90 Cincinnati Society of JSTatural Ilistori/. 



stance composing the segments, quite thick, so as in some instances to 

 resist compression ; extremities terminating rather abruptly. 



Segments smooth, verj^ narrow, of equal width on all parts of the 

 bod}^ strongly convex, and from twelve to fourteen in the space of one 

 line. 



. Length of body A'ariable according to age, and in a specimen having 

 a diameter of one third of a line, the length is one and one eighth 

 inches. The usual width, however, is a little more than one half of a 

 line. 



This is a neat species, and several fine specimens have been obtained 

 of it, south of Covington, at an elevation of about 100 feet above low 

 water mark. 



Protoscolex ornatum, n. sp. (Plate IV., fig. 1.) 



Bod}' long, slender, of uniform width, with the two extremities 

 obtusel}' pointed or rounded. 



Segments having a width equaling one eighth that of the body in the 

 compressed condition, about nine occupying the space of one line; the 

 entire body is ornamented with from one to two rows of small papilla? 

 on each segment, arranged respectively in either one row running across 

 the body in the median line of a segment, or one row near each edge of 

 the segments. 



The entire length of the species is doubtful, no specimen having been 

 found that is positively known to be complete. The largest specimen 

 examined is 2^^ inches in length, and it is possible that this was the 

 entire length, since one extremity shows the original termination very 

 well, while the other extremity, which appears to be somewhat con- 

 tracted, but it is too much contorted for satisfactory determination, 

 would seem to be the other termination. 



The wider and papillated segments in these species will amply serve 

 to distinguish it from the P. covinfffonensis. 



Locality and Position. — Same as the last. 



Protoscolex tennis, n. sp. (Plate IV., fig. 3.) 



Body very long and exceedingh^ slender, of uniform width. Ex- 

 tremities tapering gradually and pointed. Annulations obscure' 

 smooth, somewhat convex, with about four in the space of one line. 



This species reaches a length of six inches, with a breadth of one 

 half a line. The smallest complete specimen seen is a little more than 

 two inches in length, and has a width of about one fourth of a line. 



This form is easily distinguished from any of the preceding, by its 

 proportionally greater length and wider segments. The latter are 

 usually very obscure, which is not so in the others. 



Locality and Position. — Same as the last. 



