- 245 - 



tion, characterize?- "by dark lines on the (. l^y. 



Of 5u"opy's two t^-pes -^f ?. voxillata orxe, v;hich '-loes not 

 have the ap-oearance of a 3oY/den shell, is a tj"pical r-ih'oosa, as 

 Dall ha. ' rady pointed out; the other is v;ithoTit the dark lines 

 an''^ orohabl^ is a thickened of the form here called densata. '^he 

 latter has the a-^pea of a shell from the 3o7i-den "beds. Gabb (1) 

 has reT)orted gib bos a from Santo Domingo, but STDecii-nens tmder that 

 na-ne apparently are no lorp-er in the collection. 



Ocourrence .- Oligocene: Peninsular linestone, i'^lorida 

 (Dall, 1898, 1913); Tampa Gilex be:ls, i^lorida (Dall, 1898, 1915); 

 Ghipola marl, Florida (Dall, 1898, 1915); Oak Grove sand, Florida 

 (Drll, 1898, 1915); Cuba (Cooke, ); Guallava beds, Oosta 

 Rica (Dall, 1398, 1915); lower Hiocene : Bowden be Is, Bowden, 

 Jamaica (Guppy, 1874; Dall, 1898, 1915); Miocene: Oalvert- Hew 

 Jersey (Oonra?, 1845; Dall, 1898, 1915), Maryland (Glenn, 1904). 

 St. Mary's- ITorth Jarilina (Gardiier, LIgs,), Yorktown- Tirc-inia, 

 Forth Carolina (Gardner, I.Iss.). 



