GASTROPODA. '.'.'. i 



l.lucplr* ubrncT ] 



BUBCONCAVA, W. .*/>. (UlHch.) 



PLATE i.xix. nog. 



iff<> di.itn<<t<T about tD mm., but varying In thirteen specimens between the extremes of 15 and 

 25 nun. Th- hi^ht. which Is about equally divided between the spire and bane, compares with the greatest 

 width atxmt as six to eleven, i in i i,.- upper side of the shell the surface of the whorls Is concave, but this 

 concavity Is produced chit-fly by the elevation of the two edges, the peripheral one being thick and the 

 Mitural one thin and sharp. The umbilicus Is tilled, the surface of the filling but slightly concave and Its 

 outT margin, which Includes a space with a diameter equalling somewhat leas than a third of the greatest 

 wi.lth of tht- (hell, more or leas sharply defined. The anterior outline of the lower lip bows rather strongly 

 forward in th.- ..ut.-r two-thirds, and always more so than It does In L. pertimilit. If we add to this that 

 the iniiMllcal cavity Is much less depressed, and Its tilling not nearly so extensive as In that species, we 

 have at least three good characters by which ordinarily good specimens of the two specie* may be 

 distinguished. 



Compared with other species we find that both L. helena and L. euyenia of Billings are closely 



related. In the first the bight is relatively greater, the inner lip higher and more nearly vertical and the 



umbilical depression narrower, more abrupt, and much deeper. In the second the outer part of the basal 



half of the shell is more nearly vertical, the form of the aperture more nearly quadrate, and the whorls 



-x above near the suture." 



Formation and locality. Lowest division of the Stones River group, near Murfreesboro, Tennessee. 

 CbUsetfen.-E. O. Ulrlch. 



LIOSPIRA BCOATA, n. sp. (Ulrich.) 



PLATE LJCIX. FI08. B-M. 



* 



In ten representative specimens the width varies from 14 to 20 mm. The hlght equals about 

 two-thirls of the width. Volutions four or five, with a thick ridge above along the suture, deeply concave 

 between this and the elevated band which is set obliquely upon the upper angle of the periphery. The 

 latter is vertical, rather wide and unusually well defined below where It passes Into the moderately convex 

 base. Lower and outer portions of perlstome bowed strongly forward, and prominent at the obscure angle 

 of the periphery, above which the outline curves strongly backward toward the band. Inner Up thick, 

 turned outward, excavated in front, reflected and completely covering the umbilicus. Mouth rounded- 

 pentagonal; shell rather thick. The surface markings are not well preserved. As far as known they 

 consist of strong, almost wrinkle-like, lines of growth. As this is an unusual feature among species of 

 this genus, we have chosen a specific name that will call attention to It. 



Of previously described species, only L. tugtnia Billings, need be compared. That species agrees 

 closely In most respects, but evidently has finer surface markings, while It differs decldely In the more 

 uniform convexity of the under side of the whorls. L. kelena Billings Is farther removed. Two other 

 Canadian species, L. numeria Billings sp., and HtlioAoma lanata Salter, resemble our species, yet may be 

 distinguished at once by the umbilicus which Is open In them and closed in L. ruqaUi. The next species, 

 iunJu/o, is as closely related as any. 



fo\ m*Ho* mud locality. Richmond group, Lincoln county, Kentucky. 



CHMbn.-B.amiM 



LlOSIMKA I '| M1MH I.A. H. Sp. (Ulfifh. 

 PLATE LXIX. FI08. 17 41 



The average width of this shell, according to twenty *r> - about 12 mm., th>- liik-ht about 7 



mm. The largest seen has a width of ; mm. The species Is closely related to L. nujata but does not 

 atuin the site of that shell, has finer lines of growth, a more uniformly rounded base, and relatively 



