MESOZOIC IIADIATA. 53 



though I think probably referable to the j)rcsent genus, is di- 

 stinguished as a species by the great depth of the two upper 

 joints of the dilated column. 



Rare in the upper chalk, Norwich. 



{Col. University of Cambridge.) 



Bourgueticrinus Milleri (M'Coy). 



There are two species confounded in England under the name 

 Apiocriniis ellipticus of Miller, by whom they are both figured 

 without distinction ; one with the first radial plates, about double 

 the depth of the pelvic plate which most of his figures illustrate, 

 is the one recognized by nearly all continental writers as this 

 species, and as such is figured as the type of the present genus 

 by B^Orbigny ; to it therefore the name B. ellipticus should be 

 retained. The other (fig. 1 of Miller's work) has the first radial 

 and pelvic plates about equal in depth, with the same club-like 

 figure ; this, which is more rare, but constant in its characters, 

 I beg to distinguish by the above name. 



Upper chalk, Norwich. 



{Col. University of Cambridge, &c.) 



Bourgueticrinus ooliticus (M^Coy). 



Sp. Char. Column much-compressed, of thin elliptical joints an- 

 gulated and obscurely tuberculated round the middle of their 

 outer edge ; articular surface having a strong transverse ridge, 

 with a central boss perforated by the small alimentary canal, 

 external margin broad, central oval hollow, deep : long dia- 

 meter 6 lines. 



Among mesozoic crinoids the present genus is well character- 

 ized by its column, and as this is a large weil-marked species, I 

 have not hesitated to characterize it from the portion known on 

 account of the interest attaching to its geological locality, the 

 genus being hitherto only found in the upper chalk. 



Rare in the Bradford clay at Bradford, 



{Col. University of Cambridge.) 



Apiocrinus eocutus (M'Coy). 



Sp. Char. Cup ovate (less ventricose in the middle than the A. 

 Parkinsoni, Schlot., and more so than the A. elegans, Def.) ; 

 about six of the upper columnar joints widen to form the base 

 of the cup and increase greatly in thickness ; on the upper 

 columnar joint rest five pentagonal pelvic plates, alternating 

 above which are five quadrangular basal radial plates (first 

 costals of Miller), on each of which the cuneiform axillary ra- 



