382 Pro cc 'ri(/s of the Ohio Siaic .lanicnix of Sciciur. 



1H!I4. Diclavni luifj'da. Hall rind L'larke, Int. to Stud}- uf I'.rach., pt 

 ■2, 1 I. .V5, ligs. ]n-l-J. 

 Chester limestone: Sjiencer County, Indiana. 

 St. Louis i^roup : Washington County, Indiana. 

 180."). Diclasiiia fuiu/uia. Hall and Clarke, Pal. X. V., Vol. VI 11, pt. 2, 

 pi. 81, ligs. 1-8. 

 Chester limestone: Si;enccr Ccumty, Indiana. 

 St. Louis group: Washington County, Indiana. 

 18!i-"i. Tcrchratiil'j tiinjida. Whitfield, Geol. Siirv. Ohio, Vol. VII, p. 

 47:^. pi. M, figs. -21, 22. 

 MaxvilU' limestone: Maxville and Xewtonville, Ohio. 

 100(1. Diclasiini tiirnidum. Beede, Ind. Dept. Geol. Nat. Res., 8nth Ann. 

 Rep. p. ]:ii)0, pl. 22, figs. 53-58; pi. 10, tigs. 5-5a. 

 Salem limestoue: Indiana, Illinois and Missouri. 

 10(10. Dielasiiia fitrgidiinii. Grabau and Shimer, N. A. Index Loss., p. 

 3U2, fig. .'ud d-f. 

 Warsaw and St. Louis: Ohio, Kentuck}-, Indiana, Illinois, Mis- 

 souri, Iowa. 



Dcscriptio)i. — Sliell small, egg-slia]3e in general (outline, 

 elongate, nearly a.s thick a,s broad with anterior end truncated 

 and .slightly eniarginated. 



Fig. 12. — Dirlasiini tunjida. 



a and h. — Dorsal and profile views of the same specimen. (After 

 Whitlield.) 



Pedicle valve convex, with a rather deep median sinus in 

 the anterior half, lieak incurved, obliquely truncate, with a 

 round foramen. 



1 brachial valve convex with two small grooves in the anterior 

 ])ortion of the valve of souie specimens. 



Shell strtictiu-e finely jmnctate. and surface ornamented 

 with faint lines of growth. 



Length 7-11 mm.; width 5-10 miu. 



