r?; ; '\ n 



Genus JrJEIITOO'-AI.LA Fischer. 

 3GHIi:0GHAi.ii ^ ..i^iUATA uall. 



Ghsma aroinella Guppy, 18,6, Q.iiart. Jour. Geol. Soc . Londoi-:, vol. 



22, p. 204. (non linnaeus, 1767). 

 Ghana aroinella C-abb, 1875, Trans. Am. Philos. Soo . , nev: ser., 



vol. "! " , . Pol (non r.innaei''S, 1767). 

 Ohama aroinella S-uppj', 1874, Geol. i--ag. , decade £, vol. 1, ■!. 442 



(checli: list), e" parte, non linnaeus, 1767. 

 '-'hama aroinella Gu-^pjz, 1876, f^-'^a.rt. Jour. -eol. Soc. london, vol. 



r.':, p. 531 (non linnaeus, 1767), 

 1] oh i n c har.i a an t i n ua t a Dall, 1903, Trnns. '.Tagner Free Inst. v'5ci., 



Philadelphia, vo^ . "^ ■■it. , m. 1^0^-1405, pi. 54, 



fip-. 9. 



"DescriotioTi .- ''Shell lar^-e, subquadrat-^ ^ vl th an almost ob- 

 soletel^' rectilinear base, sli^c-htly arche'-"- posterir: " "-srsal 



edges, and excavate' anterior end; valves less oonver- in 22* 



aroin'lla an''' with less ■orominer'f^ " • ■-i i.-cn.o-^^ ^ 



impressed lunule; the nu-vher ' "rom t -tvvo to 



thirt^'-one, low with subequal ii.' , ' . very short 



and f^cslp-like eTrce-^-'" (^^^ -■:■' - •■.-.-.■i ^ r^<=-'^>ian rib; where thej" are tri- 



