of the British Jurassic Bryozoa. 155 



Peristomes distant and well raised, irregularly distributed ; 

 zcoecia visible throughout their length. 



Formula.— I" 2" i 0. 



Distribution. — England : Inferior Oolite, near Leckhamp- 

 ton. Foreign : Bathonian and Callovian, France. 



6. Diastopora Lamourouxi, M.-Ed\v. 



Diastopora Lamourouxi, M.-Edwards, 18.38, Mem. Cris., Ann. Sci. 



nat. Zool. s6r. 2, t. ix. p. 225, pi. xv. fig. 2. 

 Diastopora foliacea, pars, Lamouroux, 1821, Expos. m6th. pi. lxxiii. 



tig. 3. 

 Diastopora Waltoni, Haime, 1854, Bry. Jur., Me'ni. Soc. g£ol. France, 



ser. 2, t. v. p. 184, pi. viii. figs. 2 a, b. 



Diagnosis. — Zoarium unilaminate, growing in irregular 

 tubes, which may branch repeatedly or broaden into tunnel- 

 shaped expansions. 



Zooecia usually visible throughout, the zooecia being long 

 and the apertures usually distant. 



Peristomes (in well-preserved specimens) highly raised and 

 irregular in distribution, though occasionally there is a 

 tendency towards a quincuncial system. Zooecia regularly 

 cylindrical. 



Formula.— 3 2/0. 



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

 jocian, Germany ; Bathonian, France and Austria. 



Synopsis of Species. 



I. Zocecia cylindrical. 



A. Zoarium bilaminate. 



a. Zooecia visible throughout. 

 Zoarium frondose : 



peristomes -well raised and their distribution 



irregular foliacea. 



peristomes slightly raised and their distribution 



subregular Davidsoni, 



Zoarium ribbon-shaped : 



peristomes raised and their distribution irre- 

 gular calloviensis, 



b. Zocecia visible at ends Michelini. 



B. Zoarium unilaminate Lamourouxi. 



II. Zocecia lozenge-shaped lamellosa. 



