•262 



M. BIPLICATA, Risso, ( Voharia) probably belongs to another 



genus. 

 M. BIPLICATA, I. Lea, (in Contr. to Geol.) is a Ringicula. 

 M. CANCELLATA, Du Bois, Conch. Foss. 1831, is a Ringicida. 

 M. CLANDESTINA, (Brocchi) see among recent species. 



8. M. columba, I- Lea, Contr. to Geol. p. 177, pi. 6, f. 187, 



l^^oo. OJigocene ; Claiborne, Ala. 



9. M. COniformis, So-wb., Quart. Journ. Geol. Soc. vi, -15, 



1850. 

 Sowb., Quart. Journ. Geol. Soc. xxii, 288, pi. 17, f. 2, 

 1866. Miocene ; Cumana, JSt. Domingo. 



10. M. COnstricta, Conrad, Fossil shells of Tert. Form. U. S. 



1st ed. 83, 1832. 

 Conrad, Fossil shells of Tert. Form. U. S. 2d ed. 46, pi. 

 16, f. 15, Oct., 1833. 

 Erato ? eonstricta, Conrad, Am. Journ. Conch, i, 25, 1865. 



Oligocene ; Claiborne, Ala. 

 M. CONSTRICTA, Emmons, is JI. contracta, Conrad. 



11. M. contracta, Conrad. Here proposed for Emmons' name 



preoccupied. 

 M. eonstricta, (not Conrad) Emmons, Rep. Geol. Surv. N. C. 



1858, p. 261, f. 185, 1858. 

 Porcellana {Glabella) eonstricta, Conrad, Cat. in Proc. Ac. X. 



Sc, , 1862, p. 561, 1862. Miocene of North Carolina. 



12. M. COnulus, H. C. Lea, Trans. Am. Phil. Soc. ix, 273, pi. 



37, f. 102, 1815. 

 Porcellana {Volutella) conulus, Conrad, Cat. in Proc. Ac. N. 

 Sc. 1862, p. 563, 1862. Miocene ; Petersburgh, Va. 



M. COSTATA, Eichwald, is a Ringicida. 



13. M. crassilabra, Conrad, Foss. Shells Tert. Form. U. S. 



1st ed. p. 33, pi. 16, f. 8, Aug., 1833. 

 M. anatina, 1. Lea, Contr. to Geol. p. 176, pi. 6, f. 186, 



Nov., 1833. 

 M. crassilabra, Conrad, Foss. Shells Tert. Form. U. S. 2d 



ed. p. 45, pi. 16, f. 13, 1834. 

 Erato crassilabra, Conrad, Am. Journ. Conch, i, 25, 1865. 



Oligocene ; Claiborne, Ala. 

 M. CRASSILABRA, I. Lea, is M. humerosa, Conrad. 



14. M. Cuvieri, Desh. Traite Elem. pi. 123, f. 8, ? 1850. 



Mab. unknown. 



