STROPODA 



frnkforlMta.l 



>Vrm/i'.. it-.i, nnm|,, [V K:iU> '-..unly, and 



,*WU.-Pr,,f .1 M Saffur.l: K. O. flru-li. 



I'.i.-ANIA HRANKKOKTKNS1-. //. >/'. (I'lrirll.) 

 I l.\ . I K1OB. 



Tliis species is related to both />'. //</../. i// ami />'. n<is/uilli'nnis,b\it is distinguished 

 from loth liy it- Miiitriannnlar aperture. thicker inner lip and coarser surface 

 -riilpture. The volutions are also narrower and the hight of the shell, as compared 

 to the width, relatively greater. While it is scarcely possible that any one will 

 ronfiiund it with the tirst name. I. -.m-h an occurence is not improbable with the 

 secoixl. since in both the dorsum i- <>l>tusely angular. Still, where good ventral 

 - ran l>e compared (see plate LXVI, figs. 32 and 37), showing their different 

 im nit h- aii.l the more rapid lateral expansion of the outer volution of II. naxIn-HUnsis, 

 a glance -liould suffice to separate them. 



Formation and locality. Near Uip of Trenton k'r'.np. Frankfort, Kentucky. 

 CbUtrftoit.-K. O. Ulrlch. 



KM \M\ 8UBANOULATA, W. /). (Ulrich.) 

 PLATE LXVI. rioa. -. 



In this well marked species the dorsum is obtusely angular, the slope of the 



-in fare from the slit-band to the edge of the umbilicus somewhat flattened, and the 



-harply rounded or subangular, these features imparting a widely triangular, 



perhap- it would be better to say rhomboidal, section to the volutions, which of 



itself i> Mittirient to distinguish the species from the associated H. rugatina. Con- 



tinuing our conipanxm- with that species, we find that the surface markings, 



though similar in pattern and strength, are not so regular, and the umbilicus is a little 



r aii'l better defined, while the slit-band forms the flat summit of a low keel 



fl i>f a smooth groove. Both n.frnnkfortensis and K. nashvillensis are probably 



-ly related, though readily distin^ni-hed by their greater size, relatively smaller 



umbilicus, and more rapidly enlarging volutions. At maturity, however, the 



ventro-lateral angles are more abruptly expanded in 11. subangulata, giving the 



aperture a more broadly triangular form than i- the case in either of the larger 



species. It is to be borne in mind, further, that these large shells require no more 



turns to attain their full growth than do specimens of the present species less than 



half their size. 



In the largest of eight specimens the hight is about 23 ram., the width of the 

 aperture about 25 mm., the hight of same (in a side view) 17 mm. In a Miiall 

 specimen the same measurements resulted respectively in '. mm., '.) mm., an. I ". mm., 



