MARIJINKLLA. 15 



An evidence of the invalidity of these distinctions is furnished 

 in the inconsistencies of the catalogues in which they have been 

 employed. The lingual dentition, when fully studied in a 

 sufficient number of species, may yet guide us to proper groiips ; 

 but even of this I am less hopeful than formerly." Mr. Redfield 

 adopts Volvaria, Lamarck ; but for fossil species only. 



Jousseaume, in 18*75, made thirteen generic divisions of the 

 Lamarckian genus, viz. : MargineUa, Egouena^ Volvarinn^ 

 Serrata, Cryptospira, Gibberida, Graniila, Bullata, Glosia^ 

 Fersicida, Volvaria, Balanetta, Ganalispira. Weinkauff, in 

 1818, found that the distribution of species into the above 

 groups as made by Jousseaume was \ery unfortunate. In his 

 own monograph he has not attempted any grouping according 

 to the relationships of the species, but has presented them 

 almost at haphazard ; nevertheless in an Appendix he also 

 proposes a classification. He thinks that the presence of a basal 

 sinus in the aperture-margin, in many of the species, affords a 

 good character, and accordingly presents the following scheme : 



Division I. Species loith basal sinus. 

 flection 1. True Marginellas. 



<!roupa. (MargineUa. Yi.. & A. Ad.). M. glabella, T.inn. 



" b. {Glabella, H. & A. Ad.). M. faba, L. M. muscaria, Lam. 

 " c. [Eratoidea, Weiak. = MargineUa and Egouena, .Jouss. 



paitim). 

 «. With creiiated lip. M. margarita, Kiener. 

 ri. With smooth lip. M. australis, ]MwAs. 

 Y (= Serrata, Jouss. ex parte). M, serrata, Gask, 

 Section- 2. (Persicula, Gray). 

 Group a. (i?(i?to<apartim, Jouss. I. M. cornea, Lam., M. clandestina, 

 Brocc, M. oTulum, Sowb. 

 " b. {Persicula, Auct.). M. 'persicula, L. M. interrupta. Lam., 



M. chrysomelina, TJedf. 

 " c. (Gibberula). 31. miliaria, Linn. 

 R (Oranula. Jouss.). M. minutu, Pfr. 

 Section 3. Species with more or less apparent basal sinus, connecting the 

 first and second divisions. 

 Group a. { Closia, Gray). M. Largillierti, Kiener. 31. sarda, Ki-. 

 " b. ( C'r^p<os^9«-a, Adams, Jouss. ex parte). M. quinqueplicata, 



Lam. 31. elegans, Gmcl. 

 " c. ( Volutella, H, and A. Adams, Bullata T^^vvixvn, Jouss.). 31. 

 bullata, Bqrq, 3f. dactylus, Lam. 



