EASTMAN: CATALOG OF FOSSIL FISHES IN CARNEGIE MUSEUM. 353 



fort justement M. Wagner, de faire disparaitre les lacunes, les doutes, et les in- 

 exactitudes que le celebre naturaliste de Neufchatel a ete force de laisser dans ses 

 Recherches, relativement aux especes des schistes lithographiques de la Baviere."^ 



Fortunately for the science of paleichthyology the lacunse in our knowledge 

 of the Kimmeridgian fish-fauna of Bavaria, of which writers of half a century ago 

 complained, have been in large measure filled by the unremitting researches of a 

 long procession of students. Deficiencies still exist, however, in the extent and 

 thoroughness of our knowledge of the contemporary ichthyic fauna of southeastern 

 France. The quarries of lithographic stone in this region are relatively little worked 

 and in some localities have been abandoned; the supply of materials is at best 

 scanty; and the region is less easily accessible than the level plateau country of the 

 Alb in northern Bavaria. 



For these and various other reasons comparatively few investigators have 

 been in later years attracted to the study of the Cerin fauna. The list is, indeed, 

 exhausted when we have mentioned the names of A. Wagner and Karl A. von 

 Zittel of Munich, and Professor Albert Gaudry of Paris, all deceased, and H. E. 

 Sauvage of Boulogne-sur-Mer, and Dr. A. Smith Woodward of London. Through 

 exchange with the Lyons Museum of Natural History in 1873, a number of well- 

 preserved specimens from Cerin were received by the Museum of Comparative 

 Zoology at Cambridge, Massachusetts. This material has been studied in con- 

 nection with that belonging to the Carnegie Institute in Pittsburgh, and a portion 

 of the results is incorporated in the present modest contribution. 



After the above general statements we proceed to the description of the dif- 

 ferent genera and species from Cerin represented in the collection of the Carnegie 

 Museum. As in the preceding parts of the Catalog, the systematic arrangement 

 of families and genera follows closely that laid down in Dr. A. Smith Woodward's 

 " Catalogue of Fossil Fishes," and the chief diagnostic characters have been almost 

 entirely extracted from the same source. 



CLASS PISCES. 



Subclass I. ELASMOBRANCHIL 



Order PLAGIOSTOMI. 



" Head prolonged in front of the ventrally-situated mouth as a more or less 



prominent pre-oral rostrum; vertebral column consisting of alternating basi- 



and inter-dorsal cartilages, generally supported by more or less well developed 



chorda-centra. Pectoral and pelvic fins uniserial. Pelvic girdle and claspers 



6 Memoir of 1854, p. 6. 



