﻿2 14 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



Second row has plates 5, 6, 7, 8, 9. 



Third row has plates 10, 11, 12, 13, 14. 



Fourth row has plates 16, 17, 18, 19, 15. 



Fifth row has deltoid 23. 



Deltoid 23 is very small, situated on top of plate 18, or between it 

 and 13. The hydropore and madreporite are present. Anal area 

 small, placed between plates 7, 8, and 13, and consisting of an 

 outer complete circle of a variable number of small pieces and the 

 pyramid of 6 pieces. One basal and 2 upper pectinirhombs, having 

 long, angulated, grooved, adjoining recesses, with numerous dicho- 

 pores. 



Ambulacra 4, not prominent, undivided, and usually not longer 

 than one-half the length of the theca. Brachioles not abundant. 



Column unlike those of all associated genera in being composed of 

 2 distinct parts. Beneath the theca there are- about 15 segments fol- 

 lowed by a thicker leech-shaped piece from 35 to 55 mm. in length, 

 formed of segments anchylosed together and coated over on the 

 outside by a nodose layer. The lower end of the fused piece seems 

 to have articulated directly with the basal expansion. 



Genotype, L. gebhardii Conrad. 



Lepocrinites is undoubtedly closely related to Apiocystites, but 

 should not be confounded with it, on account of differences pointed 

 out in the remarks on the latter genus. The peculiarity of the column 

 alone should distinguish Lepocrinites from all other associated 

 genera. The fused piece of the column is often extremely abundant 

 in certain crinoidal limestones of the Coeymans at the base of the 

 Devonic in Litchfield and Schoharie counties, New York. 



The earliest species is L. manlius, found near the top of the Amer- 

 ican Siluric ; this is followed by L. gebhardii of the basal Devonic. 

 L.(?) angelini Haeckel of the Upper Siluric of Gotland may also 

 prove to belong here, and not to Apiocystites, on account of the 

 large adjoining pectinirhombs, with numerous dichopores, the similar 

 structure of the ambulacra, and the more numerous brachioles. 



LEPOCRINITES MANLIUS n. sp. 

 (Plate XXXVII, figures 2, 3; Plate XXXIX, figures 15, 16) 

 Length of theca 2 cm. ; greatest width 14 mm. : depth 12 mm. For 

 general form, shape of individual plates and their ornamentation, see 

 the figures and diagram, figure 23. 



Each ambulacrum a little longer than half the length of the theca 

 and bearing on each side about 12 brachioles (or 24 to an ambu- 

 lacrum), of which none is preserved. 



