394, publishes a description of the then known trilo- 

 bites. He uses trilohus, Walch's designation, in an 

 abbreviated form, and classes the whole family under 

 this name. He was the first author giving specific 

 names to the different species, and calls our present 

 species, C pxinctatus, from its series of perforated tu- 

 bercles, Tribolns punctatus 



In 1820, Schlotheim (Palteontology in its Present 

 State, Gotha, 8vo., p. 34, No. 3) published a descrip- 

 tion of five different species, two of which, however, 

 belong to doubtful forms. His No. 3 is designated Tri' 

 lobites variolatiis. 



Parkinson, in his " Organic Remains of a Former 

 World," on p. 266, vol. iii, gives the following descrip- 

 tion of the species quoted by Brongniart, for the type 

 of his Cali/mene variolaris : " The representation of a 

 mutilated fragment of which is given plate 17, fig. 16, 

 is a very extraordinary fossil. In this animal, the lobu- 

 lar divisions seem to have very nearly corresponded 

 with those of the Dudley species {Calyviene Blumen- 

 bachii). But the structure of the head part of the 

 animal differs exceedingly from every other species. 

 In this fossil, instead of the appearance of the distinct 

 parts of a face, there are three large round protuber- 

 ances, the middle being the largest ; and all the other 

 protuberances are closely beset with small tubercular ris- 

 ings, * * * tije eyes being placed in the centre 

 of each lateral rising." 



In 1821, Wahlenburg published, in the Nova Acta 

 Reg. Scieut., vol. viii, his Petrificata Telluris Suecanse. 

 He describes 14 species under the general generic name 



