1879.] NATURAL SCIENCES OF PHILADELPHIA. 263 



the body between the two unequal basals, the adjoining radial, 

 and the other anal plate. The second or upper and larger anal 

 plate is interposed between the primary radials and the upper 

 truncated side of the posterior basal. Column round, composed 

 of rather large joints. 



Hall, Schultze, and Angelin mention no interradials in their 

 generic descriptions, but the latter figures a specimen from Got- 

 land, which he refers to L. macropetalus Hall. It has one exceed- 

 ingly large interradial to each area, which occupies a wide space 

 between the rays, opposite all the primary radials, and as high as 

 the top of the second or third secondary radial. No New York 

 specimen of this species has ever been found with such a plate 

 or even a trace of it, and as the two differ besides decidedly in the 

 size of the basals, in the form and proportions of the body, and 

 in other characters, we consider the Swedish form even generically 

 distinct. (See Anisocrinus Angelini, W. & Spr.). 



Geological and Geographical Distribution. This genus is rep- 

 resented in the Upper Silurian by 5 species, 4 from America, and 

 1 from Europe. From the Devonian but a single species is known, 

 and none from the Subcarboniferous. 



The following are the known species : 



1878. Lecanocrinus Billingsi Angelin. Iconogr. Crinoid., p. 12, pi. 22, fig. 25 a. 



Upper Silur. Gotland, SweJ. 

 1852 Lecanocrinus calyculus(?) Hull. Geol. Reps., N. Y., vol. ii. p. 203, pi. 



46, figs. 3 a, b. Niagara gr. Upper Silur. Lockport, N. Y. 

 1858. Lecanocrinus macropetalus Hall (not Angelin). (Anisocrinus Angelini, 



W. & Spr.). Type of the genus. Geol. Rep., N. Y. Vol. ii. p. 199, pi. 



45, figs. 1 a-h. Niagara gr. Lockport, N. Y. 

 1852. Lecanocrinus ornatus Hall. Geol. Rep., N. Y.. vol. ii. p. 201, pi. 44, figs. 



2 a-m. Niagara gr. Lockport, N. Y. 

 *1862. Lecanocrinus pusillus Hall. (Cyathocr. pusillus.) New Foss. of Niagara 



gr. p. 6, and 28th Rep., N. Y. State Cab. Nat. Hist , pi. 15, figs. 1-6. 



Niagara gr. Waldron, Ind. 



Winchell and Marcy, Memoirs Bost. Soc. Nat. Hist., p. ; 0, de- 

 scribed a cast from the Niagara limestone of Chicago under the 

 species Lecanocr. pusillus, which is probably identical with Hall's 

 Cyathocrinus pusillus. The description is not sufficient to decide 

 it fully. 



1867. Lecanocrinus Rcemeri Schultze. Echinod. Eifl. Kalk, p. 41, pi. 3, figs. 8 a-g. 

 Devonian. Eifel, Germ. 



