GLOSSINA 37 



LINGULA INDIANENSIS Miller and Gurley 

 Plate I, Fig. 7 



1894. Lingula indianensis Miller and Gurley, Bull. No. 3, 111. State Mus. 

 Nat. Hist, p. 69, pi. 7, fig. 1. 



Description. Shell rather large for the genus, subovate in outline, the 

 length about one-half greater than the width, the greatest width anterior 

 to the middle. The dimensions of the type specimen are : length 21.8 mm., 

 width 14.9 mm. 



Valves gently convex, the anterior margin subsemicircular, the lateral 

 margins gently convex, the posterior extremity much narower than the 

 anterior, the postero-lateral margins meeting at the beak in a very broadly 

 obtuse angle and rounding rather abuptly into the lateral margins; the 

 beak not prominent. Surface marked by fine concentric lines of growth 

 towards the beak, which become coarser, more irregular and more or less 

 undulatory towards the margins. 



Remarks. This species may be recognized by its subovate outline, its 

 rather large size, and its more or less irregular concentric markings. It 

 is most closely allied to L. varsoviensis, from which it can be distinguished 

 only by the absence of fine radiating costse from the median portion of the 

 valve. 



Horizon. Crawfordsville shale. 



Genus GLOSSINA Phillips 



Description. Shell thin, broadly ovate-subtrigonal in outline, acuminate 

 posteriorly and rounded anteriorly. Surface of the shell usually shining 

 as in Lingula, and marked by concentric lines of growth. The internal 

 markings of the valves obscure and imperfectly known. 



Remarks. This genus has been established to include a few linguloid 

 species which differ from Lingula proper in the subtrigonal outline of the 

 shell. The internal characters of the shell are not sufficiently well known 

 to make it possible to determine whether or not the arrangement of the 

 muscular scars corresponds with that of Lingula. 



GLOSSINA SEDALIENSIS (Miller) 

 Plate I, Fig. 11 



1892. Lingula sedaliensis Miller, Adv. Sheets 18th Rep. Geol. Surv. Ind., 



p. 54, pi. 9, fig. 2. 

 1894. Lingula sedaliensis Miller, 18th Rep. Geol. Surv. Ind., p. 308, pi. 9, 



fig. 2. 



Description. Shell triangularly subovate in outline, longer than wide, 

 the greatest width towards the anterior margin. The approximate di- 

 mensions of a large but very incomplete example are: length 17 mm., 

 width 13 mm. 



