PLATE XVIII. 



KiGURE 1. Pohimorphin.n prohlfimi D'Orliigny? Front \it'W. X liO. 



2. PohjmnTphiiKi tiiniifiilahiiili'x Rcnss. ii, Front view; li. s'nh- view. X ^-O. 



3. Poli/morpliimi i/ihliii \)'(\r\i[i;ny. t\sta\os._- iorm. «, Front virw; /<, cijijiositc siilc X tlO. 



4. Poljimorphitiii rfiiliiii 1[. 1!. P.raily, Parker and Joni'S. Front \ic\v, < 10. 



5. UrifieriiKi liijrdinfusix ("uslinian, n, sj). Front view of a speeimen witbont fully ile\elope(l last chambers. 



X 120. 

 112 



