in >i.\ 



i 



ii k 'n.ii|i. ciil.iint-.nilrs Nil. n. MI- < i ill- an. I E 



- fMloncoU;Geolin{lcal iK-partnu-nt, University 



of M 



r. ' 



\i:<IIIVM> MICAKINATA, . >/'. 



I'l \u I \l I I'.- u .t 



Shell -in. ill, olilii|iifly MI!T.. mr;il. rliiptical in outline; apex submarginal, small, 

 scarcely incurved in the cast; dorsum obtusely carinate for a short distance from 

 tin- apex, lateral -lope- slightly Mattnpil; lii^lit of shell (the jwsterior part especially) 

 1688 than tiMial, i'i|iiallin^ about two-lifth- of the \vi-ltli. the lii^hest point just 

 iHjhiml tin- ^nrface nearly smooth. Length 12.5 mm.; width 10mm.; bight 



< in in Five specimen 



Tlit; dorsal angulation allies this species t<> I. /..//.///'//;!/% Hall sp., but it does 

 not extend liarkwaol so far, the apex is much smaller and less incurved, and the 

 whole *hcll more depressed than in that species. It is distinguished in a similar 

 manner from 1. 



formation and locality. Trriiimi k'n-up, CliUmUinltti* ami KiiHlplrm beds <;'Mlhui' county, 

 Mlnne*oU. 



OoUeeHnu.-l R B i.l. 



Ai;< HINACKI.I.A SIMl'LATRIX, H. 9p. 



I'l.ATK I. XI. KIOS. 10 i,.l II 



1 -m. ill. aperture hori/ontal, subovate, somewhat wider in front than 

 behind; {>ex incurved, just aloveor projecting slightly beyond the anterior margin; 

 back high, -harply round. -d. the lateral slopes flattened. Surface markings obscure, 

 concentric. Two specimens, one from Minnesota, the other from Kentucky. The 

 dimensions of the former are as follows: length 10.5 mm.: width 8..") mm.; greatest 

 bight :U mm.: bight of apex 1.7 mm. In the other the same measurements give 

 !". 1 -'..". "...') and 'J> mm. 



This species is di-tin^iii-hed from .1. <!>/.'. i. .1. /a//</</, .1. ..> iV,//-//i</^ and .1. 

 patellir'ormis in having a less regularly ellipt i< -al outline, the anterior half being wider. 

 In tbi< particular it is like the much larger 1. > < 



Formation a*d localitg. Hlark 1. !,yll,,p.,rina I- . Mlnn.-v.U: Tr-nl-,. 



Mollnlodonbed, Frtnkfort. K.-nt 



OoUeetitm. K. O. Dlrl. 

 U 



