ECIIINODERMATA. J^g 



No. 891. Actinocrinus uinbrosus, Hail. 



Another variety ; same formation and locality. Price $0 20 



No. 892. Actinocrinus verrucosus, Hall. 



From the same formation and locality as the preceding. Price, $0.15. 



No. 893. Agaricocrinus tuberosus, Troost. 



This generic name was proposed by Dr. Troost in 1850, for certain mushroom- 

 shaped Crinoids, which, in the number and arrangement of the body-plates, 

 present considerable analogy with Actinocrinus. The typical species is A. Amer- 

 icanus, Roemer, with which this is identical. From the Keokuk limestone (Car- 

 boniferous), Warsaw, HI. Price, $ 0.30. 



No. 894. Agaricocrinus Whitneldi, Hall. 



From the same locality as the preceding. Price, $0.25. 



No. 895. Agaricocrinus "Wortheni, Hall. 



With arms free. From the same locality as the preceding. Price, $0.50. 



No. 896. Agelocrinus Kaskaskiensis, Hall. 



This generic name was given by Vanuxem to include star-like Crinoids 

 " clustering together so as to form one system." It is now known that they are 

 Cystideans of a very remarkable type, being destitute of a stem. The general 

 form of the calyx is hemispherical. This specimen is from the Chester lime- 

 stone (Carboniferous), Kaskaskia, 111. Price, $0.30. 



No. 897. Ancyrocrinus spinosus, Hall. 



The Crinoids of this genus were probably free when adult. They have the 

 form of a bulb or thickened column, with lateral ascending processes and a cen- 

 tral ascending column. This specimen is from the limestone of the Upper Hel- 

 derberg (Devonian), Falls of the Ohio. Price, $0.25. 



No. 898. Apiocrinus Parkinsoni, Schloth. 



Two bodies and two stems branching from one 

 root ; young. The " Pear-encrinites " have a complicated, 

 expanded root, a long column composed of numerous 

 ossicles, and a pyriform receptacle, with arms well devel- 

 oped and regularly bifid. In this species, the stem is com- 

 paratively short. This specimen is from the Great Oolite, 

 Bradford, England, and now in the private Geological 

 Cabinet of Mr. Ward, Rochester. Size, 6x3. Price, $1.25. 



