204 Descriptions of New Species of Achatbvella. 

 32. Achatisiella pyramidalis. 



Plate VII. Fig. 32. 



T. dextvorsa, raro sinistrorsa, imperforate, pyramidal!, solidula, nitida, 

 castanea vel cinereo-fusca, basi fascia 1 albida vel luteola cincta, in anfr. 

 2 et 3 signis obliquis albidis et fuscis picta, intus aperturam eau-uleo- 

 albida ; apice subacuta ; spira regulariter conica, interdum decollate ; 

 anfr. 6^-, convexis, albo-marginatis, subtiliter transversim striatis, et sub 

 lente lineis spiralibus impressis rugosis minutissime decussatis ; ultimo 

 regulariter rotundato, yW longitudinis sequante ; plica columcllari 

 alba, valida, obliqua ; apcrtura parum obliqua, semiovali ; pcrist. intus 

 incrassato, vix reflexo ; margine columcllari dilatato, adnato vel subpa- 

 tente ; parietali nullo. 



Shell dextral, very rarely sinistral, imperforate, pyramidal, 

 rather solid, shining, chestnut or ash-brown, with a white 

 or yellowish band encircling the base, with oblique white and 

 brown markings on the second and third whorls, bluish-white 

 within the aperture; apex subacute; spire regularly conical, 

 sometimes decollated ; whorls 6£, convex, margined with white; 

 finely striated transversely, and microscopically decussated 

 with faintly impressed wrinkled spiral lines ; the last regu- 

 larly rounded, equal to , 6 /o °f the length; columellar fold well 

 developed, white, oblique ; aperture rather oblique, semioval : 

 peristome thickened within, very slightly reflected ; with colu- 

 mellar margin dilated, adnate or slightly detached ; parietal 

 margin wanting. 



Length 0.85 inch (21f mill); breadth 0.45 inch (llf mill.). 



Length of aperture 0.3S inch (9| mill.). 



Average weight 5.70 grains. 



The dimensions of a large specimen are as follows : 

 Length 0.90 inch (23 mill.) ; breadth 0.4T inch (12 mill.). 

 Length of aperture 0.40 inch. 

 "YVciirht G.00 crrains. 



