PROBOSCINA. 61 



Proboscina davidsoni, Haime, 1854, op. cit. p. 167, pi. vi. fig. 11. 

 ,, ,, Pictet, 1857, op. cit. p. 144. 



,, ,, Vine, 1883, op. cit. p. 264. 



,, ,, Woods, 1891, Cat. Type Foss. Cambridge, p. 48. 



Proboscina buchi, Haime, 1854, op. cit. p. 168, pi. vi. fig. 10. 

 ,, ,, Pictet, 1857, op. cit. p. 144. 



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



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

 ,, ,, Terquem and Jourdy, 1871, Et. Bath. Moselle : Mem. Soc. 



geol. France, ser. 2, t. ix. p. 156. 

 ,, ,, Vine, 1883, op. cit. p. 264. 



Stomatopora (P.) davidsoni, Vine, 1884, 4th Eep. Foss. Polyz. : Eep. Brit. 

 Assoc. 1883, p. 186. 



DIAGNOSIS : 



Zoarium formed of fairly regular, anastomosing bands, composed 

 usually of from four to six zoo3cia. Each branch in section appears 

 as a rounded ridge. 



Zocecia regularly cylindrical. 



Peristomes usually in regular transverse lines, slightly raised. 

 Zooecia of medium length. 



Formula. p, c, I, r = 1, 0, 2, 4-7. 1 



DISTRIBUTION. 



BRITISH : 



Great Oolite : Hampton, near Bath (Cambridge Museum) . 

 Inferior Oolite Pea Grit : Gloucestershire. 



FOREIGN : 



Bathonian : Luc ; Ranville, in Calvados. 



Zone of Cosmoceras subfurcatum : Longwy (fide Terquem). 

 Bajocian: Ars-sur- Moselle ; Lothringen (fide Friren). 



Description of Figure. PI. II. Fig. 1. Part of a zoarium, 

 X 20 dia. Inferior Oolite : Gloucestershire. Holl Coll. D. 1843. 



Affinities. This species is represented by the formula p, c, I, r 

 = 1, 0, 2, 4-7. It is well characterized by its regularity, both 

 in the arrangement of the peristomes and the branching of the 

 zoarium. The two forms P. davidsoni and P. buchi seem to 

 me unquestionably identical, the differences between them being 



1 r in the formulae for Proboscina indicates the number of zocecia in the width 

 of the branches. 



