242 GEOMITRA. 



Subgenus CASEOLUS Lowe, 1852. 



Caseolus LOWE, Ann. Mag. N. H. (2), ix, Feb., 1852, p. 115, for 

 sphcerula, compada, abjecta; P. Z. S., 1854, p. 184, type H. compacta 

 Lwe. -- \-Hystricella LWE., P. Z. S., 1854, p. 186, type H. bicarinata 

 So\v.+Discula LWE., t. c., p. 116 ; P. Z. S., 1854, p. 187, type H. 

 polymorpha Lwe.-f Tectula LWE., t. c., p. 117 ; P. Z. S., 1854, p. 191, 

 type H. bulveriana Lwe. Turricula]Woi^., Test. Atlant., p. 168, 

 type H. cheiranthicola Lwe. (1878). Not Turricula (Klein) H. & 

 A. Ad.= Turris Montf. 



Shell perforate or umbilicate, varying from globose-depressed 

 with rounded periphery, to subdiscoidal or to pyramidal, with 

 keeled or double-keeled periphery. More or less granulated. 

 Aperture rounded or oval, the lip blunt, usually a little expanded 

 at columella. Type G. compacta, pi. 68, fig. 19 (see also G. (Hys- 

 tricella) bicarinata, pi. 68, fig. 12 ; G. (Discula~) polymorpha, pi. 68, 

 figs. 8, 9.) 



(Perforate ; globose-depressed or globose-conic, periphery rounded 

 or bluntly angular, parietal lip adnatc ; surface striate and granu- 

 late above, smooth or granose below ; color whitish. CASEOLUS). 



G. consors Lwe., iv, 39. G. sphserula Lwe., iv, 39. 



G. calculus Lwe., iv, 39. subcallifera Lwe. 



G. compacta Lwe., iv, 39. G. abjecta Lwe., iv, 39. 



innominata Gray. v. candisata Mke. 



G. commixta. 



(Perforate, trochiform, with acutely keeled or double-keeled per- 

 iphery ; parietal lip raised and freej; surface sharply granose through- 

 out; color dusky. HYSTRICELLA). 



G. echinoderma Woll., iv, 34. G. vermetiformis Lwe. 

 G. echinulata Lwe., iv, 33. G. turricula Lwe., iv, 33. 



G. bicarinata Sowb., iv, 33. v. pererosa Woll. 



duplicata Lwe. G. leacockiana Woll., iv, 34. 



G. oxytropis Lwe., iv, 33. 



( Umbilicate, much banded and varied with brown ; depressed, 

 subdiscoidal or pyramidal, carinated ; surface smoothish, inconspic- 

 uously granular. DISCULA). 



