SAGDA. 63 



aaa. Basal lamina one whorl long or more. 



b. Lamina peripheral in position, lamellifera. 



bb. Lamina basal in position. 



c. Much depressed-trochoida}, solid, somewhat 

 translucent, smooth ; base but little excav- 

 ated; columellar fold small or obsolete; 

 basal lamina more than a whorl long; 

 whorls 7-1-9 ; alt. 16, diam. 23-25 mill. 



connectens. 



cc. Trochoidal, solid, strong, costulate-siriate 

 above the periphery ; no columellar fold; 

 basal lamina a full whorl long; whorls 7; 

 alt. 17, diam. 20 mill.; alt. 13, diam. 16 

 mill. epistylioides. 



ccc. Globose-trochoidal, solid, strong ; base some- 

 what excavated ; columellar fold strong and 

 lamellar within ; basal lamina strong, about 

 one whorl long; whorls 8; alt. 18, diam. 

 19 mill. Smaller and paler than jay ana, 

 with less excavated base, but probably a 

 variety ofjayana. alveare. 



cccc. Elevated trochoidal, solid, strong and 

 opaque; base deeply excavated ; columellar 

 fold and basal lamina strong within, but 

 often not visible from the aperture ; whorls 

 9 ; alt. 25, diam. 27-28 mill. ; alt. 18, diam. 

 24 mill. jayana. 



ccccc. Globose-trochoidal, solid but thin, covered 

 with a yellow cuticle bearing minute spicules 

 or pitted; base depressed, excavated; col- 

 umella with a strong lamellar fold ; basal 

 lamina long; whorls 8; alt. 12, diam. 14J 

 mill. spiculosa. 



cccccc. Elevated, pyramidal, solid, subtranslucent ; 

 upper whorls finely costulate-striate; base 

 narrowly and but little excavated ; columella 

 having a blunt callous fold, spirally enter- 

 ing ', ^ basal lamina strong, about one whorl 

 long; whorls 8-9 ; alt. 17, diam. 16 mill., 



torrefacta. 



