1885.] ±tJ [Cope. 



Measurements of Vertebra,. 

 No. 2 (without ribs). M. 



Width of centrum posteriorly 0040 



' ' at diapophyses inclusive 0180 



" " postzygapophyses 0100 



No. 3 (without rib). 



f longitudinal 0072 



Diameters centrum \ vertical anteriorly 0035 



(.transverse anteriorly 0035 



Width at diapophyses inclusive 0170 



' ' of postzygapophyses , . .0094 



No. 3 ; posterior caudal. 



Length centrum 0070 



Width at middle 0035 



■r.. *•<•♦/ vertical 0040 



Diameters centrum in front < nnAn 



( transverse 0040 



Elevation to postzygapophysis 0065 



Width of neural spine at postzygapophysis 00G5 



This species was probably of elongate form. Prof. Derby informs me 

 that he has seen considerable series of consecutive vertebrae. The speci- 

 mens sent me indicate that the size of the body is about equal to that of 

 the fully grown Tejus lizards now inhabiting Brazil. 



The specimens are from four localities in the province of Sao Paolo ; 

 viz : Rio Claro, Limeria, Itapetininga and Tiete. These localities are a 

 considerable distance apart, and represent the considerable extent of the 

 formation from which the bones have been procured. As a Lepidoden- 

 dron and a Schizodus have been obtained from the same beds, they are 

 probably of Carboniferous or Permian age. 



The specimen preserved on the slab belongs to the private collection of 

 Madam Ribeira de Andrada, to whom science owes a debt of thanks for the 

 opportunity of determining its characters which she has given by lend- 

 ing it to the Museo Nacional. 



REPTILIA. 



Hypos aurxjs derbianus, sp. nov. 



The genus Hyposaurus has been hitherto represented by but one well 

 known species, the H. rodgersi Owen, of the green sand of Cretaceous 

 No. 5, of New Jersey. Specimens in my possession demonstrate that 

 the genus Hyposaurus belongs to the Teleosauridse, and that its nearest 

 ally is the Steneosaurus of St. Hilaire. It differs from Metriorhynchus 

 Meyer, in the presence of distinct lachrymal bones, and in the relatively 

 small size of the prefontals. From Teleosaurus proper it differs in the 

 robust size and vertical directions of the teeth. The orbits are vertical, and 

 the sagittal region is a keel. In the H. rodgersi the frontal bone is nar- 

 rower than in any of the species of Teleosauridse figured or described by 



