GASTROPODA. 1079 



rt ntut 1 



AN.;! -TA, n. sp., and var. SUBPLANA, n. var. 

 1 1. rios. 



peclM is rvpro;u>nte<l In the oollectloni before us by fourteen or more casts of th Interior, 

 i are sh-mlrr, with an apical angle of 18 to 30, and consist of four or Ove volutions, the perfect shell 

 probably having had several more at the apex. The whorls are unusually high, very slightly convex 

 alnuwl flat and separated by very oblique, deep and open sutures. Indicating a rather thick shell. The 

 aiTiuri- 1 narrow, somewhat lenticular In iitlln<>, and almut three times as long as wide. The largest 

 specimens Indicate a total bight of about 100 mm. 



Figure 32 represent* one of two specimens that may be distinguished at least as a good variety, for 

 which we propose the name raAptano. It differs from the typical form of the species In having an apical 

 f 25, Instead of 20 or less, and lets distinct sutures, Indicating a thinner shell. 



Formation and ioeaitty. Fragments of this species are not uncommon In the Clltambonitea bed of 

 the Trenton group, at various localities In Ooodhue county, and more rarely In the lower part of the 

 plra bed near Cannon Falls and Fountain, Minnesota. It occurs also In the lower half of the name 

 group of rocks near Burgln, Kentucky. 



CWJwtioiu. Geological and Natural History Survey of Minnesota; E. O. Ulrlcb; W. H. Scofleld. 

 JfaMm Reyitter, Not. 218, 7378, 7423, 8394. 



Family LOXONEMATIDJC. 

 Genus MEEKOSPIRA, n. gen. (Ulrich.) 



Shell elongate conical or somewhat fusiform, consisting of smooth, nearly 

 flat or more distinctly convex, and but slightly overlapping, whorls; aperture subovate, 

 occasionally somewhat effuse below; inner lip slightly reflected, simple, without 

 folds winding about the columella so as to pass out of sight opposite the middle of 

 the aperture, lines of growth nearly or quite straight and vertical. Type, Eulima ? 

 (later Polyphemopsis) ptracuta Meek and Worthen, Coal Measures, Illinois. Probably 

 congeneric species have been referred to Melanin, Knlimn, Polyphemopsis, Macrochilina 

 and Sultulitts. 



We regard this genus as occupying an intermediate position between Loxonemn, 

 Phillips, and SoUniscus, Meek and Worthen (Macrochilus Phillips), two genera which 

 in some of their extreme forms border closely upon the ground of the proposed 

 genus. In another direction Meekotpira approaches Bulimorpha, Whitfield, while 

 the new genus on the whole reminds one considerably of the Eulimidtr of which 

 some of its species may be the ancestors. 



Meekospira will probably include beside the type species also Polyphemopsis 

 nUitlnln and P. inornnf ..f M>ek and Worthen, of the Coal Measures, P. louisvilla- 

 Hall and Whitfield, and Mflfini untiqua Goldfuss, Devonian, Macroclnlinn fnilinm. 

 M. cancellata and M. fenestrata of Lindstrftrn and Subulitet (Polyphemopsis) planilntcni/is 

 Foerste, Upper Silurian, and the Lower Silurian species about to be described, 

 If. tubconicn. 



