- 429 - 



r!istiji'-(iisli the varietj- from th ^ ' ' 7l serratr-u::i. 



The Sr^.r.to ^onin^-ian Laevicarcliuinf-T nnder the name 0_, veniistitg 

 G-£:';u ■ ■jj.jrssentatives of tliia ajjcaiev-. . Toiila's Gatim 



£• 3alli . a name preocctipied "bj? Heilprin, ' ~ " ly sorrgti-'j: . 



althoiA'^'h it a]p:iears to have more prominent radial ma.rkings. 



Ooe^irrenoe .- Upper Oligocene : Santo Domingo (Gahh, 187"); 

 Satim formation, Pari-^r.-ja {? ?oiila, 1909; Brovm and Pilshrj-, 1911); 

 Lov/er Mioeene ; ^ov- uen oeds, ^-o-.vden, Jamaica ' p^' and Dall, 



1396; Dall, 1900). Miocene: Ghoctav/hrtchie formation, Florida 

 fDall, 19CC). ^lioeene. Santa "'aria Tatetla, Vera Oru%, llexico; 

 (Bose, 1905); Jaloosahatchie marl, _'loriaa (uall, nCO); li.iion, /l 

 Oosta ?.iGa (GaTDl), 1881). Pleistocene: South Flori' ^ " 



Antilles (Dall, 19^0). Hecent: '"eras to in 1 to 



75 fathoras. 



