96 



THE DEVONIAN OF MISSOURI. 



Remarks — Many of the Missouri specimens of Cranaena iowensis are large. The 

 largest is 36 mm. long, 31 mm. wide, and 22 mm. thick. Sections of the interior differ 

 from those published by Weller, but sections of some specimens from Iowa are similar 

 to those from Missouri. The main difference between the sections is the greater strength 

 of the curual ridges on the hingeplate of the Missouri specimens. 



Occurrence — Callaway limestone, Callaway County. 



CLD 



3-7. 



Fig. 8. Sections of Cranaena iowensis Hall. 



Cranaena iowensis Hall. Section of a brachial valve showing the extent of 

 the loop. 



Cranaena iowensis Hall. Cross-section of the pedicle valve in front of the 

 median septum and behind the beak of the brachial valve. 

 Cranaena iowensis Hall. Cross-sections of a brachial valve 33 mm. long 

 3 mm., 4 mm., 5.5 mm., 7 mm. and 8 mm. from the beak. 



Cranaena romingeri (Hall) 

 Plate 20, figures 17-19 



1863. Terebratula romingeri Hall, 16th Rep. New York State Cab. Nat. Hist., p. 48, 



figs. 22 and 23. 

 1867. Terebratula romingeri Hall, Pal. New York, IV, pt. 1, p. 389, pi. 60, figs. 17-25, 



66, 67. 

 1889. Terebratula romingeri Nettleroth, Kentucky Fossil Shells Monograph, Kentucky 



Geol. Survey, pp. 155-156, pi. 16, figs. 20-22. 

 1894. Cranaena romingeri Hall and Clarke, Pal. New York, VIII, pt. 2, p. 297, fig. 



215; pi. 80, figs. 13-19. 

 1897. Cranaena romingeri Schuchert, U. S. G. S. Bull. 87, p. 188. 

 1901. Cranaena romingeri Kindle, Indiana Dept. Geol. Nat. Res., 25th Ann. Rept., 



pp. 660-661, pi. 12, figs. 4 and 4a. 

 1909. Dielasma romingeri Grabau and Shimer, North American Index Fossils, I, p. 



302, figs. 376a-c. 

 Hall's description — "Shells ovate, more or less gibbous, truncate or slightly sinuate 

 in front. Ventral valve gibbous above the middle; umbo gibbous, inflated; beak promi- 

 nent, incurved over the opposite beak, and truncated by a round foramen which is often 

 mainly anterior to the apex, and completed on the lower side by two deltidial plates; 

 cardinal slopes rounded, often depressed in the middle towards the front. 



Dorsal valve extremely gibbous, little longer than wide; the greatest convexity 

 at the middle or above. 



