20 



BATOCRINUS JESSIES, Tl. Sp. 



Plate I, Fig. 27, azygous view of a specimen with basals and part 

 of first radials broken off; Fig. 28, summit of same; Fig. 

 29, basal view of same specimen; Fig. 30, lower 

 part of the calyx of what is believed to be 

 another specimen; Fig. 31, azygous 

 view of what is supposed to be a 

 cast of the same species; Fig. 

 32, basal view of the cast. 



Species medium size. Calyx somewhat bell- shaped, truncated 

 below, cylindrical, in the region of the first primary radials, 

 and then rapidly expands to the free arms and is deeply 

 notched in the interradial areas. The secondary radials project 

 horizontally beyond the interradial areas. The plates are plain 

 and smooth. Column round and small. Columnar canal minute. 



The basals are about twice as wide as high and form a low 

 cup slightly beveled at the basal sutures and having a small 

 basal rim. It bears an hemispherical depression, radiately lined, 

 for the insertion of the column. The diameter of the column 

 is about half the diameter of the basal disc. The first radials 

 are about as lone: as wide, three hexagonal and two heptagonal. 

 They stand nearly vertical on the basals and form a round 

 cylinder. Second radials comparatively very small, quadrangu- 

 lar, from one-half wider to twice as wide as high. Third pri- 

 mary radials of unequal size, larger than the second primary 

 radials, three heptagonal, one hexagonal, one pentagonal, axil- 

 lary and each bears on each superior sloping side two secondary 

 radials. Each second secondary radial, in four of the rays, is 

 channeled by two ambulacral furrows, which gives four ambu- 

 lacral openings to the vault, in each of these rays, without the 

 existence, apparently at least, not only as shown by the. speci- 

 men preserving the plates but by the cast also, of any tertiary 

 radials. In the ray opposite the azygous area there are also 

 two secondary radials (only one is shown in the illustration, 

 because the other is broken off from the specimen), but there 

 are only two ambulacral openings to the vault. There are, 

 therefore, eighteen ambulacral openings to the vault in this 

 species. 



All of the interradial areas connect with the vault. In each 

 regular interradial area there are five plates. One of moderate 

 size in the first range, two small ones in the second range and 

 two elongated plates in the third range that curve over between 



