ing description is evidently of Orypt. punctatus : " The 

 glabella seems divided into three- hemispherical masses, 

 the middle one being the largest. * * * The sides 

 of the head exhibit at their angles an appendage which 

 is prolonged on the sides of the thorax to the 6th seg- 

 ment (5th). These parts are covered wftli' small grains 

 or tubercles, very numerous and more salient than in the 

 preceding species (C. Tristani). They are provided at 

 their summit with a small puncture, like the tubercles 

 of the EcMnoderms of the genus Cldaris." 



Eichwald, in his Obser. Geognostico-Zoologicae per 

 Ingriam Marisque Baltici, 1825, describes 8 specimena 

 of trilobites, under his generic denomination, Cryjito- 

 nymus. Three of these fossils are now referred as 

 synonyms to Asaphns expansus ; and the others to the 

 genus Illcenus, established by Dalman, in 1826. Eich- 

 wald has claimed the priority of the genus Cryptony- 

 vius over Dalman's genus, but abandons his claim in 

 1840, and substitutes his generic name, Cryplonymus, 

 with the Calymene punctata, Dal., as its type for a new 

 genus. 



In the year 1826, Dalman published his essay upon 

 the Palseaden, which appeared- in the Kongliga Svenska 

 vet. Akademien, 1826, p. 226-293, and the German 

 edition, 1828. On p. 40, No. 6, the Calymene punctata 

 is described, and represented on plate 2, fig. 2, as a py_ 

 gidium, with 10 thorax segments; and fig. 2 b. repre- 

 sents the same part, w^ith 6 tubercles on the axis, and 7 

 pleurae. 



In 1830, Eichwald, in his Zoologia Specialis, pars. 2, 

 p. 115, advocates his claim of priority for the genus 

 Crypionymus over Dalman's genus, Illcenus. 



