36 
PEOBOSCINA. 
Affinities. 
The zoarium of this variety is less Stomatoporiform than the rest 
of the series ; the branches are hiserial and triserial. The roughness 
of the zoarium, owing to the projection of the peristomes, is a con- 
spicuous feature of the variety. 
LIST OF SPECIMENS. 
60,538. A somewhat weathered zoarium, encrusting a shell fragment. Lower 
Greensand. Farringdon, Berks. Cunnington Coll. Figd. PI. II. 
Fig. 8. 
D. 4504. With Idmonea hagenoivi (Sharpe), on chert pebble. Lower Greensand. 
Farringdon. Cunnington Coll. 
D. 5150. Two specimens, encrusting chert pebbles. Lower Greensand. 
Farringdon. Cunnington Coll. 
D. 5151. A zoarium encrusting a chert pebble (on slide). Lower Greensand. 
Farringdon. Cunnington Coll. 
c. Proboscina crassa (P6m.), var. francorum 
(Pergens), 1890. 
Synonymy. 
Stomatopora francorum, Pergens, 1890. Revision, p. 330. 
Idmonea fasciculata, pars, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 265. 
,, ,, d’Orbigny, 1851. Bry. Cret. pi. 634, figs. 10-13. 
Trobosc'ma ,, {ex. syn.), d’Orbigny, 1854. Ibid. p. 857. 
Alecto gracilis, pars {non Edw.), Lonsdale, 1850. In Dixon’s Geol. Suss. 
pi. xviii. A, fig. 1*, Ic {non figs, la, b). 
Vaeietal Characters. 
Zoarium of narrow bands, which in the main are regularly 
biserial. The walls are coarsely wrinkled. 
Peristomes high and prominent, with large apertures. 
Dimensions. 
D’Orbigny’s type 
{fide Pergens). 
Length of zooecia ? 
Diameter of zooecia *12 mm. 
Diameter of aperture ... *04 ,, 
Distribution. 
British : 
Middle Chalk : Chatham. 
Zone of Micraster oortestudinarium : Sussex. 
B.M. 
D. 3844. 
■5-* 8 mm. 
•25 „ 
•18 
