A Rev is ion of the British Jurassic Bryozoa. 151 



XXI. — A Revision of the British Jurassic Bryozoa. — Part IY\ 

 The Genera Reptomultisparsa and Diastopora. By J. W. 

 Gregoey, D.Sc, F.G.S. 



[Continued from p. 48.] 



Family Tubuliporidse (concluded). 

 Genus Reptomultisparsa, d'Obigny, 1852. 



Diagnosis. — Tubuliporidae in which the zoarium is en- 

 crusting and consists of thick multilamellar sheets. The 

 zooecia are cylindrical and parallel to the surface upon which 

 the zoarium has grown. The peristome is flush or slightly 

 raised. 



Type species : R. microstoma (Mich.), syn. R. diluviana, 

 Edw. & Mich, (non Lamx.). 



Affinities. — This genus was founded by d'Orbigny for thick 

 multilamellar species allied to Berenicea. The division seems 

 to me convenient. The first of the five species referred to the 

 genus by d'Orbigny, which is accordingly here taken as the 

 type, is the Diastopora diluviana, Edw. & Mich, (non Lamx.). 

 This, however, I regard as the same as Michelin's Diastopora 

 microstoma. 



1. Reptomultisparsa undulata (Michelin), 1846. 



Diastopora undulata, Michelin, 1846, Icon. Zooph. p. 242, pi. hi. 



fig. 15. 

 Berenicea undulata, d'Orbigny, 1852, Pal. franc., Terr. cret. t. v. p. 860. 

 Berenicea microstoma (non Mich.), Haiine, 1854, Bry. Jur., Mem. Soc. 



ge"ol. France, ser. 2, t. v. p. 178, pi. vii. fig. 3. 

 Diastopora microstoma, var. connectens, Vine, 1884, Polyz. Rich. Bor., 



Quart. Journ. Geol. Soc. vol. xl. p. 789. 



Diagnosis. — Zoarium in large, thick, irregular encrusting 

 sheets, which in the adult completely bury the shell they 

 encrust. Young forms are flabelliform. 



Zooecia long or medium in length. Young zooecia are seen 

 throughout. The more adult peripheral zooecia are crowded, 

 and thus not wholly seen. Surface traversed by sinuous 

 raised ridges. 



Peristomes slightly raised, irregularly distributed. 



Formula.— 1/1" 2 i 0. 



Distribution. — England : Great Oolite, Richmond boring, 

 Bradford Clay, Bradford. Foreign : Bajocian and Bathonian, 

 France and Germany. 



