316 MEMOIRS OF THE CARNEGIE MUSEUM. 



of excellence of preservation, one of these hypotypes, that catalogued as No. 5305, 

 is unsurpassed by any fossil fish from this locality which has thus far been brought 

 to light. The following pages are supplementary to Part I of the Catalog of Fossil 

 Fishes from Monte Bolca in the Carnegie Museum. 



Subclass ELASMOBRANCHII. 



Family Trygonid^. 



1. Trygon muricata (Volta). 



(Plate XLIII). 



1796. Raja muricata G. S. Volta, Ittiolit. Beronese, p. 37, pi. ix, figs. 1, 2. 

 1818. Trygonohatis vulgaris H. D. de Blainville, Nouv. Diet. d'Hist. Nat., xxvii, 



p. 336. 

 1835. Trygon gazzolce L. Agassiz, Neues Jahrb., p. 247. 

 1843. Trygon gazzolce L. Agassiz, Poiss. Foss., Vol. Ill, p. 382. 

 1862. Alcxandrinum sp. R. Molin, Sitzungsber. Akad. Wiss. Wien, Vol. XLII, p. 



579. 

 1874. Alexandrinum molinii A. de Zigno, Mem. R. Istit. Veneto, Vol. XVIII, p. 289, 



PL XII. 

 1874. Trygon gazzolce A. de Zigno, I. c, p. 180. 

 1894. Trygon {Tceniura) muricata 0. Jaekel, " Die eocanen Selachier vom Monte 



Bolca," p. 142, pi. iv, fig. 32. 



1904. Trygon muricatus C. R. Eastman, Bull. Mus. Comp. ZooL, Vol. XLVI, p. 23. 



1905. Trygon muricatus C. R. Eastman, Mem. Soc. Geol. France, Vol. XIII, No. 34, 



p. 8. 

 1911. Trygon muricata C. R. Eastman, Mem. Carnegie Mus., Vol. IV, No. 7, p. 352. 



Type. — Nearly complete skeleton; Paris Museum of Natural History. 



Two well-preserved examples of this species are figured by Jaekel in his mono- 

 graph on Eocene Selachians from Monte Bolca, one of which had previously been 

 made the type of a separate genus and sjDecies, the so-called Alexandrinum molini 

 of Baron A. de Zigno. The second of Jaekel's originals was erroneousl}^ stated by 

 that author to have been the identical specimen which is shown in Plate IX, Fig. 1, 

 of Volta's work. In point of fact, however, Volta's type-specimens are preserved 

 in the Paris Museum of Natural History, and were there studied by the present 

 writer some ten years ago. 



The sole character by which the genus Alexandrinum is said to be distinguished 



