158 FOSSIL CRINOIDS. 



Cyathocrinus type, the opening being apparently at the end, as in that genus, 

 and its plates alternating instead of being in longitudinal rows. It is composed 

 of numerous hexagonal plates, which are perforated by pores at the middle of the 

 sides penetrating to the interior, as I illustrated by a number of detailed figures 

 in a paper on pores in the ventral sac in fistulate Crinoids (Amer. Geologist, Sept., 

 1900, 134-151, PI. VII), from specimens of this species under the above name. 

 Mr. Bather, commenting on that paper in the November number of the American 

 Geologist for the same year, p. 307, said: "As for the single representative of 

 Parisocrinus, referred to P. subramosus M. and G., I must confess that I am 

 quite unacquainted with any such species, and that I am unable to find the 

 specific name under any Inadunate genus in the published writings of Miller 

 & Gurley, including Miller's " N. American Geology & Palaeontology" with its 

 appendices." I have pleasure, even at this late day, in supplying him with 

 the references to the literature above cited, where he will find the species, under 

 the Inadunate genus Poteriocrinus, described and figured in two different publi- 

 cations of Miller and Gurley in 1890, and listed a third time in 1892 in the 

 first Appendix to Miller's North American Geology and Palaeontology. 



The species is from the Keokuk Group at Crawfordsville, Indiana, where 

 it is not uncommon; and Miller and Gurley's P. circumtextus was described 

 from an average specimen of it. The specimen figured was found by Mr. Fred- 

 erick Braun, who has kindly placed it in my hands for investigation. 



MARSUPITIDAE. 



Marsupites J. S. Miller, ex Mantell Ms. 



1821. Nat. Hist. Crinoidea, 134. 



I am now able to make another important addition to the Mesozoic crinoidal 

 fauna of this continent, in the shape of a species of this well known genus. In 

 Europe, both in England and on the continent, it has been found in many places 

 in the Chalk of the Upper Cretaceous, associated with plates of Uintacrinus, 

 this fact having been reported frequently in recent years by Bather, Rowe, 

 and others. The most careful search in the Niobrara beds of the American 

 Cretaceous, where Uintacrinus is found over a considerable territory, has failed 

 to disclose a trace of Marsupites in that formation. The material now in hand 

 was found by Mr. Frederick Braun in the Tombigbee Sandstone of the Upper 

 Cretaceous in northern Mississippi; it consists of one good calyx with a small 



