TERRAIN JURASSIQUE. 209 
Coll. Davoust. | 
ExPLICATION DES FIGURES. — PI. 56, fig. 1, C. Davoustia- 
nus, vu de côlé; fig. 2, face sup.; fig. 3, face inf. ; fig. 4, 
plaques ambulacraires prises sur la face sup., grossies; 
fig. 5, plaque interambulacraire grossie; fig. 6, appareil 
apical grossi; fig. 7, tubercules grossis. 
N° 42. Ciypeus Michelini (Wright), Desor, 1855. : 
PI. 57. 
Nuclevlites Michelini, Wright, On new. sp. of Ech. from the 
Lias and Ool., p. 23, pl. 11, fig. 6 a-c, 
1854. 
_ = Forbes in Morris, Catal. of Brit. Foss., 
2° ed., Additional Sp. of Echinod., 
1854. 
Fe _ Wright, Report. Ool. Echin. Brit. 4ss., 
1857. 
Clypeus Michelini, Desor, Synops. des Ech. foss., p. 266, 
1858. 
— — Wright, Monog. of Brit. Foss. Echinoderm. 
from the Ool. Format., p. 369, pl. 366, 
fig. 2a,b,c, d, 1859. 
_— — Wright, On the Subd. of the inf. Ool. in 
the south of England Compar, with 
Equival. Beds of the Form. on the 
Yorkshire Coast, p. 33, Quarterly Jour. 
of the Geol. Soc., 1860. 
— — Colteau et Triger, Ech. du départ. de la 
Sarthe, p. 351, pl. cv, fig. 11 et 12, 
1861. 
— — Dujardin et Hupé, Hist, nat. des z00ph. 
Echinod., p.580, 1862. 
— — Huxley et Etheridge, Catal. of the Coll: 
of Foss.in the Museum of Pract. Geol. 
p. 222, 1865. 
— — Cotteau et Triger, Echin. du départ. de la 
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