68 



Studies in Ge^oi^ogy, No. 3 







Bieorinal* forms with rifuol ihr««(i» otav. 

 p«>1>rior carina-, ntioris appear banded 



INCA 



3Wgh+li( bioorinote forms vrifh 2 prom.n« 

 ing Subsidior^ ihr€ads abov^ tft< poatvri 



INCA vor. TRITA 



Forms wirti one cor 

 V whorl»; 



I 



Hit txno otsoIrK 





whorl*; mtr,^ f,n. int.r.tihol thrtodi, tht joerocor.n*! 

 iurfter convt%, wilfi an enqular c<.f»votioo «i r<i« poit« 

 p«'1 •( Ttif r»tiorl 



NEL30NI 



k 



Fofmj Tvi'rti rht etrino obsolcW, ifjf whorls 

 0>v)nded, ihe scuWore much o« in HELSohi 



KELSON! wr. KOTUNDATA 



/orms Tfirt) convci, r«und«d tvhorls, mtK rf>< 9evlp- 

 *4uf» aj in »NFR»^CPilf iKATA 



IXFRACARINATA /«-.Z,0KRITEM5l5 ♦- 



Small {«n(ia tyif^ *^t nt^t\ic inhtrU mono^arinaie, 

 itit dddl whorls rour><l«), T(ir»is ti>lr^i>*l and 

 iVwtf, m«r# widflu tpe«<) r<>«n in At .jown/ a| 4- 

 rtCLSom 



PRENOJtCIA rw. JKCONSPICUA 



{l?ffl Nnis ir)dico1< rariclol rjloiionsbip 



T'orma iv.tli one promt nrrtt carina, r+>f tculpffr* 

 nuoh a» in r(ei-SoH; (4rnain loprocaririal Thrra^s) 

 tht «uorocorinot sor^*acr P'a^, end noindrota- 

 fi'on «t fw post<rior farT of rfw whor) 



TRULLI55ATIA 



Shope of whorl at 10 var. Tif jti3S«)Ti« , bid 

 normolltf wirS 5 aremintnl Supra«arinal rtir*«fll, 

 .anci rfi» inlfrrfitial *r»«ij abfiil la cbseltTr 



INFRACARINATA 



7o»i9 wi."! mono oar. naTo 

 nnorii, r»iA rU smlotorr 

 . in rof. mroKSPlfilA, r«,f 

 T^ Stf^rocarinol »ur/»rr flat 



PRENUNCIA 



Diexgreon. showing inter/icv.! 

 jrelevt ions hips of ^rouj? oP 

 TurrxlellA nelson i 



oTTfftuaV 



1fOBU5TAvi.r/)Bi?upm 



