:. 



croiis volution^, iiili-rnal ' 

 median projection. 



Si BFAMILY EUOMPHA ' 



Shell depressed, planorhiforni : \\li 



l>t in Keeyliomphalus, in which tln-\ 

 spin- tlattened or involute. 



(8ol 



Genus SOLA 11 1 I'M. 



Shell depressed conic, angular at tin- pnlp!; i\ ; *p 

 subquadrangular, lip simple ; innbilicn- 

 spiral, wide and perspective. 



Animal with lar^e loot , notched in front. 

 pronounced marginal fold: head large, Pan 

 tentacles which are short, thick, cylindrical and 

 suture below; eyes on swelling near the <nt.-r '"-' 

 tentacles; gill-cavity divided i.y a Ion-it udinal !'.! 1. (I'l. 1. 

 figs. 1, 2). 



Architectonica (Bolt. 1798), Qraj "i. 



Inhabits warm seas, world-wide. Possil, mow Dan 

 Eocene. 



Subgenus SOLAUIIM. L-iiuan-K 



Surface of the shell strongly and closely seolptU 

 tudinally, spirally sulcate and ril.t.ed. Opciculum C 

 paucispiral, with the nucleus sul.ex 



Solariorbis, Conrad, is a >ynonym. 



Subgenns PHILIIMM.',. 



Shell without lon-itudinal sculptun . 

 obsolete. Operculum flftttenedj whorli Bam 



nucleus subcentral, internal fl 

 process. (PI. 1, lig. 



. Deshayes, 180:; 



PLATYSCHISMA, Ht3 



Shell depressed, trochiform ; whoi 



ornamented with small transverse B< ! " >rl - 



