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



599 



Dimensions — 













H. semiglobus (33, b), 







Agassiz's 



3ast. 



Length, ..... 



155 mm. 137 



mm. 



Width, 



150 , 



, 136 



» 



Height, ..... 



64 , 



66 



>) 



Max. width of poriferous zone, 



3 , 



3 



>; 



„ ,, interporiferous zone, . 



17 , 



8 



)) 



Apical system, distance from anterior margin, 



72 , 



69 



>> 



Mouth do. do. 



72 , 



69 



>J 



Anus, width, .... 



14 , 



14 



jj 



„ length, .... 



7 , 



7 



)) 



Distribution. — Malta — Greensand. 

 Type.— Brit. Mus., 40368. 



Remarks. — This species must be compared with the species (Galerites semiglobus) so 

 well figured by Grateloup,* and which M. Cotteau has made the type of a new genus, 

 Heteroclypeus. t 



The Maltese species differs from the type in that in the latter ( 1 ) the mouth is either 

 central or has a slight tendency to become posterior ; (2) the form is conical ; and (3) 

 there is a slight concavity running round the test just above the margin, so that the edge 

 is thin. Of far greater importance is the fact that the poriferous zones are much wider 

 in H. semiglobus, and in the same species the petaloid areas close at but a little distance 

 from the ambitus. 



The species is common in Malta, and was identified by Dr Wright as Conoclypeus 

 plagiosomus, Ag. ; but in this species there is no raised perignathic girdle, and hence it 

 belongs to a different group, and is a true Echinolampad. After having had a specimen 

 from Corsica in the British Museum cut to determine this point, I heard from M. 

 Cotteau that he had no doubt that Agassiz s species was a Palseolampas. 



Species 2. Heteroclypeus subpentagonalis, n. sp. 

 Synonymy — 



Conoclypeus plagiosomus, Laube (non Agassiz), 1871, " Ech. oesterr.-ung. ob. Tertiarbl.," Abh. k. k. 



geol. Reichs., v. pp. 67, 68, pi. xix. f. 3. 

 Galerites conoideus {non Lamarck), A. Aradas, 1850, "Monog. Ech. viv. foss. Sicilia," Atti Ac. 



Gioen. Sci. Nat. Catania (2), vii. pp. 237, 238. 

 Conoclypeus „ ,, G. Mazzetti, 1882, "Ech. foss. Montese," Atti Soc. Nat. 



Modena (2), xv. p. 124, pi. ii. f. 1. 



Type. — K. k.. geol. Reichs. Wien. Coll. Earl of Ducie. 



Distribution. — Malta — Greensand (Helvetian). Italy ? — Montese (Serpentinosa 



* " Memoire de Geo-Zoologie sur les Oursins fossiles (Echinides)," Actes Soc. Linn. Bordeaux, viii., 1836, pp. 155, 156, 



:. %. 7. 



t " Pal. Fran?. Terr. Tert," toe. tch., ii., 1891, p. 194. 



PI. I. fig. 7 



