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RADIOPORID^. 
4. Thoiopora vinei (Gregory), 1909. 
Synonymy. 
Domopora polytaxis (Hag.) ?, Vine, 1885. Cambr. Greensd. : Proc. Yorks. 
Geol. Soc. vol. ix. p. 21. 
,, ,, ? Vme, 1889. Further on Cambr. Greensd. 
pt. ii. : ibid. vol. xi. pt. ii. pp. 258, 270. 
,, ,, ,, ? Vine, 1891. Rep. Cret. Polyz. : Rep. Brit. 
Assoc. 1890, p. 389. 
,, vinei, Gregory, 1909. New Cret. Bry. : Geol. Mag. dec. v. vol. vi. 
p. 66. 
Diagnosis. 
Zoarium small, of two or more stems arising from a circular 
base. The stems are sharply divided by transverse annular 
constrictions into several segments, which decrease in diameter 
towards the blunt apex. 
Apertures in vertical series, containing from two to five in each 
series. The apertures in the series are in places well raised 
above the general surface of the stem. 
Mesopores scarce. 
Dimensions. 
Height of zoarium 
mm. 
5 
Maximum diameter of stems ... 
2-3 
Maximum diameter of zoarium at ba.se 
4 
Diameter of apertures ... 
•15 
Distribution. 
Albian — Cambridge Greensand : Cambridge. 
Figures. 
PI. VII. Fig. 8. The type-specimen from the side ; X 5 dia. 
Cambridge Greensand : Cambridge. Vine Coll., No. 22. D. 1879. 
PI. VIII. Fig. 1. Part of the surface of another specimen, 
showing some of the raised apertures ; X 15 dia. Cambridge 
Greensand: Cambridge. D. 1881. 
Affinities. 
This species is based on two specimens from the Cambridge 
Greensand, doubtfully identified by Vine as the Ceriopora polytaxis 
of von Hagenow,^ which in its overlapping layers somewhat 
resembles a Thoiopora. The C. polytaxis, however, has not the 
vertical series of apertures and mesopores of Thoiopora. 
^ Von Hagenow. Bry. niaastr. Kr. 1851, p. 51, pi. v. fig. 2. 
