156 THE DEVONIAN OF MISSOURI. 



Suborder Rhipidoglossa 



Family Euomphalidae 



Genus Euomphalus Sower by 



Fragments of specimens referable to this genus are rare in the St. Laurent lime 

 stone, 3 miles south of St. Marys. 



Order CTENOBANCHIATA 



Suborder Platypoda 



SuperfamiJy Taenioglossa 



Family Capulidae 



Genus Platyceras Conrad 



Platyceras carinatum Hall 



Plate 35, figures 17 and 18 



Description and synonomy on page 121. 



Figured on plate 26. 



Rematks — Only one specimen complete enough for identification has been col- 

 lected. It is unusual for the species but is remarkably like Hall's figures 20 and 21 of 

 plate 2. 



Occurrence — Grand Tower limestone of Little Saline Creek. 



Platyceras nodosum Conrad 



Plate 39, figure 11 



Description and synonomy on page 122. 



Figured on plate 28. 



Remarks — Only one fragmentary specimen of this species has been collected but 

 it is identified with a fair degree of certainty. 



Occurrence — Grand Tower limestone of Little Saline Creek. 



» 



Genus Diaphorostoma Fisher • 

 Diaphorostoma genevievensis n. sp. 

 Plate 39, figures 7, 8 and 9. 



Description — Shell small. Spire elevated above the body whorl; one to two volu- 

 tions above the body whorl. The body whorl expands rapidly. The aperture seems to 

 be nearly circular though it is not well enough preserved in the specimen to determine 

 its outline positively. Surface marked by fine concentric striae about 10 to the milli- 

 meter. The cotypes measure 8 mm. as greatest width of body whorl, and 6 mm. as 

 greatest height of shell. The apical angle is 96 degrees. 



The shell is remarkable for its small size and perfection of minute striae. 



Occurrence — Grand Tower limestone of Little Saline Creek. 



