FROM THE LOWER CHxVLK. 



219 



EcHiNOcoNUs suBROTUNDUs, MmMl, 1822. PI. LII, fig. 1 a—f; PI. LIII, fig. 2 a—^f. 



fig. 3. 



CoNDLDS SUBROTUNDUS, Mantell. Geol. of Susse.x, p. 191, tab. xvii, figs. 15 — 18, 



1S22. 

 Galerites subrotunda, Agassiz. Monogr. des Radiaires, jMem. Soc. des Sc. Nat. de 



Neuchatel, t. i, p. 186, 1836. 



— — Besmoulins. fitudes sur les Echinides, p. 256, 1837. 



— — Bvjardin. In Lamarck's Auimaux sans Vertebres, 2e ed., 



t. iii, p. 313, 1840. 



— — Besor. Monogr. des Galerites, p. 18, tab. ii, figs. 11 — 14, 



1842. 



— — Morris. Catalogue of British Fossils, p. 53, 1843. 



— — Agassiz and Besor. Catal. rais. des Echinides, Ann. Sc. 



Nat., 3e serie, t. vii, p. 148, 1847. 



— Leskei, Besor. Id., p. 148, 1847. 



— SUBTRUNCATA, d'Orhigny. Prod, de Pal., t. ii, p. 272, 1850. 



— SUBROTUNDUS, Forbes. In Di.xon's Geol. of Sussex, p. 340, 1850. 



— Forbes. Mem. of Geol. Survey, decade iii, p. 6, 1850. 



— — Morris. Catal. of Brit. Foss., 2nd ed., p. 80, 1854. 

 d'Orbigny. Rev. et Mag. Zoologie, t. vi, p. 20, 1854. 

 Cotteau. Paleontol. Francaise terrains Cretaces, t. vi, 



p. 517, pi. 997, figs. 8— 12, 1856. 

 Besor. Synopsis des Echinides Fobs., p. 183, 1S5G. 

 Cotteau. Echinides de la Sarthe, p. 283, pi. xlvii, fig. 4, 



1860. 



ECHINOCONUS — 



Galebites 

 echinoconus 



Diagnosis. — Test subcircular, rounded anteriorly, a little contracted, and subangular 

 posteriorly ; upper surface elevated, sub-conoidal and convex ; base flat, rounded at the 

 border, sides a little inflated ; mouth-opening small, roundish central ; vent large, 

 luarginal, elliptical ; ambulacra narrow, plates of both areas covered with small flat, 

 equal-sized tubercles. 



Description. — Under the name Galerites vulgaris, Leske, it is probable that moulds of 

 IE. subrotundiis have been included. Klein's tab. xiii, fig. c — k, and tab. xiv, fig. a — k, 

 are cited by Lamarck as types of G. vulgaris. As these figures all represent siliceous 

 moulds, a doubt may be allowed to rest on their identity with the form I have figured in 

 Plates LII and LIII. Dr. Mantell also s-ave the name Conulus subrotmidus to a doubtful 

 cast ; but Desor has published excellent figures of this species from an English specimen 

 collected in the Isle of Wight, and contained in the IMuseum at Neufchatel. Professor 



