26 TRANSACTIONS OF THE WAGNER FREE 



asper, as represented in Dr. Burmeister's plate XL., in the Annales del 

 Museo Publico de Buenos Aires, 1870-74. 



A specimen, represented in figure 1 1 , plate V., is a stout cone with 

 the apex bent downward. The base is thick, irregularly circular, rounded 

 and imperfectly defined from the cone by a shallow, irregular groove. 

 Beneath, it is slightly concave, and the sides of the cone are smooth. The 

 greater breadth at base is 42 mm., the smaller 38 mm., and the height 28 

 mm. A second, rather larger specimen is nearly like the former. A smaller 

 specimen with an hexagonal oval base, 39 by 34 mm. in breadth, is 19 mm. 

 high and has the apex to one side, but not abruptly bent as in the former. 



A fourth specimen, smaller than the preceding, has a hexahedral base, 

 and the cone partakes in a measure of the same form. It is 30 mm. in its 

 greater breadth and 20 mm. high. 



Five specimens, most alike, have the form of an oblique cone with the 

 apex to a variable degree on one side. The base is circular or more or less 

 rounded polygonal, slightly concave or flat beneath, and obtusely rounded 

 at the border. It is also more or less defined by an irregular partial groove. 

 In one of the largest specimens, the sides of the cone are most promi- 

 nently convex, and the apex is rather abruptly bent so as to overhang the 

 base. In a second specimen, of greater width in one direction than the 

 former, the apex of the cone is not so prominent and does not overhang 

 the base. In the third specimen, nearly as broad as the first, the cone is 

 much depressed, being about a third lower, is flattened especially on the 

 longer side, and has the apex straight and more blunt. The remaining 

 two specimens, of which one is represented in figs. 2, 3, plate VI., are 

 nearly the same size, but much smaller than the others. They are flattened 

 cones with the apex overhanging the base ; the one being considerably 

 more depressed than the other. The measurements of the specimens are 

 as follows : 



Greatest breadth of base, . . 41 mm. 43 mm. 39 mm. 24 mm. 24 mm. 

 Smallest " " . 37 " 38 " 35 " 22 " 20 " 



Height of cone, . . . 28 " 25 " 19 " 15 " 10 " 



A dermal bone, of much greater breadth than the preceding specimens, 

 has a mammillary eminence most prominent to one side, and defined from 

 the thick, ovoidal, flat base by a continuous groove. Its greater breadth 

 is 57 mm., its smaller one 50 mm., and its height 23 mm. 



A small dermal bone with a hexagonal base has a conical eminence with 

 the apex to one side. Its greatest breadth is 29 mm., the smaller 26 mm., 

 and the height 22 mm. 



Another specimen is a flat, pointed cone with an elliptical convex base. 

 Its greater breadth is 24 mm., its smaller one 1 1 mm., and its height 

 29 mm. 



