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



627 



p. 613 when considering Hemiaster vadosus. As Sarsella duncani occurs on the same 

 horizon, the two species must be compared. The following table shows the marked 

 distinctions between these species : — 



Sarsella duncani. 

 Flush. 

 Carinate. 

 Posterior. 

 Overhanging. 



Petals, 



Posterior interradius, . 

 Maximum height, 

 Posterior margin, . 

 Postero-lateral ambulacra, 



Long, sinuous. 



Internal fasciole, . 



Key-shaped ; blunt behind. 



Sarsella antero-alta. 



Depressed. 



Not carinate. 



Anterior. 



Vertical. 



Broad, blunt ; not sinuous. 

 / Sides straight, ending 

 3 behind as an acute 

 1 angle, and further from 

 V the apical system. 



III. — Miscellaneous Records. 



Family ECHINID^3. 

 Genus Stirechinus, Desor, 1856. 

 Species 1. Stirechinus scillse (Desmoulins), 1837. 

 Synonymy — 



Echinus scillce, C. Desmoulins, 1837, "3m Mem. Ech.," Actes Soc. Linn. Bordeaux, ix. p. 136. 

 Stirechinus scillce, Desor, 1857, Syn. Ech. foss., p. 131. 



„ „ J. Seguenza, 1868, " Formation Zancleene," Bull. Soc. geol. France (2), xxv. 



p. 476. 

 Echinus „ T. Wright, 1864, "Foss. Echinidae Malta," Quart. Journ. Geol. Soc, xx. pp. 475, 



476. 

 „ costatus, Agass., 1846, Cat. rais. Ann. Sci. Nat. Zool. (3), vi. p. 370. 



Type. — (E. costatus), V. 26. 



Remarks. — Dr Wright described a specimen as Echinus scillce, which is apparently 

 the above species ; and the fact that he placed his own name after it was probably only 

 an inadvertence. A specimen of Stirechinus scillce from the Sicilian Zanclean is included 

 in Dr Leith Adams' Collection, and this may have led to the mistake. 



Family GLYPE ASTRIDE. 

 Genus Clypeaster, Lamarck, 1816. 



Species l. Clypeaster reidi, Wright, 1855. 



Clypeaster reidi, T. Wright, 1855, Ann. Mag. Nat. Hist. (2), xv. p. 268-70. 



„ „ Michelin, 1861, "Mon. Clypeastres foss., "Mem. Soc. geol. France (2), vii., No. 2, 



p. 124, pi. xxvi. 



The type specimen of this species, a very close ally of C. gibbosus, is preserved in the 

 British Museum ; the condition of preservation of the specimen, however, suggests that 



