34 



Found in the Burlington Group, at Burlington, Iowa, and now in 

 the collection of A. Albers, in whose honor we have proposed the 

 specific name. 



STEG ANOCRIN US GRIFFITHI, n. sp. 



Plaie II, Fig. 17, azygous side; Fig. 18, opposite view; Fig, 19, 

 basal view; Fig. 20, summit view. 



Species small. Calyx obpyramidal, broadly truncated, pentagonal 

 as seen from above or below. Plates nodose, pyramidal. 



Basals form a short, hexagonal cup, deeply notched at the sutures. 

 First primary radials large, nodose, pyramidal, wider than long, three 

 hexagonal, two heptagonal. Second primary radials about half as 

 large as the first, wider than long, hexagonal. Third primary radials 

 smaller than the second, pentagonal, axillary, and beyond these plates 

 our specimen is not preserved. Ten ambulacra! openings penetrate 

 the vault. 



The interradial areas all graduate up into the vault and over the 

 ambulacral channels so as to leave no dividing line between the vault 

 and calyx. The first regular interradial is followed by two plates 

 that unite with two plates that belong to the vault and two that cover 

 part of the ambulacral canals. In the azygous area, the first plate is 

 in line with the first primary radials, but somewhat smaller. It is 

 followed by two plates in the second range and three in the third that 

 unite with the plates of the vault and those covering part of the 

 ambulacral channels. 



The vault is only slightly convex and bears a central proboscis. 

 It is covered with rather large convex plates. 



This species most resembles S. sharonensis, from which it is dis- 

 tinguished by the character of the ornamentation, by the form of the 

 basal plates, and by having a less number of plates in the interradial 

 areas and upon the vault. The vaults are so different that the two 

 species will not be taken for each other. 



Found in the Burlington Group, at Burlington. Iowa, by Dr. H. 

 G. Griffith, formerly of that place, but now residing in Philadelphia. 

 We take pleasure in dedicating this species to the learned doctor and 

 naturalist who discovered it. It is now in the collection of Mr. A. 

 Albers. 



