72 THE DEVONIAN OF MISSOURI. 



Superfamily Craniacea 



Family Craniidae 

 Genus Crania Retzius 

 Crania famelica Hall and Whitfield 

 Plate 11, figures 1 and 2 



1872. Crania famelica Hall and Whitfield, Descriptions n. sp. Fossils, p. 17, pi. 11, 

 figs. 6, 7. 



1873. Crania famelica Hall and Whitfield, Twenty-third Rep. New York State Cab. 

 Nat. Hist., p. 236, pi. 11, figs. 6, 7. 



1897. Crania famelica Schuchert, U. S. Geol. Surv., Bull. 87, p. 190. 

 1909. PhUhedra famelica Greger, Am. Jour. Sci., XXVII, p. 376. 



Hall and Whitfield's description — "Shell small and thin, seldom exceeding one- 

 third of an inch in diameter, the largest seen measuring about four-tenths of an 



inch; usually flattened, discoid, the apex subcentral and scarcely elevated. Surface 

 marked by distinct lamellose lines of growth, which are often partly obliterated by 

 conforming to the surface of the bodies to which they are attached, as Spirifera and 

 Orthis. 



The only convex example seen, is about half as high as wide, but it is attached to a 

 very convex surface, which must occupy about half the convexity; usually they are 

 entirely compressed, with the exception of a small area surrounding the apex." 



Remarks — Crania famelica Hall and Whitfield is common in the Snyder Creek 

 shale and has been reported by Greger from the Callaway limestone. It is only rarely 

 well preserved, being represented most commonly by subcircular rings on other fossils. 



Order Protremata 



Superfamily Orthacea 

 Family Rhipidomellidae 

 Genus Schizophoria King 



Schizophoria striatula (Schlotheim) 

 Plate 15, figures 1-7. 



1813. A'nomia Terebratulites striatidus Schlotheim, Min. Taschenbuch, VIII, pi. 1, 



fig. 6. 

 1843. Orthis impressa Hall, Geol. N. Y.; Rep. Fourth Dist., p. 267-268, fig. 2. 

 1852. Orthis lentiformis Owen (non Hall), Geol. Survey Wisconsin, Iowa, Minnesota, 



pi. 3, figs. 10, 10a. 

 1858. Orthis iowensis Hall, Geol. Survey Iowa, I, pt. 2, p. 488-489, pi. 2, fig. 4. 



1858. Orthis iowensis var. furnarius Hall, Geol. Survey Iowa, I, pt. 2, pp. 489-490, 

 pi. 2, fig. 5. 



1859. Orthis iowensis Billings, Hind's Rep. Expl. Assiniboine and Saskatch., p. 187, 

 fig. 1. 



1865. Orthis striatula Davidson, Brit. Devonian Brach., Pal. Soc, p. 87, pi. 17, figs. 



4-7. 

 1867. Orthis impressa Hall, Pal. New York. IV, pt. 1, p. 60, pi. 8, figs. 11-19. 



1867. Orthis iowensis Meek, Trans. Chicago Acad. Sci., I, pt. I, p. 90, pi. 12, fig. 2. 



1868. Orthis Iowensis var. furnarius Meek and Worthen, Geol. Survey Illinois, III, 

 p. 424, pi. 13, fig. 9. 



