11 



he is now applying the name to a totally different set 

 of fossils to those for which it was originally intended. 

 Under such circumstances, it is impossible to retain his 

 name in opposition to the genus clearly indicated, 

 though not sufficiently described, in Emmrich's acien- 

 tific arrangement of 1845." 



Eichwald's essay on tlie genera Cryptonymus and 

 Zethus, published in 1855, says: "Soon after ray jour- 

 ney from Wihia to 8t. Petersburg, I had the opportunity 

 to renew my observations in the neighborhood of Zar- 

 skoje-Selo and Pawlowsk, and shortly afterwards, on 

 several different occasions, in Esthland. My collection 

 of trilobites consisted not only of the species which I 

 had described, but also of many new forms. I referred 

 the species, which had hitherto been classed under my 

 genus Cryptonyynus, to Illcenus, for this genus had 

 meet with universal acce])tance, to the detriment of my 

 Cryptonymus. In the year 1840, I gave to Cryptony- 

 mus a new signification, and referred the Calymene 

 punctata, Dalm., and C variolaris, Brong., in part, and 

 added two new species, Crypt. Wcerthii and C. parallelus, 

 to it. In taking the well known Calymene punctata, 

 Dalm., as the typical form for the genus, we gave a short 

 description, reserving the exact diagnosis for the Palaeon- 

 tology of Russia. It is evident to every person who 

 will decide imjiartially and generously with regard to 

 the new limitation of the genus Cryptonyynus, to easily 

 perceive its characters from the given type. The learn- 

 ed Angelin, in his Monograph of Swedish Trilobites, 

 not only recognized my genus, but also gave the generic 

 formula. 



