26 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



sind nur die beiden Brustflossen deutlich." A little further on, however, lie 

 says : " Die erste Eiickenflosse ist auch bei dem Pariser Exemplar an dersel- 

 ben Stelle angedeuiet, wo sie bei dem hier abgebildeten sitzt, namlich iin- 

 iiiittelbar tiber dem Hinterrand der Brustflossen. Auch die zweite Dorsalis 

 und die Analis scheinen bei dem Pariser Stiick an der gleichen Korperstelle, 

 wie an dem Paduaner, iibereinander zu stehen. . . . Ueber die Form der 

 Schuppen und sonstigen Einzelheiten konnte ich leider an dem Pariser Stiick 

 keine zuverlassige Beobachtung anstellen " (p. 174). 



The present writer has not been able to verity the above description in all 

 particulars, but on the other hand has found it possible to observe some details 

 not previously made known. 



The specimen, by the way, is preserved on a single slab, and the catalogue 

 of the Museum does not show that it ever existed in counterpart, although the 

 contrary is affirmed by Jaekel. The anterior third of the trunk lies squarely 

 on its back in the matrix, the first dorsal fin being thus wholly or for the 



\. 



Fig. ^1. Type-specimen of Carcharias (Scoliodon) cuvieri (Ag.). X ^^- Extremi- 

 ties of the dorsal and caudal fins hypothetically restored. 



most part concealed. The remainder of the trunk is visible from the lateral 

 a.spect, and the fins which it exhibits are the posterior dorsal, anal, and a 

 portion of the lower lobe of the caudal, as indicated in the accompanying 

 Figure A. A small triangular mass of scales lying immediately in front of the 

 posterior dorsal may perhaps be interpreted as a ruptured portion of the 

 shagreen, or possibly even as the displaced tip of the anterior dorsal. 



The shagreen is very excellently preserved over various portions of the body, 

 the form and structure of the individual scales appearing as distinct as in life. 

 The shagreen granules agree so perfectly with those of the recent Scoliodon 

 that no further description is necessary, and the same is true of the dentition. 

 A number of the teeth are preserv^ed in their natural position in the mouth 

 region, and all exhibit very clearly the inclined triangular crown with smooth 

 edges characteristic of Scoliodon. It will be seen that the identification which 

 is here made of this shark as a species of Scoliodon is in accordance with all 

 the characters, except that the rostrum appears to have been rather less pro- 

 longed. In the above text-figure, the posterior dorsal and caudal fins have 

 been hypothetically restored. 



