4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 97 



also a post-Cambrian brachiopocl. Unfortunately the specimens of 

 L. davisi are poorly preserved ; consequently it is difficult to deter- 

 mine whether Cambrian forms are congeneric. 



Distinctions of generic rank between the Cambrian species referred 

 to bolus and those placed in Lingulella seem to be wanting. In 

 fact the assignment of species to these genera has been on the basis 

 of shape alone, the wide forms being called Oholus. Pending revi- 

 sion of these brachiopods, Cambrian species which formerly would 

 have been placed partly in Oholus and partly in Lingulella are prefer- 

 ably referred to Lingulella. 



Lingulella bridgei, n. sp. 



Lingulepis acniangula Bridge (part), U. S. Geol. Surv. Prof. Paper 186-M, 

 p. 244, pi. 68, figs. 4, S, 1937. 



The stratigraphic position of the sandstone containing this sjjecies 

 has not yet been determined with certainty. 



This is a large form for which reason Bridge confused it with 

 Lingulepis acutangula. However, it lacks the necessary restriction 

 of the ventral valve at the apical end, tapering too slowly and evenly 

 to be referred to Lingulepis. 



The ventral valve figured by Bridge is broken away on the sides 

 toward the apex, thus causing it to approach the form of Lingulepis. 

 A smaller, more perfect ventral valve shows the true proportions of 

 the shell, and while the valve comes to a rather sharp point, the mar- 

 gins approach the apex as slightly convex lines. The dorsal valve 

 figured by Bridge is fairly complete but evidently somewhat flattened. 



L. bridgei has the usual shell composition. A ventral valve about 

 15 mm long is IQ mm wide. 



Upper Cambrian, Lion Mountain ? ; | mile east of Sandy, Blanco 

 County, Texas. 



Cotypes. — U.S.N.M. no. 93009. 



Lingulella burnetensis, n. sp. 



Obolus matinalis Walcott (part), U. S. Geol. Surv. Men. 51, p. 400, pi. 8, 

 figs, la, b, 1912; Bridge (part), in Sellards, Adkins, and Plummer, 

 Univ. Texas Bull. 3232, pi. 2, fig. 14, 1932. 



This is a rather wide form, which is perhaps the reason for its 

 reference to 0. nmtinalis in spite of its larger size. There is some 

 question as to the specific identity of the specimens from the two 

 localities. Since the holotype is in sandstone it may come from the 

 Lion Mountain sandstone member. The other specimens (loc. 67) 

 are clearly in the Aphelaspis zone. 



