32 



"Some of the species, such as S. perumbrosus, have but a 

 very small simple opening situated subcentrally, or more or 

 less excentrically toward the anal side, and penetrating the 

 flattened vault obliquely, so as to be directed forward or away 

 from the anal side; while others, like 8. liraius, have a long 

 erect, subcentral tube, or so-called proboscis, sometimes re- 

 curved at the end." 



Wachsmuth & Springer proposed to divide this genus and 

 make S. liraius the type of a new genus which they called 

 Tcleiocrinus, which differs from S. perumbrosus, in no other 

 respect, than that pointed out above by Meek & Worthen. In 

 other words the genus Teleiocrinus is to be distinguished from 

 Slroiocrinus, upon the elevation of the azygous opening. If 

 the opening is at the top of the vault it is Strotocrinus, but if 

 it is elevated the height of a plate it is Teleiccrimis; and so if 

 it is elevated one- fourth of an inch or half an inch, or an inch 

 or more it is still Teleiocrinus. This method of nomenclature 

 we do not approve. We have shown, elsewhere, that the pres- 

 ence or absence or form of a proboscis, in Batocrinus, is not 

 of generic importance and the same is true throughout the 

 Actinocrinidw. The genera must be distinguished by the calyx. 

 Therefore, after having given the subject our best considera- 

 tion, we conclude that Teleiocrinus must be regarded as a syn- 

 onym for Slroiocrinus. 



The species here under consideration is a Strotocrinus, as the 

 genus was defined by Meek & Worthen, and the simple fact 

 that it has a small proboscis will not take it out of that genus. 

 It is the only species thus far defined having twenty-six arms 

 and will be readily distinguished from all others by the arm 

 formula and interradial areas. 



Found in the Burlington Group, near Burlington, Iowa, and 

 now in the collection of S. A. Miller. 



ACTINOCRINUS JESSIES, n. sp. 



Plate II, Fig. 15, azygous side; Fig. 16, opposite view. 



Species large. Calyx obconoidal, regularly expanding from 

 the column, about one-fourth wider than high. Surface beau- 

 tifully sculptured so as to make each plate more or less 

 obpyramidal from a central node. No radial ridges. Column 

 not large. 



Basals form an expanding cup, they project a little below 

 the point of columnar attachment with the margins notched so 

 as to form a trilobed base, which is concave for the attach- 



