Rhineastes RHJ3AS. Sp. nov. 



Represented by a median abdominal vertebra, with which is associated a second, as 

 belonging to the same genus and perhaps species. 



The centrum of the former is nearly entire. Its articular faces are a little deeper than 

 wide, and are marked with smooth concentric striae. No notochordal foramen. Centrum 

 not flattened below, and furnished with a single median fossa. Neural canal with a 

 longitudinal fossa on each side. Two large fossae on each side between the bases of the 

 neurapophysis and diapophysis. No fossae on the side of the centrum except a small one 

 below and at the base of the diapophysis. The exposed edges of the vertical laminae are 

 close together at the middle of the side of the centrum, and they turn forwards below, 

 converging to a point on each side of the inferior fossa. They are less numerous just 

 below the fossa below the diapophysis, and are connected by longitudinal bars. The 

 bases of the diapophyses (all that remains of them) are hollow. 



Measurements. 



Mm. 

 f Anteroposterior 12 



Diameters of centrum ] Vertical 31 



I 



L Transverse 29 



The second centrum is fragmentary and may represent another species. It differs in 

 the presence of a very large fossa immediately below the diapophysis, and in the presence 

 of one very large one above the diapophysis. The concentric lines of the articular faces 

 are more prominent. Size similar. 



AMIUEUS, Eaf. 



Two species have left vertebrae in the formation of the Cypress Hills, which resemble 

 those of this genus of Siluroids, which still inhabits North America. That they belong 

 to it cannot be positively asserted, since important diagnostic parts of the skeleton are 

 unknown. Neurapophyses coossified ; lamination longitudinal ; base of diapophyses 

 hollow. 



Amitjrtjs cancellattjs. Sp. nov. 



Two vertebral centra represent this species — one from the median dorsal region, and 

 the other probably from the caudal. 



The first-mentioned and best-preserved centrum has sub-round articular faces, a little 

 flattened above and below, and is without foramen cor dee-dor salis. The floor of the neural 

 canal and of the space between the neurapophyses and the diapophyses are excavated, and 

 the floor of both spaces is composed of longitudinal laminae, which separate rather coarse 

 and deep fossae, the whole resembling cancellous tissue. Inferior median line with a 

 principal median fossa. Dense tissue of the articular faces, reverted on the sides of the 

 centrum. The space between them with minute longitudinal pores These become coarser 

 and more cancellous as we approach the base of the diapophysis, where a larger cavity, 

 more or less divided by caneellae, is placed. Concentric layers of articular faces with 

 distinct edges, producing a slight rugosity. 



