70 



BATOCRINUS REPERTUS, 11. Sp. 



Plate IV, Fig. 28, azygous side. Fig. 29, oj>posite view; Fig. 30. 



summit. 



Species below medium size. Calyx bowl-shaped, the projections 

 of the radial series at the top give it a somewhat pentagonal out- 

 line, when seen from above; more than one-half wider than high. 

 Plate3 convex. Radial ridges undefined. Surface fiuely granular. 

 Columu small and pierced by a small, cinquefoil canal. 



Basals form a small hexagonal disc, with re-entering angles. 

 The disc expands slightly upward and has a diameter about one- 

 half greater than the diameter of the column, which is inserted 

 in a rounded, radiately lined depression below. The lower and 

 outward sides of the basals are rounded. First primary radials 

 the largest plates in the body, a little wider than Jong, three 

 hexagonal, two heptagonal. Second and third primary radials to- 

 gether smaller than the first. Second primary radials, quadrangu- 

 lar, twice as wide as long. Third primary radials a little larger 

 than the second, one heptagonal, two hexagonal and two heptag- 

 onal, axillary, and, in the ray opposite the azygous area, which 

 bears the heptagonal plate, support, on each upper sloping side, 

 two secondary radials, which gives to this ray two arms, fn the 

 ray, on each side of the azygous area, the third primary radials, 

 which are pentagonal, support, on each upper sloping side, two 

 secondary radials, the last one, which adjoins the area, is axillary, 

 and supports, on each upper side, a single, tertiary radial, which 

 gives to each of these rays three arms. One of the lateral rays 

 is constructed in the same way and bears three arms. In the left 

 lateral ray, the second secondary radials are both axillary, and 

 support, on each upper side, a tertiary radial, which gives to this 

 ray four arms. There are, therefore, fifteen arms in this species. 

 The arm formula is 3+3+2+4+3. 



There are three plates in each regular interradial area, one fol- 

 lowed by two smaller ones, in the second range, which do not 

 connect with the vault. There are nine plates in the azygous 

 area. The first one is in line with the first primary radials and 

 about the same size. It is followed by three plates, in the second 

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

 fourth range, that connect with the plates of the vault. 



