CRINOIDEA. 



145 



No. 441. Batocrinus rotundus, Y. and S. 



Burlington Limestone, Bur]in<?ton, Iowa. 



No. 442. Dorycrinus unicornis, O. and S. 

 Burlington Limestone, Burlington, Iowa. 



No. 443. [911, Cast]. Crotalocrinus rugosus, Miller. 



Body, stem and root, on pedestal. .This ancient Crinoid is so called 

 from its peculiar shape and structure. The subdivisions of the arms begin at 

 the very edge of the cup, and become so numerous as to form a perfect net- 

 work in the shape of a convoluted funnel-like organism of the finest basket- 

 work, instead of the rayed arrangement of the common Encrinite. The stem 

 is made up of tuberculated joints. From the Upper Silurian, Dudley, 

 England. Size, 18 x 3.. 



No. 444. [917, Cast]. Encrinus liliiformis, Schloth. 



Body and stem, on slab. This beautiful and well- 

 known Crinoid has a smooth body in the form of a de- 

 pressed vase. Its base is composed of five plates, upon 

 which rest three successive series of other plates, with the 

 uppermost of which the arms articulate. The stem is 

 long and formed of numerous perforated round ossicles, 

 articulated to each other by radiated grooved surfaces, and 

 becoming somewhat pentagonal and alternately larger and 

 smaller towards the summit. This specimen was found in 

 the Muschelkalk (Middle Trias) of Brunswick, Germany, 

 and is now in the Ward Collection of the University of 

 Rochester. Size, 8x2. 



No. 445. [920, Cast]. Encrinus liliiformis, Schloth. 



Slab, with three bodies and 

 STEMS. This is one of the most choice 

 and perfect specimens of the " Lily- 

 Encrinite" which has ever been found. 

 From the same locality as the preced- 

 ing, of which geological horizon it is ' 

 characteristic. Size, 18 x 9. ' 



No. 446. [932, Cast]. Ichthyocrinus laevis, Conrad. 



This interesting fossil, related to Cyathoerinus, has five triangular basal 

 plates, and a round, smooth, slender column, enlarging towards the cup. This 

 specimen, showing body and stem, is from the Niagara shale (Upper Silurian), 

 Lockport, N. Y. 



