28 



BATOCRINUS (?) RUSTICUS, n. sp. 



Plate II, Fifj. 3, ha>ial vieir magnified two diameters; Fi(j. 4, same, 

 ndtid-dl size: Fijf. '>, n-.i/uoiif, side; Fifj. 6, summit vieir. 



Species ratlier below inediuiii size, calyx and vault somewliat ecjiial 

 and to<^etlier somewhat lenticular. Aiubulacral o])enings directed 

 horizontally and tiot visible in either a basal or summit view. Calyx 

 very rapidly sijreadiu.t^'from the basal disc, slightly depressed in the 

 iiitorradial areas, and lobed over the radial series. No radial ridges, 

 l)ut the radial series project .so as to not(;h the circumference at the 

 interradial spaces. Ovarian pores not discovered. 



Basal plates very short and form a hexagonal disc bearing a con- 

 cave depression for the attachment of the cohimn. First primary 

 radials larger than the second and third together, wider than long, 

 three hexagonal, two heptagonal. Second primary radials ipiadran- 

 gular, from four to six times as wide as long. Third ))rimary radials 

 a little larger than the sec-ond, pentagonal, axillary, and the ray 

 opposite the azygous area, supports, on each upper sloping side, 

 three secondary radials, which gives to this ray two arms. In each 

 of the other four arms, the third primary radial supports, on each 

 upper sloping side, two secondary radials, the last being axillary 

 and supporting, on each upper sloping side, two tertiary radials. 

 which gives to each of these rays four arms. There arc, therefore, 

 eighteen ambulacral openings to the vault, in this species. The 

 arm formula is 4 4 2 4 4. 



There are three plates in eac'li regular interradial area, one in the 

 first range, followed by two narrow elongated jjlates. in the second 

 range, that unite with the plates t)f the vault. In the azygous area 

 there are six plates. The first is in line with the first primary ra- 

 dials and narrower and smaller than either of them. It is followed by 

 three plates, in the second range, and two in the third range, that 

 unite with the jilates of the vault. 



Vault convex and bears a rather large, convex, central |)late, sur- 

 rounded by seven plates, three of which adjoin the small plates that 

 surround the azygous orifice. The plates over the ambidacral canals 

 are large and tumid, those in the interradial areas smaller and less 

 convex. The azygous orifice is snudl, somewhat elevated, and sub- 

 central. 



