20 



BATO0RINU8 ALTIUSCULUS, n. Sp. 



Plate V, I'ig. J, side view, azygous area on the right; tig. ^, 

 azygous view; Fig. S, summit view of tlie same speci- 

 men, part of the top being broken away. 



Body large, above the medium size. Calyx long, somewhat 

 bell-shaped, very slowly and somewhat evenly expanded from 

 the base to the second radials and then spreading horizontally; 

 nearly as high as wide; arm openings directed horizontally; 

 plates convex; sutures depressed; surface smooth or finely granu- 

 lar. 



Basals form a subcylindrical cup nearly as high as wide, 

 truncated and round at the base, with a round facet for the 

 attachment of the column deeply impressed, and about two- 

 thirds of the diameter of the base. The columnar canal is large 

 and pentagonal. A little above the truncated base there is a 

 high transverse ridge across each plate, that is broken at the 

 sutures, giving to this band when viewed from below a sub- 

 hexagonal outline. Above the band the basals slowly expand. 

 First radials longer than wide, nearly as large as the basals, 

 lower third most convex, three hexagonal, two heptagonal, and 

 rising almost vertically from the basals. If the usual quadran- 

 gular second radials exist, in this species, they are auchylosed 

 with the third radials, in our specimen, so as to form single 

 pentagonal plates about one-third as large as the first radials, 

 axillary, and bearing upon each upper sloping side two secondary 

 radials, the second being larger than the first. The second 

 secondary radials are axillary a.nd bear two or three tertiary 

 radials upon each superior sloping side, which gives to the 

 species twenty arm openings to the vault. 



Regular interradials, two in each area, one above the other, 

 the second one less than half as large as the first, and situated 

 between the secondary radials. There are seven plates in the 

 azygous area. The first one is in line with the first primary 

 i-adials and of about the same size, being slightly narrower and 

 a littk; longer. It is followed by a range of three plates, each 

 of which is about one-third as large as the first. There are 

 three small plates in the third range, below the tertiary radials, 

 in the adjoining radial series. 



