BEEEXICEA. 
105 
DlilEXSIOXS. 
Length of zocecia 
Diameter of zocecia ... 
Diameter of aperture ... 
B.M., D. 2009. 
l'2-l'o mm. 
■3--4 , 
16 „ 
B.M., D. 2961. 
1 mm. 
•3-‘35 mm. 
Distribution. 
E^*GL.O^D : 
Upper Greensand : Cambridge. 
Red Chalk : Hunstanton. 
Foreign : 
Cenomanian: Kamajk, Kank, Jine, Yeliin, and Zbislav, Bohemia, 
in Korycaner Schichten ; Strehlen, Saxony, in Lower 
Planer. 
Figures. 
PI. lY. Pig. 8. The type of Tine’s Biastopora Tiagenowi (Ess.), 
encrusting a fragment of Radiolites mortoni. Upper Greensand : 
Cambridge. Jesson Coll. Fig. 8«, the zoarium, natural size; 
Fig. 85, the best preserved part of the zoarium, X 9 dia. D. 2961. 
PL lY. Fig. 9. The type-specimen of Biastopora hunstantonensis^ 
Yine. Eed Chalk : Hunstanton. Jesson Coll. Fig. 9«, the 
zoarium, natural size; Fig. 95, part of the zoarium, X 9 dia. 
D. 2009. 
Affinities and Synonyms. 
B. folium, Xovak, is an exceptionally Tvell -marked ‘species,’ 
characterized by its large, thin zoarium and its somewhat club- 
shaped zocecia. The form of the zocecia gives it some interest, 
for it is not of the simple, cylindrical type of ordinary 
Cyclostomata. The zocecia agree in shape more closely with the 
Palaeozoic Cryptostomata than with later ty^ies : the resemblance, 
however, is secondary and homoplastic. 
For the name of the species I have felt hound to accept that 
proposed by Professor Seeley in 1866; it is descriptive, and the 
diagnosis, though short, is recognizable. Seeley’s description has 
been overlooked by subsequent palaeontologists, and on the 
Continent the name of B. folium, Xovak, has been generally 
accepted. In addition to B. folium specimens must be referred to 
B. contractu, which have been divided under five other names. 
The Berenicea pilosa, Hov., has more regularly corrugated walls; 
hut in all essential characters it seems to he the same. One of 
