330 Systematic Paleontology 



Apiocystites geihardii Jaekel, 1899, Stammesgeschichte der Pelmatozoen, 1, 



p. 282, fig. 59 on p. 280. 

 Lepocrinites gebliardii Schuchert, 1904, Smith. Misc. Col., vol. xlvii, pt. ii, 



p. 215. 



Description. — " Body oblong, oval or ovoid, compressed at the sides, un- 

 symmetrical, being much more gibbous on the lower part of the posteal 

 or ovarian side than on the opposite ; usually abruptly rounded above and 

 obliquely subtruncate below. The basal series consists of four unequal 

 plates, 1, 2, 3, -J ; the second series of five, 5, 6, 7, 8, 9 ; the third series of 

 four, 10, 11, 12, 13 ; and the fourth or supraovarian of five, 11, 15, 16, 17, 

 18 ; making the fonnula B, 1 + 5 + 1 + 5. The supraovarian plate extends 

 downwards on each side, half enclosing the aperture : ovarian and circa- 

 ovarian plates unknown. Plates of the summit unknown. A reniform de- 

 pression and anal pore a little upon the left of the center. 



"Arms four, consisting of an anterior and posterior pair, which lie in 

 shallow grooves along the rounded angles of the body, reaching nearly or 

 quite to the base, and rising much above the surface of the adjoining 

 plates; the anterior pair nearer to each other than the posterior pair, ex- 

 tending downward nearly to the base. The arms are composed of a double 

 series of plates, each alternate one being similar. A range of minute ossi- 

 cula extends along the center of the groove between the plates of the arms, 

 from which diverges a shorter range to the sinuosities of the arms, where 

 originate the fingers or pinnules. Fingers slightly alternate, but preserv- 

 ing the appearance of being in pairs or opposite ; composed of a double 

 series of ossicula, closely interlocking at their contiguous wedgeform 

 margins, and standing erect from the surface of the body, or lying close 

 upon the arms and infolded in pairs beneath each other. Surface of plates 

 granulate ; the granulations without definite arrangement, or in concen- 

 tric lines parallel to the margins of the plate, and often elongated in the 

 same direction, sometimes even forming continuous ridges. The pecti- 

 nated spaces on the basal plate, and on 12 and 13, are elongate reniform, 

 and those on the adjoining plates are triangular; neither being sym- 

 metrical or equilateral. From twenty to thirty bars may be counted in 

 each of the pectinated spaces. 



" Column composed of two distinct parts : the upper, consisting of about 

 fifteen articulations, is flexible; and the lower part, larger and of greater 



