BERENICEA. 91 



Diastopora diluviana, Phillips, 1571, Geol. Oxford, pp. 239, 302, pi. xi. figs. 



22-3 ; pi. xii. fig. 2 (figs, indet.). 

 Vine, 1883, 3rd Rep. Foss. Polyz. : Rep. rit. Assoc. 1882, 



pp. 256, 264. 



,, ,, Vine, 1884, 4th Rep. Foss. Polyz. : ibid. p. 187. 



,, ,, pars, Vine, 1884, Polyz. Richmond boring: Quart. Journ. 



GeoL Soe. vol. xl. p. 787. 

 ,, ,, Vine, 1887, Jur. Polyz. Northptn. : Journ. Northptn. Nat. 



Hist. Field Club, vol. iv. p. 206, pi. i. figs. 12-16. 

 ,, ,, Vine, 1888, Polyz. Caen : ibid. vol. v. p. 13. 



,, ,, Thompson, 1889, Mid. Lias Northamptonshire, p. 59. 



,, ,, Fox-Strangways, 1892, Jur. Rks. Britain, vol. ii. : Yorks. 



Tables of Fossils, pp. 148, 200. 

 Reptomultisparsa diluviana, D'Orbigny, 1852, Pal. franq. Terr. eret. t. v. p. 876. 



diluviana, Pictet, 1857, Traite Pal. ed. 2, t. iv. p. 138. 

 Rosacilla ,, Sauvage, 1889, Bry. jur. Boul. : Bull. Soc. geol. France, 



ser. 3, t. xvii. p. 44, pi. iv. fig. 11. 



Diastopora spatiosa, Walford, 1889, Bry. Shipton, pt. i. : Quart. Journ. Geol. 

 Soc. vol. xlv. p. 573, pi. xvii. figs. 7, 8. 



DIAGNOSIS : 



Zoarium in large, irregular, encrusting sheets. Young forms 

 are flabelliform. 



Zocecia of medium length, cylindrical. Young central zocecia 

 visible throughout; the more adult, peripheral zocecia are crowded, 

 and thus not wholly seen. 1 Front wall plain, or crossed by faint, 

 transverse ridges, best seen in young zoaria. 



Peristomes slightly raised in peripheral zooecia; central ones 

 almost flush. Irregularly distributed ; but in large zoaria they 

 are in places sub-linear. 



Gonocysts pyriform ; rather narrow ; usually but slightly broader 

 than the zooecia. 



Formula. p, c, I, r = 1-1", 0, 2, iQ. 



DISTRIBUTION. 



ENGLAND : 



Lower Calcareous Grit : Yorkshire (fide Hudleston) . 

 Oxford Clay : St. Clements (fide Phillips). 

 Cornbrash : Rushden and Thrapston ; Islip (fide Phillips) ; and Yorkshire (fide 



Fox-Strangways) . 

 Bradford Clay : Bradford ; Box ; Corsham. 



1 Reuss' two figures (Reuss, op. cit. \b and 2a) well show the difference 

 between the central and crowded peripheral portions of the zoarium. 



