180 



KADIATA. 



No. 947. Periechocrinus moniliformis, Miller. 



Body, arms and stem. This beautiful Actinocrinoid is from the Upper 

 Silurian of Dudley, England, and now in the private Geological Cabinet of Mr. 

 Ward, Rochester. Size, 9x8. Price, $1.50. 



No. 948. Periechocrinus moniliformis, Miller. 



Body, arms and stem ; same locality and Museum. Size, 9x7. Price, $1.50. 



No. 949. Pentremites piriformis, Say. 



Body and column. This Blastoid has a body composed of polygonal plates, 

 divided by five perforated grooves ; a short column, formed of cylindrical, perfo- 

 rated ossicles with radiated siirfaces ; and irregular side-arms. From the Ches- 

 ter limestone (Carboniferous), Pope Co., 111. Price, $0.20. 



No. 950. Pentremites pyriformis, Say. 



From the Chester limestone (Carboniferous), Sequatchie Valley, Tenn. 



Price, $0.20. 

 No. 951. Pentremites cervinus, Hall. 



From the Chester limestone (Carboniferous), Chester, 111. Price, $0.15. 



No. 852, Platycrinus regalis, Hall. 



The typical Platycrinus have three basal plates, and sometimes terminate 

 upwards in a long proboscis. This head, with branching arms, is from the 

 Burlington limestone (Carboniferous), Burlington, Iowa. Price, $0.40. 



No. 953. Platycrinus Sarae, Hall. 



Body, arms and stem. From the St. Louis 

 limestone (Carboniferous), St. Louis, Mo. 



Price, $0.50. 



No. 954. Pteroconia pinnata, Agass. 



This beautiful Crinoid (the Comatula pinnata of Goldfuss) is a fossil of very 

 frequent occurrence in the fine limestone strata left by the ancient Solenhofen 

 sea. It had no stem, but the younger specimens show certain faint traces of 

 rootlets which perhaps anchored them in their early age. The body, or central 

 disc, is almost nul, and absorbed, as it were, by the great development of the arms. 

 These arms, of which there are usually ten, are very long and slender, and are 

 bordered on either side by radiating, thread-like, side-arms or tentaculae which 

 span the intervening space with a delicate fringe. The majority of the individ- 

 uals found are much distorted, and their arms tangled and broken by the action 

 of the waves before they were buried in the mud. From the Lithograjmic Lime- 

 stone (Middle Oolite) of Solenhofen, Bavaria, and now in the Ward Museum of 

 the University of Rochester. Size, 9 x 6. Price, $1.25. 



