94 THE DEVONIAN OF MISSOURI. 



1897. Eunella lincklaeni Schuchert, Bull. U. S. Geol. Surv., 87, p. 223. 



1901. Eunella lincklaeni Kindle, Ind. Dept. of Geol. and Nat. Res. 25th Ann. Rept., 



p. 658, pi. 12, figs. 3, 3a. 

 1909. Eunella lincklaeni Grabau and Shinier, North American Index Fossils, I, p. 303, 



fig. 378. 

 1911. Eunella licnklaeni Cleland, Wisconsin Geol. and Nat. Hist. Survey, Bull. No. 



21, p. 72. 

 1913. Eunella lincklaeni Prosser and Kindle, Maryland Geol. Survey, Middle and 



Upper Devonian, pp. 179-181, pi. 15, figs. 18-23. 

 Hall's description — "Shell ovate or subelliptical, usually broader below'the middle, 

 varying from moderately convex to very gibbous and sometimes subcylindrical; front 

 rounded subtruncate or a little depressed. Ventral valve varying from moderately 

 convex to gibbous, somewhat regularly arcuate in longitudinal outline, sometimes a 

 little flattened towards the front or marked by a narrow mesial depression. Beak more 

 or less abruptly incurved and truncated by a foramen of moderate size; umbonal slope 

 rounded or subangular, and concave towards the cardinal margin. Dorsal valve vary- 

 ing from moderately convex to gibbous; the greatest convexity about the middle of the 

 length, and thence curving regularly to the sides and base. Surface marked by fine con- 

 centric striae of growth, which are sometimes crowded together towards the front, 

 causing a thickening of the shell. Shell structure distinctly punctate. This species 

 presents some variety of form from subelliptical to broad ovate. The length of a large 

 individual is a little more than three-fourths of an inch, with a width of five-eighths 

 of an inch and a depth of three-eighths; while another form which I refer to the same 

 has a length and width of half an inch with a depth of a little more than a quarter of 

 an inch. Some of the smaller individuals are a little more than a quarter of an inch 

 in length." 



Remarks — Eunella lincklaeni is abundant in the Mineola of Callaway and Mont- 

 gomery Counties. Most of the specimens are small, averaging less than 13 mm. in 

 length, though the largest specimens are as large as Hall's largest. Many specimens 

 were ground so as to show the loop and other internal structures. No specimens were 

 preserved in such a way as to show such structures without grinding. 

 Occurrence — Mineola of Montgomery, Callaway and Ralls Counties. 



Genus Cranaena Hall and Clarke 



Cranaena calvini (Hall and Whitfield) 

 Plate 16, figures 3-5; plate 18, figure 5 



1873. Cryptonella Eudora Hall and Whitfield (non Hall, 1867), 23rd Rep. New York 



State Cab. Nat. Hist., p. 225. 

 1873. Cryptonella Calvini Hall and Whitfield, Ibidem, p. 239. 

 1891. Cryptonella Calvini Whiteaves, Cont. Canadian Pal., I, pp. 235-236. 

 1894. Dielasma Calvini Hall and Clarke, Pal. New York, VIII, pt. II, pp. 294-296, 



pi. 80, figs. 20-22. 

 1897. Dielasma calvini Schuchert, U. S. G. S. Bull. 87, p. 212. 



1908. Cranaena morsii Greger, Am. Jour. Sci., XXV, pp. 313-314, figs. 1-7. 



1909. Cranaena morsii Greger, Am. Jour. Sci., XXVII, p. 376. 



Greger's description of Cranaena morsii — "Shell large for the genus, subcircular, 

 valves nearly equally and uniformly convex. Marginal line along the lateral and 

 anterior juncture of the valves, forming a sharp, thin edge. No defined fold or sinus. 

 Surface covered with very faint, even, concentric lines of growth; otherwise the surface 

 is smooth. Shell structure abundantly punctate, the punctae very minute and ar- 

 ranged as in the related Cranaena iowensis (Calvin). 



