DEVONIAN FAUNA. 77 



- 3 Spirifera sp.?. l _ 3 Platyceras conradi. 



- 2 - Atrypa desquamata. - 2 - Platyceras dentalium. 

 123 Atrypa reticularis. I - - Platyceras thetiforme. 

 1 2 - Rhynchonella horsfordi. - 3 Platyceras thetis. 



- - 3 Rhynchonella occidens. 1 - - Platyceras undulatum. 



- - 3 Rhynchonella tethys. 1-3 Platyostoma lineata. 



- 3 Pentamerus comis. - 2 - Ecculiomphalus devonicus. 



- 2 - Leipteria rafinesqui. - 2 3 Euomphalus eurekensis. 



- 2 - Limoptera sarmentica. - 3 Calonema occidentalis. 



- 2 - Mytilarca sp.!. - 2 - Cyclonema (like C. midtilera). 



- 2 - Modiomorpha oblouga. - 2 - Loxonema approximatum. 

 1 Modiomorpha obtusa. - 2 3 Loxonema uobile. 



- 2 - Goniophora perangulata. - 3 Loxonema subattenuata. 



- 2 3 Edmondia pifionensis. - 2 - Bellerophon neleus. 



- 3 Sanguinolites combensis. 123 Bellerophon perplexa. 



1 - - Sanguinolites gracilis. - 2 - Scoliostoma americana. 



- 2 - Sanguinolites sauduskyensis. 1 - - Tentaculites attenuatus. 

 3 Conocardium iievadensis. - - 3 Tentaculites scalariformis. 



- 2 - Posidomya devonica. - 2 - Hyolithes sp. ?. 



- 2 - Posidomya laevis. - 2 - Orthoceras sp. ?. 



- 2 - Microdon macrostriata. - 3 Goniatites desideratus. 



- 2 - Schizodus orbicularis. 123 Phacops rana. 



- 2 - Cypricardinia iudenta. 123 Dalmanites meeki. 



- 2 3 Platyceras carinatum. - 3 Proetns marginalis. 



[No. 1, from the south slope of Brush Peak. No. 2, from the shale belt of Atrypa Peak. No. 3, from 



the west Bpur of Combs Mountain.] 



The shale belt of Brush Peak promises to the collector a most varied 

 fauna of Lower Devonian species. It measures about 150 feet in thickness 

 and may be traced along the west side of both Brush and Modoc peaks; 

 thence still farther northward, where its connection is clearly made out 

 with shale belt No. 3, of the Devonian section, south of Signal Peak. 

 On the southeast slope of Atrypa Peak the shale belt crosses the spur 

 striking N. 30 E., dipping 40 W. The beds are of a light bluish gray 

 color about 150 feet in thickness. The horizon corresponds to the fos- 

 siliferous shale belt in the section east of Lamotireux Canyon (p. 67). 



Combs Mountain presents upon its south side a fine display of massive 

 limestone beds dipping northward into the mountain. There is exposed 

 here between the base of the mountain and the summit of the ridge 



