622 MR J. W. GREGORY ON THE MALTESE FOSSIL ECHINOIDEA. 



Metcdia loveni (Cott.) from the Eocene (?) of St Barthelemy,* but from this it may 

 readily be distinguished by the greater depth of the anterior groove and the absence 

 of the overhanging posterior projection in the West Indian species. In both of these 

 points this new species more resembles Metcdia elegans (Agassiz, M.S. ;t ArchiacJ), but 

 in that species the apical system is more central, and the anterior ambulacra less 

 divergent and equal in length to the posterior pair. Dr Dames § has described as Metalia 

 c/r. elegans, Ag., a specimen from the Schio Schichten in which the apical system is 

 excentric anteriorly ; this is very likely to be the same as the Maltese species. It occurs 

 on approximately the same horizon, whereas Archiac's type came from a much lower 

 bed. But as Dr Dames includes among his synonyms the figures of Von Schauroth's || 

 referred to B. elegans, they may be distinct. The Coburg type is clearly different, and 

 the figures show it to be a true Brissopsis allied to B. crescenticus, Wr. ; but as Professor 

 Dames' opinion is not one that can be lightly disregarded, probably the specimen shows 

 structures missed by Von Schauroth's artist. 



Synonymy- 



Genus Brissopsis, L. Agassiz, 1840. 

 Species l. Brissopsis duciei, Wright, 1855. 



Brissopsis duciei, T. Wright, 1855, "Foss. Echinod. Malta," Ann. Mag. Fat. Hist. (2), xv. pp. 185-7, 

 pi. vi. f. 1. 

 „ „ E. Desor, 1858, Syn. itch, foss., p. 379. 



„ „ T. Wright, 1864, "Foss. Echinidse Malta," Quart. Journ. Geol. Soc, p. 484. 



Type. — Coll. Earl of Ducie. 



Distribution. — Malta — Upper Coralline Limestone. 



Species 2. Brissopsis crescenticus, Wright, 1855. 

 Synonymy — 



Brissopsis crescenticus, T.Wright, 1855, "Foss. Echinod. Malta," Ann. Mag. Nat. Hist. (2), xv. 



p. 187, pi. vi. f. 2. 

 Toxolrissus „ A. Gaudry, 1862, "Geol. ile de Chypre," Mem. Soc. geol. France (2), vii. 



No. 3, p. 300. 



* G. Cotteau, "Ech. tert. lies St Barthelemy et Anguilla," K. Svensk Vet. Ah Handl., xiii., No. 6, 1875, pp. 41, 42, 

 1.1. viii. f. 7, 8. 



t Brissopsis elegans, Agassiz, 1840, Cat. Syst. Ectyp. Foss. Ech. Neoc., p. 3. 



I D'Archiac, "Description des fossiles du groupe nuinmuliticpie recueillis .... aux environs de Bayonne et de 

 Dax," Mem. Soc. gM. France (2), iii., 1850, p. 424, pi. x. f. 20. 



§ W. DAMES, " Die Echiniden der vicentinischen und veronesischen Tertiiirablagerungen," PaUontographica, xxv., 

 1877, p. 70. 



|! C. von Schauroth, Verzeichniss der Versteinerungen im Herzoglichen Naturalien Cabinet zu Coburg, Coburg, 1865 

 p. 192, i.l. xi. f. 2. 



