BERENICE A. 93 



A form which appears to me to be prohahly a synonym of this 

 species is Diastopora spatiosa, Waif. 1 It has the irregularly raised 

 peristomes, wrinkled front walls, and flabellate arrangement of 

 the zocecia characteristic of the young zoarium of B. diluviana. 



This species differs from B. boloniensis (Sauv.) by having longer 

 zooscia, less crowded and less regularly arranged peristomes ; from 

 B. parvitubulata, Greg., by the greater diameter of the zooecia ; 

 and from B. archiaci, Haime, by the form of the zoarium and the 

 shape of the ooacia. 



Its nearest Cretaceous ally is B. gracilis (M. Edw.), 2 which 

 appears to differ only in having a smaller and more regular 

 zoarium. But this character is so unimportant that the Cretaceous 

 species ought probably to be reckoned as a variety. It is not here 

 formally included in B. diluviana, for I have not seen any Cre- 

 taceous specimens of B. gracilis, in which the zoaria completely 

 swamp the shells on which they grow, as the Jurassic specimens 

 often do. 



B. foliacea (Reuss), 3 from the Austrian Miocene, may be a 

 Tertiary representative of this type ; but Manzoni's figures suggest 

 that this species may belong to Tubulipora, in which Reuss origin- 

 ally placed it. The greater elevation of the peristomes enables it 

 to be readily distinguished from B. diluviana. 



LIST OF SPECIMENS. 

 BRITISH : 



D. 928, D. 929, D. 930. On Nucleolites orbicularis (Phil.). Cornbrash. 



Thrapston. Vine Coll. 

 D. 937. Qn. Nucleolites orbicular is (?}i\\.} . Cornbrash. Thrapston. Vine Coll. 



Young specimen. 

 B. 4846. On Terebratula intermedia, J. Sow. Cornbrash. Rushden. Young 



specimen. Figd. PI. II. Fig. 6. 

 B. 4251. On Terebratula maxillata, J. de C. Sow. Bradford Clay. Box 



Tunnel. Figd. PI. IV. Fig. 4. 



1 Walford. Bry. Shipton Gorge, pt. i. : Quart. Journ. Geol. Soc. vol. xlv. 

 p. 573, pi. xvii. figs. 7, 8. 



2 M. Edwards. Recherches sur les Polypes : Ann. Sci. nat. Zool. ser. 2, 

 t. ix. 1838, p. 237, pi. xiv. fig. 3. Also D'Orbigny, op. cit. p. 864, pi. DCXXXV. 

 figs. 10-13. 



3 A. E. Reuss. Foss. Polyp. Wien. Tert. : Naturw. Abh. Bd. ii. 1847, 

 p. 49, pi. vii. fig. 5. See also Manzoni, Brioz. foss. Mioc. Aust. Ungh. pt. iii. : 

 Denk. k. Akad. Wiss. Wien. Bd. xxxviii. Abth. 2, p. 13, pi. xii. fig. 47. 



