FROM THE GREY CHALK. 41 



CiDARis VESICULOSA, Golclfms. Plate II, fig. 5, a, b, c, d ; Plate III, fig. 1, a, b, c, d, e. 



CiUARis VESICULOSA, Goldfuss. Petref. Germanise, t. i, p. 120, pi. xi, fig. 2, 1826. 



— — Agassiz. Prod. Me'm. Soc. Nat. de Neuchatel, torn, i, p. 188, 1836. 



— — Desmoulins. Etudes sur les Echiiiides, p. 332, No. 23, 1837. 



— — Bronn. Lethsea Geognostica, p. 607, pi. xxix, fig. 76, 1837. 



— — Geinitz. Charakter der Schichten und Petrefacten Kreide- 



gebirges, p. 89, pi. -xxii, fig. 1, a, b, c, d, 1839. 



— — Roemer. Norddeutschen Kreidegebirges, p. 28, 1840. 



— — Bujardin, in Lamarck, Anim. sans Vert., 2e ed., t. iii, p. 338, 



1840. 



— — Revss. Versteinerungen der Biilim. Kreideform., p. 57, pi. xx, 



fig. 14, 1845. 



— — Agassiz et Desor. Catal. rais. des £ch. Ann. des Sc. Nat., 



3e serie, t, vi, p. 328, 1846. 



— _ Broyxn. Index Palfcont., p. 301, 1848. 



— — Quenstedt. Handbuch der Petrefacktenkunde, p. 575, pi. xlviii, 



fig. 47, 1852. 



— SPINULOSA, Guh-anger. Essai d'un rep. pale'ont. de la Sarthe, p. 40, 1853. 



— VESICULOSA, Desor. Synopsis des Echinides Fossiles, p. 11, pi. v, figs. 24, 



25, 1855. 



— EffiMERi, Cotteau, in Davoust, Note sur les Fossiles speciaux a la Sarthe, 



p. 49, 1855. 



— VESICULOSA, Pictet. Traite de Paleont., 2nd ed., t. iv, p. 254, 1860. 



— — Cotteau et Triger. Echinides de la Sarthe, p. 133, pi. xxv, 



figs. 1—6, 1860. 



— — Cotteau. Note sur les Echinides recueillis en Espagne, par MM. 



Verneuil, Triger, et Collomb., Bull, de la Soc. Ge'ol. de France, 

 2e serie, t. xvii, p. 375, 1860 



— — Cotteau in D'Orbigny's Paleontologie Fran9aise, t. ii, p. 222, pi. 



1050, and pi. 1051, figs. 1—6. 



Test circular, inflated, nearly equally depressed at both poles ; ambulacral areas flexed, 

 depressed in the middle, and filled with from six to eight rows of close-set, nearly equal- 

 sized granules, diminishing to two or four rows near the disc and peristome ; poriferous zones 

 very narrow, and flexuous ; pores small, having a moniliform line of granules separating the 

 pores ; inter-ambulacra wide, four to five plates in each column ; tubercles moderate in 

 size, perforated, and uncrenulated, set very wide apart on the upper half of the test; 

 areas round, superficial, much inflated at the border, and surmounted with a circle of 

 prominent, mammillated granules. Near the disc the tubercles on the alternate columns 

 become dwarfed, are destitute of areolae, and occupy the middle of a long granular plate ; 

 miliary zone large, much depressed, and filled with small equal-sized granules ; discal and 

 oral apertures about the same diameter. 



6 



