Cambrian Faunas. 261 



fauna appears. Thus the only Cambrian fauna which this 

 region shows is that of the Acadian sub-section, Div. 1 c. 2. 



This also is the case in the north of Spain, whence Bar- 

 rande and DeVerneuil described a priraordeal fauna in 1860 

 of the following genera: Parodoxides, Conocephalites [in- 

 cluding the genera Ptychoparia, Conocoryphe and Ctenou- 

 phalus] Arionellus [Agraulos], Orthisini [Protorthis, Hall], 

 Orthis, Capulus [Parmophorella], Discina and Trochocys- 

 tites ; an assemblage referable to the Acadian Division lc* 



An older fauna than those of France and Spain described 

 above, or, at least, one having types that are more archaic, 

 is that described by Professor G. Meneghini, from the 

 Cambrian beds of Sardinia. 1 



This writer has published a memoir on the Cambrian 

 trilobites of Iglesiente in that island which shows that there 

 are there some novel and peculiar types of trilobites. 



The writer of the memoir on these trilobites recognizes 

 .two horizons or zones in the Cambrian rocks of this island, 

 each containing its special types. The lower of these he 

 compared to the Menevian group and the Lingula Flags of 

 Britain, and the upper to the Tremadoc slates. 



The fauna of the lower horizon is of great interest, partly 

 as combining two faunal facies which are distinct elsewhere, 

 and partly on account of two peculiar types of trilobites 

 which existed there. The most notable of these types is 

 that of the Oleni figured and described in this work. These 

 are remarkable for their stout rachides and for their general 

 olenelloid aspect. They differ from the Oleni of the north 

 of Europe in the fact that their eyes are placed opposite 

 the glabella instead of being nearly in front of that part, 

 as is the case with all the northern forms; and the eyelobes 

 also are unusually long. In one species (0. Zoppii) the 

 eyelobes are decidedly drawn in at the posterior end, espe- 

 cially in the young individuals." Now, if we follow the 



1 Palfeontologia dell' Iglesiente in Sardegna, Fauna eambriana 

 trilobiti, memoria del Prof. Guiseppe Meneghini, Firenze 1888. 



2 See Tav. L, fig. 10, and for a more mature individual Tav. III., 

 fig. 13. 



