LIMESTONES OF WESTERN TENNESSEE 715 



Uncinuhis micleolahis; loa, lob, 21, 104. 



Uncinulus, with 2, occasionally with 4, plications on mesial fold, and 3 or 4 

 lateral plications; largest specimen 1 1 «"" long, 1 1 ""^ wide, 10""" thick, 

 angular ; lob, 21. 



Uncinuhis, related to vellicatus, but smaller ; the mesial fold only slightly 

 elevated ; ventral valve flattened toward the lateral margins and then 

 abruptly bent toward the suture ; \ob, 



Uncinulus schucherti, resembling Wilsonia saffordi, but that part of the ven- 

 tral valve occupying the fold projects far less beyond the lateral margins 

 of the shell ; the dorsal valve is more evenly conv^ex; the anterior face of 

 the shell is not flattened, so that a lateral view is less angular; plications 

 on mesial fold vary from 4-5 ; of the lateral plications 7-10 are dis- 

 tinct, and 2-4 indistinct; largest specimen ij™™ long; globular or 

 moderately elongated ; \oa, lot, ii. 



Rhynchojiella transversa ; \ob, ii. 



Rhy7tcho7iella bialveata ; 21. 



Rhynchotreta; cuneate triangular form without distinct sinus or fold ; 21. 



A try pa reticularis; \oa, lob, 21. 



Cyrtina dalniani ; 21. 



Delthyris perlamellosus; ga, 10a, 10b, 21, 22, 104. 



Delthyris, related to perlamellosus, but with flat, high, triangular on ventral 

 valve, giving the shell a slight resemblance to a Cyrtina; 10a, lob, 21. 



Spirifer cyclopterus; loa, lob, 22, 104. 



Spirifer, with radiate striae and 3 or 4 lateral plications ; possibly identical 

 with Sp. tenuistriatus, the horizon of that species not being definitely 

 known ; \oa. 



Nucleospira; flatter than in ventricosa; iob,2i. 



Lissopleura; smooth, oblong, quadrangular form ; 21. 



A7ioplotheca concava; 21. 



Rhynchospira globosa ; 10b, 21. 



Rhynchospira fotmosa; lob, 21, 22, 104. 



Meristella Meeki; 10a, lob, 21, 22, 104. 



Meristella; related to princeps ; c)a, loa, 21, 104. 



Platyceras tenuiliratum ; loa, 21. 



Dalmanites pleuroptyx; \oa, \oh,2i. 



Phacops logani; loa. 



Aug. F. Foerste. 

 Dayton, O. 



