20 



BATOCRINDS JESSIK.K. U. 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 ivhat 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 Tree 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 Ions 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 lour of the rays, is 

 channeled by two ambulacra] furrows, which gives four ambu- 

 lacra! 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 bu1 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), bul there 

 are only two ambulacra! openings to the vault. There are, 

 therefore, eighteen ambulacra! openings to the vault in this 



species. 



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

 regular interradial area there are five plates. One of moderate 

 size iii the lirsl range, two small ones in the second range and 

 two elongated plates in the third range thai curve over between 



