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



Echinolampcu UnJdi, Goldf., 1829, Petref. Germ., i. lief 2, p. 133, pi. xlii. f. 4. 



,, „ Agassiz and Desor, 1847, op. cit, t. vii. p. 166. 



„ „ Desor, 1857, Syn. ficli. foss., p. 309. 



Clypeaster semiylobus, Grateloup, 1836, op. cit., Actes Soc. Linn. Bordeaux, viii.' p. 145, pi. i. f. 7. 



Type.—^o. 34. 



Distribution. — Malta — Upper Coralline Limestone, Ghain Toffica, Greensand. Corsica 

 — Cadelabra. France — St Paul trois Chateaux, Couronne Martigues ; near Tlsere 

 (Helvetian) ; Marrosse, Landes (Faluns blues). Italy — Pianosa (? Tortonian) ; Castel 

 Arquato (Pliocene) ; ? Montese (Serpentinosa molassa, Langhian) fide Mazzetti. Austria 

 — Kalksburg, Soskut, &c. (Second Mediteran-Stufe). Cyprus. Asia Minor. 



Species 2. Echinolampas manzoni, n. sp.* 

 Synonymy — 



Echinolampas richardi {non Desmar), T. Wright, 1855, " Foss. Echinod. Malta," Ann. Mag. Nat. Hist. 



(2), xv. pp. 124, 125. 

 ,, laurillardi (non Ag. and Des.), T. Wright, 1864, "Foss. Echinidse Malta," Quart. Journ. 



Geol. Soc, xx. p. 480. 

 ,, depressa (non Gray), A. Manzoni, 1880, "Ech. foss. Mol. serp.," Denk. k. Ale. Wiss. Wien, 



xlii. Aht. 2, pp. 186, 187, pi. i. f. 4-15. 

 ; , ,, (non Gray), A. Manzoni, 1881, " Spugne Mol. mioc. Bolognese," Atti Soc. 



Tosc. Sci. Nat, v. p. 174. 

 ,, ,, (non Gray), G. Mazzetti, 1882, "Ech. foss. Montese," Atti Soc. Nat. Modena 



(2), xv. p. 123. 



Diagnosis. — Form elongated, well rounded in front, produced into a prominent 

 rostrum behind ; sides flat. Seen from the side it is high and conical. The apex is 

 coincident with the apical system, and exce'ntrie anteriorly. The whole abactinal surface 

 is well rounded and tumid. The lower margin is wavy; the anterior margin is tumid, 

 while the posterior is lower, as from the apical system there is a long gradual backward 

 slope. The actinal surface is concave around the mouth. 



Apical system : Excentric anteriorly ; four genital pores irregularly arranged. 



Ambulacra. : The length of the poriferous zones is very unequal in all the ambulacra. 

 In the anterior ambulacrum either the right or left side of the petal may be the longer. 

 In the antero-lateral petal the posterior pair are nearly twice as long as the anterior pair. 

 In the postero-lateral the proportion is reversed. 



The petaloid areas are wide, the pores small, round, and nearly equal. 



Epistroma : Of uniform tubercles of the ordinary size ; evenly scattered. 



Mouth subcentral, but a little before the anterior ; situated in the centre of a de- 

 pressed area. Pentagonal in shape ; phyllodes broad ; bourrelets low and inconspicuous. 



Anus oval, transverse ; on a conspicuous rostrum. 



* M. Pomkl suggested this name in 1883 (Genera, p. 62), but gave no diagnosis, and appears to have subsequently 

 abandoned it, so it may be dismissed as a list name only. 



