FOSSILS OF THE JIUKLIXUTOX GROUP. 375 



BATOCRIXUS PYRIFORMIS, Shiunard (sp). 



PL 5, Fig. 5. 



AcHnocrinvt pyriformis, SHUJLA.KD. Missouri GeoL Report, part ii, p. 192, 1855. 

 Eatocrintupyrifmrmi*, MEEK and TVORTHEX. Illinois Geol. Report, Vol. n. p. 150, 1866. 



BODY more or less pyriform, being narrow and produced 

 below the second radials, and expanding upward to the 

 arm-bases. Base about twice as wide as high, truncated, 

 and more or less prominent or sub-angular around the 

 lower edge; facet for the attachment of the column, round, 

 rather deeply impressed, and about half as wide as the 

 truncated lower surface of the base ; outer surfaces of the 

 basal pieces rising nearly vertically, or contracting a little 

 upward. First radial pieces comparatively large, generally 

 longer than wide, often distinctly so ; hexagonal and hep- 

 tagonal in form, the lateral edges being longer than any of 

 the others ; all rising vertically from the basal pieces, so as 

 to form with the latter a short cylindrical extension of the 







body. Second radial pieces much smaller than the first, 

 wider than long, and presenting the usual quadrangular 

 form. Third radials about as high as the second, but some- 

 what wider, being always wider than long, and generally 

 heptagoual in form : each supporting on each of its superior 

 sloping sides, in direct succession, two rather large second- 

 ary radials. the upper of which are axillary pieces, and 

 bear on their superior sloping sides, large brachial pieces 

 connecting with each other all around, and bearing the 

 free arms. 



Anal pieces seven or eight, the first one being similar in 

 form to the first radials, and surmounted by two or three 

 smaller in the second range, over which are two or three 

 in the third range, and above the latter one or two others 

 are seen. Interradial pieces five or six to each space, the 

 largest one supporting two smaller in the second and third 

 ranges, while the others are more or less irregularly ar- 



