16 [115] 



Var. MINOR. — Long. 15 mill, ad " Red River of the North," legit R. Kennicott. 



Shell elongate-oval, thin; shining, amber-colored ; spire short, acute; whorls 

 three, convex, the last marked with the wrinkles of growth, and irregular, 

 heavy, spiral furrows ; suture moderate ; columella covered lightly with callus ; 

 and allowing all the interior whorls to be seen from below to the apex ; aper- 

 ture oblique, oval, 5-7ths the length of the shell, the lower portion of its mar- 

 gin considerably expanded. 



Mr. Say describes S. ovalis as showing the interior apex from the base of the 

 shell ; in other respects his description does not apply to this shell. Its aper- 

 ture is nearer that of S. ovalis, Gould non Say, but the peristome is much more 

 tiexuose, and the upper third of the shell becomes gradually attenuated, so as 

 to give a sharp pointed appearance, though the spire itself is short. The re- 

 volving lines are sometimes continuous over the whole body whorl, but gene- 

 rally interrupted, or confined to the interstices of the incremental strise or 

 wrinkles. It shares this peculiarity with S. concordialis, Gould, and /S. lineata, 

 nob. 



Named in honor of Dr. F. V. Hayden. 



Helix cooperi. — Testa umbilicata ; elevato-globosa : solida ; striis obliquis 

 incrementi et lineis spiralibus leviter intercidentibus notata ,• alba, ad periphe- 

 riam fascia unica, angusta, rufa, cincta, aut fasciis et lineis rufis, volventibus, 

 varie dispostis, ornata ; sutura impressa ; spira elevata ; anfr. 5 convexi, ultimus 

 rotundatus, ad aperturam valde descendens; umbilicus mediocris, pervius, 

 1-5 diam. maj. testae aequans ; apertura perobliqua, circularis ; perist. sim- 

 plex, incrassatum, ad umbilicum reflexiusculum, marginibus valde approximatis, 

 callo albo, crasso, conjunctis. Diam. maj. 15 ; min. 13 ; alt. 9 mill. 



Habitat, Black Hills, provincia Nebraska, frequens. Dr. F. V. Hayden ! (Yel- 

 lowstone R. Ex. Ex., Lieut. Warren.) 



Shell umbilicated ; elevated, globose ; solid, with oblique incremental striae 

 intersected with delicate spiral lines ; color white, variously marked with a 

 single narrow band, or broader longitudinal and spiral patches of reddish- 

 brown ; suture impressed ; spire elevated ; whorls five, convex, the last rounded, 

 very decidedly deflected at the aperture: umbilicus moderate, pervious, l-5th 

 the greater diameter of the shell ; aperture very oblique, circular ; perist. simple, 

 thickened, reflected at the umbilicus, with its extremities very nearly approach- 

 ed, and joined by a heavy white callus. 



Resembles nearly no described American species. Has an elevated spire like 

 H. pennsylvaniea, Green, and somewhat approaches H. solitaria, Say, It is, 

 however, very much smaller, has rougher striae and revolving lines ; the umbili- 

 cus is different, as is also the circular aperture, with nearly approaching ends 

 like H. viitata, Mull., of Ceylon. There is a curious variety of JI. solitaria, Say, 

 found by Lieut. Bryan at Bridger's Pass, which may be compared with this in 

 size, but the only specimen I have examined has no revolving lines, and wants 

 the characteristic aperture. Some specimens of this species have a more 

 flattened spire. 



Named in honor of Dr. J. G. Cooper, of P. R. R. Survey. 



Helix newberryana. Testa late umbilicata ; orbiculato-depressa ; solida ; 

 striis tenuibus incrementi et lineis subtilissimis, spiralibus, leviter granulato- 

 decussata ; nigra, aut rufo-brunnea, sub epiderme alba ; sutura valde impressa ; 

 spira depressa ; anfr. 6, regulariter accrescentes, superi plani, ultimus convexus, 

 subtus rotundatus, ad aperturam descendens ; umbilicus latus, perspectivus, 

 anfr. omnes ad apicem mostrans ; apertura obliqua, transverso-lunaris ; in ex- 

 emplis junioribus, paries aperturalis, sculptura anfr. praecedentis, callo levi 

 obliteratfl, eleganter notata est lineis elevatis, numerosis, confertis, spiralibus ; 

 in exemplis maturis, haec sculptura occulta est callo incrassato, sed intus in anfr. 

 omnibus remanet ; perist. simplex, acutum, intus callosum, marginibus sub- 

 convergentibus, callo albo conjunctis. Diam. maj. 37 ; min. 20 : alt. 13 mill. 



Habitat in California. Specimina plurima coUegit Dr. J. S. Newberry, 

 (Colorado Ex. Ex. Lieut. Ives.) 



[May, 



