610 MR J. W. GREGORY ON THE MALTESE FOSSIL ECHLNOIDEA. 



Dimensions — 



Length, ..... 



Width, ..... 



Height, ..... 



Apical system : distance from anterior 

 margin, .... 



Ambulacra : anterior — length of right 

 poriferous zone, 



Ambulacra : anterior — length of left pori- 

 ferous zone, .... 



Ambulacra : anterior — width, 



85 



mm. 



78 



)> 



38 



!! 



37 



>> 



30 



>! 



27 



»J 



7 



)> 



Ambulacra : antero-lateral — length of an- 



tero-poriferous zone, . . .25 mm. 



Ambulacra: antero-lateral — length of post- 

 poriferous zone, . . . 30 ,, 

 Ambulacra : antero-lateral — width, . 8'5 ., 

 „ postero-lateral — length of an- 



tero-poriferous zone, . 39 ,, 



„ postero-lateral — length of post- 



poriferous zone, . . 34 ,, 



,, postero-lateral— width, . 8*5 ,, 



Type.— Brit. Mus., E. 1865. 



Distribution. — Malta — Lower Coralline Limestone (Oligocene). 



Remarks. — This specimen was well described and figured by Dr Weight in the work 

 above cited ; but for reasons already given (p. 609), it is considered by the writer that 

 this is not the same species as that which Continental palaeontologists accept as E. scuti- 

 formis, Leske. It differs from this in the more depressed form, the anterior position of 

 the apical disc, and the absence of the rostrum. From E. suessi, Laube, # which has 

 been recorded t on the corresponding horizon in Sicily, it may be readily distinguished 

 by the more central position of the apical disc in Dr Laube's species. 



Family SPATANGIDJE. 



Division Prymnadetes. 



Genus Hemiaster, Desor. 



Species l. Hemiaster cotteaui, Wright, 1855. 



Synonymy- 



Hemiaster cotteaui, T. "Wright, 1855, "Foss. Echinod. Malta," Ann. Mag. Nat. Hist. (2), xv. pp. 

 190, 191, pi. vii. f. 2. 

 „ ,, E. Desor, 1858, Syn. Ech. foss., p. 375. 



„ „ T. Wright, 1864, "Foss. Echinidse Malta," Quart. Journ. Geol. Soc, xx. p. 483. 



G. Mazzetti, 1882, "Ech. foss. Montese," Atti Soc. Nat. Modem (2), xv. p. 117. 

 Opissaster „ Pomel, 1883, Classif. meth. et genera Ech., p. 38. 



Type.— Brit. Mus., E. 1584 (?). 



Distribution. — Malta — Globigerina Limestone. Italy — Montese (Serpentinosa 

 molassa). 



Remarks. — In retaining this species in Hemiaster, it is not intended to suggest that 



* "Vicentinische Ech.," Denlcsch. k. Ale. Wiss. Wien, xxix. Abt. ii. p. 24, pi. iv. f. 2. 



t L. Baldacci, Mem. desc. Carta geol. Italia, i. p. 109 ; A. de Gregorio, 1881, Fauna Argille Scagliosa di Sicilin, 

 Palermo, p. 11, pi. i. f. 2. 



