^22 Remarks on Certain Species 



carina in a measure obsolete behind tbe aperture, but modi- 

 fjing its form. 



Tiie var, found fossil at Jackson, Miss., is well marked, being 

 ribbed above, the ribs passing over the periphery, with, at the 

 base, an additional less prominent rib between each. I have 

 living examples of the same form from Tennessee, Arkansas, 

 and Louisiana. 



Helix inordax SBitittleworth. 



This M\as described by Shuttleworth in the following terms : 

 {Bern. Mitth., 1852, Diag. n. Moll., No. 2.) 



T, late et perspective umbilicata, depressa, subknticiilaris, carinata, 

 tenuis, luteo-cornea, strigis riifis interniptis fasciatim ornata, costis vali- 

 dis flexuosis reniotis iitrinque eximie asperata ; anfr. 5^, plarii ; apertura 

 perobliqua angulatim lunari-ovalis ; perist. simplex, aciitum. 



Diam. niaj. 18, min. 16, Alt. 6 mill. 



Hah. — In mont. Carolina^ sept, specimina ultra 12 legit Rugel. 



Obs. — H. alternatai valde affinis, sed costis validioribus, ad 1 mill, inter 

 se remotis, distincta. II. Cumberlandiana Lea (forsan mere forma mon- 

 struosa), qiiacum carina congrnit, differt (ex icone) testa tantum tenuiter 

 striata nee costata. 



Shuttleworth observes that II. inordax being costate is dis- 

 tinct from II. alternata.^ and also from H. Cuiiiberlandiana., 

 described by Lea as tenuiter striata y the fact is, that both his 

 own and Lea's species are costate, although the costae in the 

 latter are not so sharp and regular, indeed on the last whorl 

 near the aperture are partially obsolete. Shuttleworth states 

 that his shell agrees, as regards the carina, with II. Cumher- 

 landiana. I have not seen an autlientic specimen of II. mor- 

 dax, but looking at the description consider that it bears the 

 same relation to II. Cuoiiberlandtana, as H. CaroUnensis to H. 

 ohstricta, and although with costse like the southern forms of 

 S. alternata already noticed, being carinated to the extent 

 described, it is a variety of II. Cumherlandiana. 



