440 Trans. Acad. Sci. of St. Louis. 



ornamented with radiating ridges, are present in the Glen 

 Park limestone. In only a few instances are there more than 

 single plates preserved together, but in one specimen five 

 plates are preserved in their natural position. None of the 

 basals are present but there is one radial supporting a costal 

 with an interbrachial on each side. The fifth plate is in the 

 same line with the radial, but is not truncated above for the 

 support of a costal and therefore must be the anal plate. 

 This anal plate, being pointed above for the support of two 

 nterbrachials, indicates the family Actinocrinidae with cer- 

 tainty, and the specimens are referred provisionally to the 

 genus ActinocrinuSy although better material is necessary for 

 a more certain determination. 



Agaricocrinus? sp. undet. 



Plate 2, fig. 4. 



An incomplete crinoid, preserving only an hexagonal base 

 of three equal plates, and four plates of the radial-anal row, 

 is preserved in the collection from Glen Park. The specimen 

 is too incomplete to determine whether the posterior inter- 

 brachial area possesses the characters of the Batocrinidae or 

 of the Actinocrinidae, but the horozontal position of the basal 

 and radial plates present is strongly suggestive of the genus 

 Agaricocrinus and there can be but little doubt of the cor- 

 rectness of this generic identification. 



MOL.L.USCOIDEA. 



BKACHIOPODA. 

 Orthothetes chemunqensis (Con.). 



Plate 1, figs. 5-6. 



One of the common species in the Glen Park fauna is a 

 member of the genus Orthothetes, which is indistinguishable 

 from the common 0. chemungensis of the eastern middle and 

 upper Devonian faunas. The Glen Park specimens are all 

 imperfect, for the most part being broken valves. Their 

 average size is less than that of the eastern representatives of 

 the species, but this fact is in keeping with the general char- 



