of the British Jurassic Bnjozoa. 155 



Peristomes distant and well raised, irregularly distributed j 

 zccecia visible throughout their length. 



Formula.— I" 2'' i 0. 



Distribution. — England : Inferior Oolite, near Leckhamp- 

 ton. Foreign : Bathonian and Callovian, France. 



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



Diastopora Lamouroiixi, M.-Edwards, 1838, M6111. Cris., Ann. Sci. 



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

 Diastopora foliacea, pars, Lauiuiiroux, 1821, Expos, mdth. pi. Ixxiii. 



tig. 3. 

 Diastopora Waltoni, IJaiaie, 1854, Bry. Jur,, M^in. Soc. geol. France, 



8^r. 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. Zooecia cylindrical. 



A. Zoarium bilaminate. 



a. Zooecia visible throughout. 

 Zoarium fiondose : 



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. Zooecia visible at ends Michelini. 



B. Zoarium unilaminate Lamourouxi. 



II. Zocecia lozenge-shaped lamellosa. 



