Description of Some Cincinnati Fossils. 



141 



diameter increases to twice the size, or is doubled, in the dis- 

 tance of two inches. Transverse section circular, though 

 toward the body chamber the shell may be depressed and a 

 transverse section slightly elliptical. Septa moderately 

 arched and distant from one-fourth to two-ninths of the diam- 

 eter of the shell. Body chamber unknown. Outer shell 

 rather thick and longitudinally lined. The lines are fine, and 

 increase in number with the enlargement of the shell, by 

 implantation, and they are disposed to a fascicular arrange- 

 ment that gives the shell the appearance of being longitu- 

 dinally furrowed. Siphuncle eccentric, a little nearer the 

 center than the margin, round and small where it pierces the 

 septa, and only moderately expanding within the chambers. 



This species is only known from the lower part of the 

 Hudson River Group, where it is found associated with 

 Orthoceras iransversum , though it is a much rarer shell. The 

 specimens illustrated are from the collection of the author. 

 The specific name is in honor of August Albers, who made 

 the drawing and is a well-known and active collector. 



Sphenouum cuneiforme S. A Miller. 



Plate S, Fig. 5\ part of the right valve of the shell; Fig. 6, 

 the beak and part of the hinge line showing the ligamental 

 furrow. 



More than twenty years ago the author found a very com- 

 plete and perfect cast of this species. After the lapse of 

 about ten years, no other specimens having been found by 

 any one, he concluded to call general attention to it, by giving 

 it a specific name. He was not willing to found a genus on 

 a single cast, especially when it seemed to be related, in some 

 respects, to a defined genus, and, therefore, he called it 

 Orthodesma cuneiforme . Nearly ten years more transpired, 

 when Mr. Faber having found casts belonging to two distinct 

 species in the same genus, the author felt justified in propos- 

 ing a generic name, and, accordingly, in 1889, he founded the 

 genus Sphcnolnini , with Sphenolium cuneiforme as the type. 

 This history is related for the purpose of showing how rare 



