14 



BATOCRINUS INSUETt'S, n. Sp. 



Phiic T, Fig. 8, azijijovs view of calyx, vanlf, jyroboscis and pari 

 of the (inm; Fi<j. 9, side view of same specimen. 



Species rather below medium size. Calyx obconoidal, trun- 

 cated below, about twice as wide as high; surface smooth or 

 finely gi-anular. Column medium size. 



Basals form an hexagonal disc one half wider than the diame- 

 ter of the column, witli a central depression and rim around 

 it, for the attachment of the column. First primary radials 

 wider than high. Second primary radials quadrangular, short, 

 two or more times as wide as high. Third primary radials a 

 little larger than the second, twice as wide as high, pentagonal, 

 axillary, and support on tlie upper sloping sides the secondary 

 radials. In each lateral ray, the third primary radial supports, 

 upon each upper sloping side, two secondary radials, the la.st 

 of which is axillary and supports upon each upper sloping side 

 a tertiary radial, that bears a single arm. There are, there- 

 fore, four arms in each of these rays. The distal side of each 

 third primary radial adjoining the azygous area supports thi-ee 

 secondary radials that bear a single arm; the proximal side of 

 each supports two secondary radials, the last of which is axil- 

 lary and sui)i)orts ujjon each side a tertiary radial that bears 

 a single arm. There are, therefore, three arms to each of 

 the.se rays. In th(! i-ay opposite the azygous area, the third 

 primai'y .supports ujion each upyier sloping side three second- 

 ary I'adials, the last of which su])ports a single arm. There 

 are, therefore, sixteen shii])le ai-ms in this species and sixteen 

 ambulacral openings to tlu; vault. The arms are rather small 

 atid com]K)sed of a double sei'ies of interlocking plates that are 

 slightly d(>e])<'r than wide, in the lower part, but the arms 

 flatten out near the supei-ior ciuls, as th<>y do in many other 

 species in this genus. Pinnules long and dense. 



There are three regular interradials in each area, one large, 

 the other two small. There arc four azygous interradials, one 

 heptagonal, in line with the first primary radials and slightly 

 larger and longei' tlian either of them. It is followed V>y three 

 plates, the middle one? being the larger and longer, but it is 

 cut off from the vault Vjy the tertiary radials. The vault is 

 highly convex, willi a large proboscis that terminates in a 



