ADDITIONAL OBSERVATIONS. 



are not Saurians, but Fishes ; and that both species have 

 also been found in the chalk of Sussex. 



III. 



Galt. The bed of clay bearing this name, and em- 

 braced in the cretaceous deposits of the South of Eng- 

 land, has been detected, by Mr. Conrad, near Erie, Ala- 

 bama. The English gait is characterized by the Inocera- 

 mus sulcatus ; the American stratum also contains a shell 

 of the same genus, but the specimen in my possession is 

 too imperfect for description. The Hamulus onyx is also 

 characteristic of this clay. 



IV. 



During a recent excursion among the arenaceous strata 

 of New Jersey, by Mr. Conrad and myself, we found the 

 Terebratula lachryma, (hitherto observed only in the 

 Upper division,) in the argillo-ferruginous sand at Wood- 

 ward's farm, in Monmouth county. The same locality 

 furnished us with a new species of Plagiostoma. 



Plagiostoma echinatum, (S. G. M.) Shell ovate, very ven- 

 tricose, with a few concentric furrows on the inferior half; 

 ribs numerous, narrow, aculeated above , six or seven of the 

 costse armed with slender oblique elongated spines. 



V. 



The ferruginous sand has lately been traced from Arney- 

 town to Tinton, in Monmouth county, N. J. ; at the latter 



