164 Prof, H. G. Seeley on the 



Transvaal in 1890-91. For many of these identifications I 

 was indebted to Mr. E. Meyrick, and they are used on his 

 authoiity.— W. L. Distant. 



Cramhus coyitaminellns, Hiibn. Pretoria. 

 Eromene ocellea, Haw. Pretoria. 

 Nephopteryx cqwiomella, Meyr. Pretoria. 

 Myelois Bohemani, Zell. Pretoria. 

 JEtiella zinchenella, Tr. „ 



Macna Hampsoni, Dist. Barberton. 

 Pyralis farinalis, Linn. Pretoria. 



illutalis, Zell. Pretoria. 



Dichocrosis amyntalis, Wall. Pretoria. 



Lyyropia qnaternaJis, Zell. ,, 



Eudasta Warreni, Dist. Pretoria, Johannesburg, 



Acharana otreusalis, Walk. Pretoria. 



Pionea africalis, Guen. ,, 



Pyraiista infuscah's, Zell. ,, 



Titaniojlorilegaria, Guen. Pretoria, 



Essina atribasalis, Rag. „ 



XXVII, — On the Skull of Mochlorliinus platyceps, from 

 Bethulie, Orange Free State, preserved in the Albany 

 Museum, Grahavistown. By H. G. Seeley, F.R.S,, 

 Professor of Geology, King's College, London. 



Sir R. Owen, in 1859, discriminated from Dicynodon some 

 fossil reptiles, which were named Ptychognathus. That 

 genus was defined by the sharp angular transverse ridge, in 

 which the more or less flattened top of the head meets the 

 strongly ridged long straight face. This character was made 

 more manifest in 1870, in the same author's ' Illustrated 

 Catalogue of South African Reptilia,' by references to the 

 ])lates in which those characters are drawn. The transverse 

 fold or ridge has been shown in every species of the genus 

 which has been figured. The name represents an important 

 generalization and has been generally used. 



Count Marschall recorded, in 1873, that the name had 

 been applied to two different genera, and the references were 

 brought under my own notice by the late Mr. G. R. Crotch 

 about 1869. Subsequently, with the aid of Professor F. 

 Jeffrey Bell, I examined the references to Ptychognathus, the 

 crustacean, which occur in the writings of Professor A. 

 Milne-Edwards and Mr, Miers, without finding that the genus 

 had become well known. Mr. R. Lydekker, F.R,S., in 1889, 

 urged that since Stimpson published the name in 1858, it was 

 not available for use by Owen in 1859. In some human 



