 

 about as great is found in C. occidentalis Montg. , as has been 

 shown by me in a preceding paper. ^ 



All the specimens seen by me of Chordodes morgani were from 

 the United States of America, from the following localities: Lake 

 Erie, Maryland, Iowa and Pennsylvania; thus it would seem to be 

 a species of the eastern portion of North America. 



^ Proc. California Acad. Sciences, Third Series, Vol. I, No. 9, 1898. 



