BEKENICEA. 
99 
AFPryiTiEs. 
This ‘species’ was foimclecl by von Hagenow in 1839 on 
a specimen from the Belemyiitella mucronata Chalk of Riigen, and 
figured by him for a Maastrichtian specimen in 1851. It is 
characterized by its small thick, discoid zoarium, and its low, 
irregularly arranged peristomes. Unlike Berenicea polystoma, this 
‘ species ’ is thickest in the middle and thinnest at the margin. 
Among Jurassic Bryozoa it most nearly resembles the specimens 
of B. archiaci, Haime, which have no gonocysts ; ^ but the peristomes 
are lower, and the apertures less crowded. The same features 
separate it from B. verrucosa (Edw.). The best Tertiary repre- 
sentative of this form is B. rotula (Ess.),^ which is like a Berenicea 
disciformis surrounded by a peripheral selvage. 
LIST OE SPECIMEiS-S. 
D. 2988. A zoarium encrusting a fragment of Inoceramus. Chalk. Loc. ? 
Old Coll. Figd. PL YI. Fig. 2. 
D. 2061. A zoarium 8 mm. in dia., encrusting Roplites solenonotus (Seel.). 
Eed Chalk. Hunstanton. Tine Coll. 
D. 2362. A small zoarium. Red Chalk. Ilnnstanton. Jesson Coll. 
D. 2034. A zoarium on a piece of chalk. Red Chalk. Hunstanton. Jesson 
Coll. Recorded by Vine as Riastopora foecunda, Vine : Quart. 
Journ. Geol. Soc. vol. xlvi. p. 476. 
D. 2036. Kzoiixmm Terehrahilabiplicata. Red Chalk. Hunstanton. 
Jesson Coll. Recorded as Riastopora radians, Hov. ? by Vine : 
ibid. p. 477, Ho. 26. 
D. 3932. Two young zoaria encrusting a fragment of Micr aster, sp. (on slide). 
Middle Chalk. Chatham. Gamble Coll. 
? D. 3003. A large zoarium encrusting a fragment of Mieraster, sp. (on slide). 
Middle Chalk. Chatham. Gamble Coll. 
D. 443. A young unworn zoarium encrusting a shell fragment (on slide). 
Middle Chalk. Chatham. Gamble Coll. 
D. 2971. A young zoarium encrusting a fragment of Rchinocorys, sp., with 
(Edw.), on slide. Upper Chalk. S.E. England. 
Toulmin Smith Coll. 
^ E.g. Cat. Jur. Rry. pi. iv. fig. 3. 
2 Riastopora rotula, von Reuss. Foss. Polyp. 'VVien. Tert. : Haturw. Abh. 
vol. ii. p. 51, pi. vii. fig. 8. 
