1886.] NATURAL SCIENCES OP PHILADELPHIA. 61 



B. CrotalocriniDuE. Base dicyclic. Underbasals unequal, 

 small. Basals generally large. Radials so far as known, 2X5. 

 Arras nniserial, with numerous branches, spreading broadly. The 

 branches of each raj' partly or completely connected by lateral 

 projections or direct union. When completely connected, they 

 form reticulated leaves overlapping when folded. Pinnules 

 wanting. Ambulacral fui'row deep, ramifying with the arm 

 branches, covered by alternating plates and bordered by side 

 pieces. The first anal plate rests on the basals ; it is followed by 

 others which form the base of a ventral tube. Interradials 

 numerous, covering the entire ventral surface, but not more than 

 one or two sometimes none are exposed dorsally. Calj^x roofed 

 over by a pliant integument of irregular plates, extending over 

 the arm bases, and enclosing the summit plates and covering 

 pieces of the disk. Ventral tube lateral. 



Family XI. -ICHTHYOCRINIDJE W. and Spr. 



We are of the opinion that some of the genera described by 

 Angelin are founded upon characters of specific value only, but 

 as the original specimens are unique and inaccessible to us, we 

 cannot, at present, undertake to review them. 



ICHTHYOCRINUS Conrad, Ecv. i, p. 33. 



No new species of Ichthyocrinus have been described since our 

 first list, in which, however, we omitted to notice Ichthyocrinus 

 arthriticus (d'Orbigny), mentioned in Prodr. i, p. 46, which is a 

 Gissocrinus, and also Ichthyocrinus capillar is and /. goniodac- 

 tijlus (d'Orbigny), which Phillips had correctly referred to 

 Gyathocrinus. 



HOMALOCRINUS Angl., Rev. i, p. 35. 



ANISOCRINUS Angl., Rev. i, p. 37. 



CALPIOCRINUS Angl., Rev. i, p. 38. 



LECANOCRINUS Hall, Rev. i, p. 39. 



1882. L. Soyei Oehlert. Bull. Soc. Geol. tie France (ser. 3), vol. x, p. 354, PI. 8, fig. 2. 

 Lower Devonian. Near Sabre, France, 

 Lecanocrinus elegans Billings, see Taxocrinus elegans Billings; Lecano- 

 criuus laevis, Taxocrinus laevis. 



