SPIEOPORA. 155 



6. Spiropora tetragona, Lamx., 1821. 



SYNONYMY : 



Spiropora tetragona, Lamouroux, 1821, Expos. Meth. p. 85, pi. Ixxxii. figs. 9, 10. 

 ,, ,, Haime, 1854, Bry. jurass. : Mem. Soc. geol. France, ser. 2, 



t. v. p. 197. 

 ,, ,, E. E. Deslongchamps, 1865, Jur. inf. Norm. : Mem. Soc. 



linn. Norm. t. xiv. p. 151. 

 ,, ,, Gregory, 1896, Eev. pt. v. : Ann. Mag. Nat. Hist, ser. 6, 



vol. xvii. p. 198. 



Cricopora ,, Blainville, 1830, Diet. Sci. nat. t. Ix. p. 386. 

 ,, ,, Blainville, 1834, Man. Act. p. 421. 



,, ,, M. Edwards, 1836, in Lamarck, Anim. s. Vert. ed. 2, t. ii. 



p. 453. 



,, ,, Michelin, 1846, Icon. Zooph. p. 235, pi. Iv. fig. 12. 



,, Bronn, 1848, Nomencl. p. 348. 



,, Bronn, 1849, Enum. p. 140. 



,, ,, Huxley and Etheridge, 1865, Cat. Foss. M.P.G. p. 223. 



Entalophora ,, D'Orbigny, 1849, Prod. Pal. t. i. p. 318. 



,, ,, D'Orbigny, 1852, Pal. fram?. Terr. cret. t. v. p. 779. 



Pictet, 1857, Traite Pal. ed. 2, t. iv. p. 134. 

 ,, ,, Vine, 1888, Polyz. Caen: Journ. Northptn. Nat. Hist. Soc. 



vol. v. p. 10. 



Spiropora tetraquetra, Lamouroux, 1821, op. cit. p. 47. 

 Cricopora ,, Bronn, 1837, Leth. Geogn. ed. 2, Bd. i. p. 247. 



,, ,, Bronn and Romer, 1851, Leth. Geogn. ed. 3, Bd. ii. 



Th. 4, p. 90. 

 non Bisidmonea tetragona (Lamx.), Walford, 1889, Bry. Shipton, pt. i. : Quart. 



Journ. Geol. Soc. vol. xlv. p. 571, pi. xix. figs. 7-9. 

 ,, antiqua, D'Orbigny, 1852, op. cit. p. 720, pi. Dcclxii. figs. 10-12. 



DIAGNOSIS : 



Zoarium composed of thick tetragonal stems, which dichotomize 

 repeatedly, but irregularly ; they form a loose tuft. 



Zocecia short. Peristomes slightly raised, arranged in alternate 

 horizontal series (as in Idmoned]. On each face of a stem there 

 occur two rows of apertures, placed alternately on the left and 

 right sides of the face. The distance between two rows on the 

 same side is of medium length. 



DISTRIBUTION. 



BRITISH : 



Inferior Oolite : ? Gloucestershire. 

 FOREIGN : 



Bathonian : Ranville ; Luc ; Lebisey ; Langrune. 



