of the British Jurassic Bryozoa. 291 



Diagnosis. — A thick incrustation ; the surface is covered 

 by numerous irregular ridges, the width of which usually 

 contains two or three apertures. The depressions between 

 the ridges are deep and usually as wide or a little wider than 

 the ridges. 



Distribution. — England : Inferior Oolite. Foreign : Ba- 

 thonian, France. 



Suborder Dactyletheata. 



Diagnosis. — Cyclostomata in which the normal zooecia are 

 elongate simple tubes of the same general character as those 

 of the Tubuliporidee. Dimorphism occurs, and the zoarium 

 consists of normal zooecia separated by numerous dactylethra?, 

 which often form the major part of the zoarium. 



Zoarium usually large and complex. 



Fam. Clausidse, d'Orbigny (emended). 



Diagnosis. — Cyclostomata Dactylethrata in which the 

 zoarium is arborescent. The zooecia open on all sides of the 

 zoarium. The dactylethrae are collected into zones or are 

 scattered regularly or irregularly among the zooecia. 



Genus 1. Multiclausa, d'Orbigny, 1852. 



Diagnosis. — Clausidse in which the zoarium consists of 

 stout branches, cylindrical or pyriform, and in which the 

 zooecia are distributed throughout the zoarium, and not 

 collected into zones or groups. The apertures occur either 

 regularly or irregularly. 



Type species : 31. compressa, d'Orbigny, 1852. 



1. Multiclausa Hairnet, nom. nov. 



Berenicea lucensis, Haime, 1854, Bry. Jur., Mem. Soc. g<Sol. France, 



se"r. 2, t. v. p. 180, pi. vii. fig. 4. 

 Berenicea (Multisjxirsa) lucensis, pars (Haime, non d'Orb.), Brauns, 



1879, Bry. mitt. Jura, Metz, Zeit. deut. geol. Ges. Bd. xxxi. p. 328. 

 Diastopora lucensis, pars (Haime, non d'Orb.), Reuss, 18(37, Bry. 



braun. Jura Balin, Denks. k. Akad. Wiss. Wien, Bd. cxxvii. p. 9. 

 Non Bidiastopora luciana, d'Orbigny, 1849, Prod. Pal. t. i. p. 317. 

 Non Multisparsa luceana, d'Orbigny, 1852, Pal. franc., Terr. cr<5t. t. v. 



p. 870, pi. 761. figs. 1-3. 

 Diastopora diluviana, pars, M.-Edwards, 1838, Mem. Cris., Ann. Sci. nat. 



Zool. ser. 2, t. ix. p. 228, pi. xiv. fig. 4. 



Diagnosis. — Zoarium branching repeatedly and irregu- 

 larly, and sometimes anastomosing ; branches stout. 



