416 Forty- second Report on the State Museum. 



nurus Nomki, Arethusina, Ampyx, Gardiola interrupta, etc.; (2) that of 

 Orthoceras alticola and other species, Antipleura Bohemica, Phacops with 

 •elongate Dalmanitiform glabella and distinct glabellar furrows; (3) 

 that of Spirifer secans, S. viator, Cheirurus, Cyphaspis; Bhynchonella 

 cuneata. To the lowest Devonian (Hercynian) was referred the upper 

 part of E 3 represented by the zone of Goniatites (Tornoce?*as), G. 

 (Anarcestes) and Gyrtoceras Miles, and the zone of Bhynchonella Megcera, 

 Athyris obolina, Atrypa marginalis, Bhynchonella Sappho (Barr., not Hall). 

 To the younger Lower-Devonian (paralleled with F) is referred a coral 

 limestone with Bhynchonella princeps, B. amalthea Pentamerus procerulus, 

 Spirifer super stes and others, Orthis palliata, etc. (Bohemian species.) 

 G l -G 2 are regarded as intermediary between the Lower and Middle- 

 Devonian, G" 3 as upper Middle-Devonian, with String ocephalus Burtini, 

 Macrocheilus arculatum, Alveolites suborbicularis; while H, as a remnant, 

 is considered as a possible equivalent of the lower and upper Upper- 

 Devonian zones, the former with Bhynchonella pugnus, Productus 

 suhaculeatus, the latter with Clymenias, Goniatites delphinulus and 

 Phacops cryptophthalmus. 



We may well leave to Dr. Frech the onerous task of verifying these 

 extreme views in regard to the subdivision and equivalence of the 

 Bohemian upper Stages, and turn to a brief notice of more recent 

 views in regard to the Hercynian, evincing far greater conservatism, 

 expressed by Prof. Charles Barrois in a work entitled " Faune du 

 Calcaire d'Erbray; Contribution a l'etude du Terrain devonien," 1889.* 



In this elaborate volume is given a thorough presentation of the 

 status of Hercynian discussion and a searching analysis of its merits. 



The hamlet of Erbray, in the commune of the lower Loire, had been 

 made known to geological science, through the announcement by 

 Caillaud, in 1861, that the limestones of this district contained a 

 fauna comparable to that of the third Silurian fauna of Bohemia; the 

 same year Bureau had expressed the opinion that the fauna contained 

 a commingling of Upper-Silurian and Lower-Devonian fossils. Barrois 

 has divided these limestones into (1) the white limestone with 

 Gapulus, (2) blue limestone with Spirifer Davousti. It is with the 

 fauna of these beds that the body of the work is mainly concerned, 

 and its expression, embodied in about 200 species, leaves little to be 

 expected for future workers. 



The salient diagnostic features of this fauna, both positive and 

 negative, are: 1. Trilobites: Phacops (P.fecundus with duplicate pygidial 

 pleurae); Cryphceus ; Proetus (six species, two of which occur in F, 

 one in G); Bronteus GerMei, with the median pygidial rib faintly, if 



* Memoires de la Socie"te geol. du Nord. Tome III. April, 1889. 



