374 The American Geologist. June, isoo 
The majority and most conspicuous of those fossils are trilo- 
bites to the number of 27 species : 12 Paradoxides, 4 Cono- 
cephalites, 2 Hydrocephcdiis, 2 Ellipsoccplialus, 1 Arionelhis, 1 Sao 
and 5 Agnostus. Besides, Barrande quotes 5 Hyolites, a Theca. 
a Discina, one Orthis, 4 Trocliocystiies a.nd three undetermined 
forms. The prevalence oi Paradoxides led Barrande to give to that 
genus an importance of the first order in classifying the lower 
Paleozoic strata ; and since his numerous publications on the 
primordial fauna and more especially his splendid and most 
valuable work "Le systeme Silurien du basin de la Boh6me" 
all the trilobites having Paradoxidean forms and consequently 
allied more or less closely to Paradoxides, have justly been 
regarded as the guide ; all the strata containing them, are re- 
ferred to the Taconic system or great primordial zones. 
Sweden. — In this paper, we have given already the classi- 
fication of Linnarsson of 1876, for the Paradoxides beds 
of Sweden, divided into five groups, the upper one being char- 
acterized by Agnostus Isevigatus and the four others being char- 
acterized by Farad, forchammeri, Parad. celandicus, Parad. da- 
vidis and Parad. tessini. More recently, 1884, Messrs. Tullberg 
and Nathorst iti "Annexe explicative a la carte geologique le la 
Suede," p. 21, Stockholm, give more details, and they have 
classified for Scania the "Schistes a Paradoxides" or "H. Etage 
inferieur" of the primordial fauna system into : 
a. Beds with Agnostus lavigatus. 
b. id id Paradoxides forchhammeri. 
c. id id Agnostus lundgreni. 
d. id id Paradoxides davidis. 
e. id id Conocoryplie sequalis. 
f . id id Agnostus rex. 
g. id id id intermedius. 
h. id id Microdiscus scanicus. 
i. id id Conocoryplie exsulans. 
k, id id Agnostus atavus. 
1. Breccia limestone. 
m. Black aluniferous slates. 
The last division n belongs to the Holmia hjendfi zone or 
Scandinavian formation. According to Linnarsson, the Bohe- 
mian formation or Paradoxides zone of Sweden, contains six 
species of Paradoxides,EllijJsocephalus muticus, three Arionellus, 
three Anomocare, three Liostracus. Delichometopus suecicus 
three Conocoryjihe, four Solenopleura and twelve Agnostus ; 3 
Hyolithus, 3 Orthis, 2 Lingulella, Obolus, Obolella, Acrotreta, 
