10 



Fletcher published an essay on the Dudley Trilobites, 

 in which he points out the obvious discrepancies which 

 heretofore existed in regard to the identification of the 

 species Oyhele punctntus and C. variolaris. 



In 1851, McCoy, in the Palaeozoic Fossils of the 

 Woodward Museum, on p. 156-8, mentions the following 

 species : Encr'murus Stokesii, Zethus sexcostatus.-xni^ Z. 

 variolaris. 



Angelin's Palseontol. Scaudinavica appeared in 1852, 

 with the generic formula of Cryptonymus. This author 

 also describes the following species : Crypt, ptmctatus, 

 syn. Encrinurus variolaris, &i Stokesii ; and in addition, 

 the Crypt, bellatulus, C. abtusus, C. Icevis, C. caudatus, 

 and Crypt, verrucosus. 



In the Memoirs of the Geol. Sur., United Kingdom, 

 Decade vii, on jilate iv, fig. 1-16, Salter describes and 

 figures Encrinurus sexcostatus, E. punctatus and E. var- 

 iolaris, and remarks : "If the strict rule of priority were 

 observed, irrespective of clear definition, we should be 

 compelled to adopt the name Cryptonymus for this ge- 

 nus, as that of Zethus for Oyhele. Doctor Kutorga, 

 indeed, in the Tran. of the Royal Mineralogical Society, 

 St. Petersburg, 1848, advocates this course, and has re- 

 stored the name Gryptonymus, under which Eichwald 

 at first described several varieties of the common Asaphi 

 of the Russian Silurian rocks. Subsequently, (1840) 

 aware of his error, he restricted Cryptonymus to such 

 trilobites as the Calymene variolaris, Brong., including 

 the Calymene punctata, ?in6. some forms of Cybele. But, 

 though thus marking out the group he intended, he 

 gave no description of the amended genus; besides which, 



