34 THE DEVONIAN OF MISSOURI. 



Paleontology. — So many members of the Callaway bear 

 large numbers of fossils that the entire formation gives the im- 

 pression of being fossiliferous, though some members are almost 

 barren. The Callaway has decidedly different faunules in 

 different members and at different localities though the assemb- 

 lages have the same general aspects save where zones of corals 

 appear. 



Atrypa reticularis (Linnaeus) is responsible for the abund- 

 ance of fossils in the Callaway. It is very abundant and highly 

 varied in size and appearance. 



Coelenterata. — Corals are abundant though only five species 

 have been identified. Acervularia davidsoni Edwards and Haime 

 is the most abundant. Some beds are almost completely com- 

 posed of it. Favosites limitaris Rominger is as widely distributed 

 as A. davidsoni Edwards and Haime but is by no means so 

 abundant. Favosites alpenensis Winchell is common. An un- 

 identified Stromatopora is common. 



Crinoidea. — Crinoid stems and fragments of plates are 

 abundant, but the writer has not seen an identifiable specimen 

 of crinoid head. Greger 1 lists a species of Megistocrinus and one 

 of Melocrinus. 



Brachiopoda. — Brachiopods are the most important group 

 and, as stated in an earlier paragraph, Atrypa reticularis (Lin- 

 naeus) is the most abundant species. Syringothyris occidentalis 

 (Swallow) is the most characteristic form as it is unknown in 

 any other formation and is widely distributed though rare. 

 It has long been known as the oldest of the genus and was the 

 first described from the Devonian. An older form has been 

 found in the Mineola. Newberria missouriensis Swallow is 

 abundant in a member about six feet thick on Cedar Creek, 

 about 20 miles southeast of Columbia. It has been collected, 

 also, from near Lupus in Moniteau County, but the specimens 

 are all badly broken in that locality. Cyrtina missouriensis 

 (Swallow) is a characteristic form, readily distinguishable from 

 C. hamiltonensis Hall by the plications on fold and sinus. 



Pelecypoda and Gastropoda. — Pelecypods and gastropods are 

 very rare. Only three species are known and Paracyclas elliptica 

 Hall is the only species of which several specimens have been 

 collected. 



Pisces. — Fish remains are very rare and belong to only 

 four or five species. Teeth of Ptyctodus calceolus Newberry and 



'Am. Jour. Sci., vol. 27, p. 377. 



