280 



By its supra-marginal periproct this new Scutellina is related 

 to S. supera, Agassiz; but its circular outline and high summit 

 distinguish it ; it is, moreover, very much larger 



Eehinobrissus Vineentinus, -ipec. 7wv. 



Subconvex ; ambitus ovate-subpentagonal, anteriorly rounded, 

 sides arched to near the posterior border, which is roundly bian- 

 gulated ; base longitudinally concave, tumid mediolaterally. The 

 anal sulcus is moderately deep, wide, rounded behind, and extends 

 to more than half or nearly two-thirds the length of the post- 

 apical radius. The apical disc is at about three-fifths of the long 

 diameter from the front. The greatest width is in a plane intersect- 

 ing the anal sulcus at its middle. The tuberculation is rather 

 large, and largest on the actinal surface. There are no pores 

 below the subpetaloid parts of the ambulacra, but pores in a 

 single series occupy the ambulacra converging on the peristone. 



Dimensions. — liOngitudinal, 28*5 ; transverse, 23' ; sectional 

 diameters, 12* mm. 



Localities. - Common in the glauconitic limestones, Aldinga 

 Bay ; also at Muloowurtie, near Ardrossan, York-Peninsula. 



This species has the same general outline of E. Morrisi^ 

 Forbes, but is more depressed and has a very much wider sulcus, 

 not narrow and acute behind. Another Cretaceous species which 

 comes near to it, is E. lacunosus, Goldfuss, Petref. Germ., p. 141, 

 t. 73, fig. 8, but it is more narrowed at the front, more angulated 

 behind, the anal sulcus is much longer, and the apical system is 

 more excentric. E. Australice, Duncan, has an elliptical outline. 



Cardiaster lateeordatus, .spec. nor. 



Test orbicular-cordate, as seen from above, with a deep and wide 

 anterior groove, which is tumidly keeled at its sides, and extends 

 from the vertex to the peristome ; the base is slightly concave 

 longitudinally, and fiattened laterally; the ambitus is slightly 

 tumid, and the abactinal surface is depressedly convex. 



The apical system is excentric, and is a little posterior to the 

 vertex. 



From the vertex the surface slopes rapidly in all directions, 

 most so to the posterior margin, which is slightly rostrated trun- 

 cate ; the posterior face is wide, but short, and is slightly concave 

 vertically. The j^osterior slope is interrupted by a faint keel; 

 and the anterior by the tumid keels bordering the anterior groove, 

 transverse to which the anterior lateral areas are slightly concave. 

 The anterior groove is very wide, but contracts a little at the 

 ambitus, where it is deepest. 



The ambulacra are flush, the anterior ambulacra slightly 

 arched, are more prominent, tlie poriferous zones in each of the 

 posterior ambulacra diverging more rapidly than those of the 



