206 Descriptions of New Species of Achat hiella. 



plumbea, coloribus nigris, fuscis et albidis strigatS. et undulate ; apice 

 snbacuta, albido et castaneo tessellata ; spira conica ; anfr. 6-J, superne 

 tumidiusculis, submarginatis, ultimo 7W longitudinis requante ; columella 

 alba, modice plicate ; apertura parum obliqua, sinuato-ovali ; perist. intus 

 incrassato, antice subreflcxo ; margine columellari dilatato, patente ; 

 parictali nullo. 



Shell dextral, deeply, narrowly umbilicate or perforate, acu- 

 minately ovate-conic, solid, shining, finely striated and micro- 

 scopically very faintly decussated, lead grey, streaked and 

 waved with black, brown, and white ; apex subacute, tessellated 

 with white and chestnut ; spire conic ; whorls 6-5-, somewhat 

 swollen above, slightly margined ; the last equal to yW of the 

 length ; columella white, moderately plicate ; aperture some- 

 what oblique, sinuously oval ; peristome thickened within, 

 slightly reflected anteriorly ; with columellar margin dilated, 

 unattached ; parietal margin wanting. 



Length 0.90 inch (23 mill.) ; breadth 47 inch (12 mill.). 

 Length of aperture 0.42 inch (10 jj mill.). 

 Average weight 5.50 grains. 



The dimensions of a large specimen are as follows : 



Length 1.00 inch (25| mill.) ; breadth 0.50 inch (12| mill.). 



Weight 8.00 grains. 



Var. b. — Much smaller. 



Length 0.74 inch (10 mill.); breadth 0.42 inch (10§ mill.). 

 Length of aperture 0.33 inch (S| mill.). 

 Weight 4.00 grains. 



Yar. c. — With interrupted dingy white band encircling the 

 base : quite rare. 



Va/r. d. — Ventricosely ovate ; spire short ; whorls G, swollen, 

 the last flattened in the middle : rare. 



One specimen is of the following dimensions : 



Length 0.S5 inch (21| mill.); breadth 0.52 inch (13| mill.). 



Length of aperture 0.43 inch (11 mill.). 



Weight 7.00 grains. 



