BEKENICEA. 87 



high, reflexed peristomal portions of the zocecia are sufficient to 

 characterize it. It corresponds to D. foliacea in the Diastopora 

 series, and to S. dichotoma (Larax.) in that of Stomatopora. 



Mr. Walford has also described a Diastopora spatiosa and 

 a Proloscina spatiosa, and it is not altogether clear whether he 

 regards these as three species belonging to three different genera, 

 or as one species, which, nevertheless, belongs to three different 

 genera. The D. spatiosa and the P. spatiosa are both referred to 

 Proboscina. 



An allied species is Berenicea megapora (D'Orb.), 1 which agrees 

 with this in consisting of an irregular sheet, and having highly raised 

 peristomes. The Cretaceous species, however, has the peristomes 

 far more raised, while they are more crowded. The Cainozoic 

 species which most resembles the present is B. flabellum (Reuss), 3 

 from the Leithakalk of Austria ; but in that species the peristomes 

 are less raised, and the zoarium is regularly flabelliform. 



The three species can be compared by their formulae as follows: 



spatiosa 312 iO. 



megapora 3* 1 1 i'2. 



flabellum Ill iO. 



LIST OF SPECIMENS. 



D. 2174. Bradford Clay. Bradford. Brodie Coll. 



D. 30. Great Oolite. Hampton, near Bath. Holl Coll. Figd. PI. III. 



Fig. 1. 

 D. 209, D. 1908, D. 1922, D. 1923, D. 1924. Great Oolite. Richmond boring, 



1205ft. Presented by Professor J. W. Judd, F.R.S. The 



D. diluviana of Vine. 

 D. 1918, D. 1920. Great Oolite. Richmond boring, 1205 ft. Presented by 



Professor J. W. Judd, F.R.S. The D. microstoma of Vine. 

 D. 1921, D. 1925. Great Oolite. Richmond boring, 1205 ft. Presented by 



Professor J. W. Judd, F.R.S. The D. lamourouxi of Vine. 

 D. 2195. Inferior Oolite. Near Leckhampton. Brodie Coll. 

 D. 2085, D. 2089. On annelid tubes. Bathonian Calcaire a polypiers. 



Ranville. 

 B. 4524. On Dictyothyris coarctata (Park.). Bathonian Calcaire a polypiers. 



Ranville. 



D. 2218. Bathonian Calcaire a polypiers. Ranville. Tesson Coll. 

 D. 2090. Braun Jura, 8. Eisenoolith. Dettingen. 



1 D'Orbigny. Pal. fran9- Terr. cret. t. v. p. 863, pi. DCXXXV. figs. 4, 5. 



2 Reuss. Foss. Polyp. Wien. Tert. : Naturw. Abh, Bd. ii. 1847, p. 51, 

 pi. vii. fig. 9. 



