350 



W. H. Twenhofel — Pre-Cambrian and 



are not present in this form. It differs from Girvanella 

 Nicholson and E the ridge Jan. in the same respect. The 

 internal structure of the genus Ortonella Garwood from 

 the Lower Carboniferous of England is characterized by 

 decided dichotomous, radial tubes, none of which has 

 been observed in this genus. It differs from Solenopora 

 Dybowski in the same way. Except for the " water 

 biscuits " of modern lakes and Lithothamnium, there are 

 no other genera with which it may be compared and its 

 resemblance to neither of these is very close. 



Pig. 4. 



Fig. 4. Ottonosia laminata n. sp. Natural size. The thin section was 

 made from thee specimen on the left. The specimen on the right shows the 

 irregularities of the surface. Grouse limestone, near Otto, Kans. 



The generic name is based on the name of the village 

 near which the type species occurs in abundance. The 

 genotype is Ottonosia laminata n. sp. 



Ottonosia laminata new species. 

 Figs. 3 and 4. 



The characters of the species are given in the generic 

 description. The specific name is derived from the lami- 

 nated structure of the interior. 



Horizon and locality. Occurs in considerable abun- 

 dance in the Crouse limestone member of the Permian in 

 northern Osage County, Oklahoma, and Cowley County, 



