GEOLOGICAL SOCIETY OF PENNSYLVANIA. 349 



Mr J. p. Wetherill joined me in the determination of 

 investigating the new locality of this highly interesting 

 fossil animal. We accordingly communicated our de- 

 sign to the Hon. Mr Creagh, requesting that he would 

 use every exertion to procure us during the winter sea- 

 son a collection of these curious remains; noticing, at the 

 same time, that the jaw, the teeth and long bones were 

 more peculiarly desirable. Mr C. in the most liberal 

 manner honoured our request in paying immediate atten- 

 tion to our demands, and this with the sole purpose of 

 contributing to the advancement of science — the different 

 parties being strangers to each other. We take this 

 opportunity of ofFering that gentleman, in the name of 

 all votaries of science, our warmest thanks. 



The box received on this occasion contained the fol- 

 lowing named specimens : viz. A portion of the upper 

 jaw of the right side, with several teeth, more or less 

 perfect, all nearly buried in the matrix of limestone 

 with which the bones are intimately incorporated (the 

 rock is of a dull white colour, the bones of a brownish 

 cast tinged with reddish) ; an os humeri, fractured 

 transversely near the distal extremity, but in other re- 

 spects nearly perfect (this bone is of a greyish-black 

 colour) ; several immense vertebrsB, with three or four 

 of much smaller dimensions, and of different proportions; 

 one isolated molar tooth, which was with difficulty sepa- 

 rated from the mass; numerous pieces of ribs, both 

 true and false; the inferior extremity of a tibia, and 

 some fragments of solid bones, apparently portions of the 

 shoulder and pelvis. From a similar rock in the vicinity 

 of the bones were also obtained and forwarded, casts of 

 a Nautilus, of a species peculiar to this formation (N. 

 Alabaraensis, Morton); a new species of Scutella (S. Ro- 

 gersi, M. ) ; and also the cast of a Modiolus, of a nonde- 

 script species, described and figured by Mr Conrad in 



