54 



CIDARIS 



Cidaris sceptrifera, Mantell. PL V, figs. 16, 17; PL VI; PL VII, figs. 1, 2; PL 



VII a, figs. 1, 3. 



Cidaris cucumerina, 

 — sceptrifera, 



CRETOSA, 



VESICULOSA, 



— SCEPTRIFERA, 



Parkinson. Organic Remains, vol. iii, pi. iv, fig. 2, 1811. 

 Mantell. Geol. of Sussex, p. 194, pi. xvii, fig. 12 (spine), 



1822. 

 Agassiz. Catal. Syst. Ectyp. Foss., p. 10, 1840. 

 Reenter. Norddeutschen Kreidegebirge, p. 28, 1840. 

 Morris. Catalogue of Brit. Foss., p. 49, 1843. 

 Agassiz et Desor. Catal. rais. des Echinides ; Ann. Sc. 



Nat., 3e ser., t. vi, p. 328, 1846. 

 Reuss, pars. Versteinerungen der Bohmischen Kreidefor- 



mation, p. 57, pi. xx, fig. 15, 1846. 

 Graves. Essai sur la Topogr. Geol. du Dep. de l'Oise, 



p. 688, 1847. 

 Bronn. Index Palseontologicus, p. 298, 1848. 

 d'Orbigny. Prod, de Pal. Strat., t. ii, p. 2/4, 1850 

 Sorignet. Ours, de l'Eure, p. 6, 1850. 

 Forbes, in Dixon, Geol. of Sussex, p. 338, pi. xxv, figs. 3 — 7, 



1850. 

 Forbes, in Morris, Catal. of Brit. Foss., 2nd edit., p. 74, 1854. 

 Desor. Synopsis des Echinides Foss., p. 13, pi. v, fig. 28, 



1855. 

 Woodward. Mem. of the Geol. Survey, Dec. v, expl. to 



pi. v, fig. 12, 1856. 

 Leymerie et Raulin. Stat. Geol. du Depart, de l'Yonne, 



pp. 510—620, 1858. 

 Coquand. Synops. des Foss. Form. Cre't. du Sud-Ouest de 



la France; Bull. Soc. Geol., 2e se'r., t. xvi, p. 1013, 



I860. 

 Cotteau et Triger. Ech. du Dep. de la Sarthe, p. 253, 



pi. xlii, figs. 1—8, 1860. 

 Cotteau. Paleont. Francaise, p. 251, pi. 1056 - 57 - 58^ 



1863. 

 Hupe. Hist. Nat. Zooph. ; Echinodermes, p. 480, 1862. 



Test moderately large and inflated ; more or less elevated, and nearly equally flattened 

 at both poles ; ambulacral areas narrow, depressed, flexuous, with six rows of granules in 

 the middle, diminishing to four rows above and below ; poriferous zones narrow, winding, 

 ;md depressed ; inter-ambnlacral areas wide ; plates very large, five to six in a column ; 

 areolae deep, circular, with an elevated, prominent, scrobicnlar margin, encircled by a 

 .series of small granules, scarcely larger than those of the miliary zone ; boss not prominent, 

 summit feebly crenulated in young, and smooth in old shells; tubercle moderate in size 

 and perforated ; proximal discal plate in each column with a rudimentary tubercle, and an 

 elongated obsolete areola; miliary zone filled with small, equal-sized granules, much 



