STUDY OF THE GRAPTOLITES. 275 



Note on the Genus Ptilograptus, Hall. — Since the publication of the 

 Canadian Decade, I have seen the work of Gceppert, " Ueber Die Fossile 

 Flora der Silxirischen, der Devonischen und Unteren Koltlen Formation, 1859." 

 The Oallithamnion, or Oallithamnites reussiamis, figured on plate xxxvi, from 

 the Upper Silurian of Bohemia, is so similar to the Ptilograjytus genitzianus of 

 Plate xxi, Canadian Decade (Plate iv of this paper), that I cannot doubt the 

 generic identity. Whatever may be the relations of the European species, 

 the Canadian one is not a plant, if we may judge from its horny carbonaceus 

 textui'e. 



In a paper on " Fucoides in the Coal Formation"* by M. Lesqueredx, the 

 author has stated his opinion that the "peculiar Fucoides serra" described b}' 

 Beongniart in his Vegetaux Fossiles, page 71, tab. 6, figs. 7 and 8, should be 

 placed im der the Genus Caulerpites of Sternberg, into which he proposes 

 to admit all the forms described by Prof. Hall under the name of Spirophgton, 

 Regarding, the latter, I have, in this place, nothing to say; but the Fucoides 

 serra of Brongniart is no doubt a species of Graptolite, and the locality whence 

 cited. '' Pointe Levi pres Quebec" has atforded many species of Graptolitid^e, 

 but no recognizable species of Fucoides. In the ^'-Figures and Descriptions 

 of Canadian Organic Remains" Decade ii, page 84, I have given mj' reasons 

 for believing that the Fucoides serra of Brongniart is identical with Grapto- 

 litJms hryonoides of Hall (Plate iv, figs. 1-11, and Plate iii, figs. 11 and 12 ( ?) 

 of Decade, and Plate iii, figs. 16 and 17 of this paper), the identity not having 

 been discovered till long after the publication of the last named species. 

 The Fucoides dentatus of Brongniart, from the same locality, is likewise with- 

 out doubt a graptolite, and probably identical with that described by me as 

 G. {Diplograptus) prisiiniformis. I have no doubt that if M. Lesquereux 

 were to examine th^se and other Lower Silurian fossils of generally similar 

 character, he would arrive at the same conclusions as myself regarding their 

 nature and relations. 



* 071 Fucoides in the Coal Formation [with a Plate]. By Leo Lbsqueeeux. Read before 

 the American Philosophical Society, May 18th, 1866. 



