DIASTOPORA. 129 



5. Diastopora calloviensis (D'Orbigny), 1852. 



SYNONYMY : 



Elea calloviensis, D'Orbigny, 1852, Pal. fran9. Terr. cret. t. v. p. 629. 

 Diastopora calloviensis, Haime, 1854, Bry. jurass. : Mem. Soc. geol. France, 



ser. 2, t. v. p. 191. 

 ,, ,, Gregory, 1896, Rev. pt. iv. : Ann. Mag. Nat. Hist. 



ser. 6, vol. xvii. p. 154. 



? ,, sulramosa, Waagen, 1868, Zone Amm. sowerbyi: Geogn. Pal. Beitr. 

 Bd. i. Ht. 3, p. 645, pi. xxxiii. fig. 8. 



DIAGNOSIS : 



Zoarium of loose tufts; composed of bands which branch 

 irregularly ; bilaminate. 



Zocecia long, broad, and regular in shape. Peristomes distant 

 and well raised ; irregularly distributed. Zooecia visible through- 

 out their length. 



Formula. p, c, I, r = l", 0, 2", 0. 



DISTRIBUTION. 



ENGLAND : 



Inferior Oolite : near Leckhampton. 

 FOREIGN : 



Bathonian: Ranville, Normandy. 



CaUovian: Gueret, Sarthe (fide D'Orbigny). 



Description of Figure. PL VII. Fig. 5. Part of a tufted 

 zoarium, x 13 dia. Bathonian Calcaire a polypiers : Ranville. 

 Tesson Coll. 60368. 



Affinities. This species is most closely allied to D. davidsoni, 

 Haime ; from this it differs by having higher peristomes and longer 

 zocecia, and by the irregular distribution of the peristomes. The 

 most conspicuous difference is that the zoarium consists of bands, 

 instead of fronds ; but, unless this were accompanied by zocecial 

 differences, I should not venture to regard it as entitling the form 

 to specific distinction. 



The zoarium resembles that described by Haime as D. ramos- 

 ^ss^ma, but the zooecial characters show the species are distinct, for 

 in Haime' s form the peristomes are regularly quincuncial, and the 

 zooecia lozenge-shaped. 



D'Orbigny' s diagnosis is very short, and was not accompanied 

 by any figure. Hence the species has generally been dismissed as 

 a doubtful record. The description, however, exactly represents 

 both the zoarial and zooecial characters of this species. 



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