DIASTOPOEA. 125 



Bidiastopora michelini, D'Orbigny, 1849, Prod. Pal. t. i. p. 317. 

 Mesenteripora dcedalea, Blainville, 1830, op. cit. p. 397. 



,, ,, Blainville, 1834, op. cit. p. 432, pi. Ixxi. 



Diastopora foliacea (non Lamx.), Michelin, 1846, op. cit. p. 239, pi. Ivi. fig. 8. 

 Bidiastopora microphylla, D'Orbigny, 1849, Prod. Pal. t. i. p. 317. 

 Mesenteripora ,, D'Orbigny, 1852, op. cit. t. v. p. 808. 



Diastopora ,, ? Haime, 1854, op. cit. p. 191. 



Bidiastopora latifolia, D'Orbigny, 1852, op. cit. p. 799. 

 Diastopora ,, Haime, 1854, op. cit. p. 191. 



? ,, conferta, Eeuss, 1867, Bry. braun. Jura Balin: DenJc. k. Akad. 



Wiss. Wien. Bd. xxvii. p. 10, pi. ii. fig. 6. 



DIAGNOSIS : 



Zoarium hemispherical, formed of interlocking, contorted, bi- 

 larninate fronds. The surface appears cerebriform, as the sinuous 

 edges of the fronds are separated by narrow depressions. 



Zocecia short and very crowded. Only visible at the distal ends. 

 Peristomes well raised. Zocecia fusiform. The distribution of the 

 peristomes is along irregular curved lines ; but in some places the 

 linear arrangement is not apparent. 



Formula. p, c, I, r = 2, 1, I", rl. 



DISTRIBUTION. 



BRITISH : 



Forest Marble : Wiltshire. 



Great Oolite : Hampton. 



Inferior Oolite : Postlip ; Stroud (fide Witchell). 



FOREIGN : 



Batbonian : Lebisey and Eanville, Calvados ; La Jonneliere, Sartbe 



(fide Haime). Braun Jura: Balin. 

 Bajocian : Montvaux. Zone of Cosmoceras subfurcatum : Amanvilliers 



(fide Terquem). 



Description of Figure. PL VII. Fig. 2. Part of a zoarium, 

 X 17 dia. Forest Marble : Wiltshire. Cunnington Coll. 24770. 



Affinities. This species is well characterized by its crowded, 

 short, fusiform zocecia. The form figured as Diastopora scolinula 

 by Michelin has the same features, and is regarded as a synonym 

 of this species. But the name D. scobinula was applied by Haime 

 and subsequent authors to a form which does not appear to me to 

 be the same as that to which Michelin gave it, but to a form of 

 D. davidsoni. 



