480 



MR. G. R. VINE ON THE POLYZOA OF 



31. Heteropora (?), Blainville, sp. 



In fragments of Ked Chalk t-wo different species (?) of Polyzoa are 

 embedded, and I should hesitate to phice them anywhere except that 

 I have met with Heteropora tenera, in the Paringdon rock, having 

 characters as obscured as these until fragments were sectioned, 

 when their true character was revealed. 



Habitat. In pieces of lied Chalk. Fossils ^o. 30 ii. and No. 31. 



Horizon, lied Chalk, Hunstanton. 



§13. Rectangulata, Waters. 

 Genus Ceriopora, Goldfuss. 



1826. Cmo;)o^« (pars), Goldfuss; 1834. Elainville ; 1847. D'Or- 

 biguy ; 1852. Ceriojwra, Goldfuss, d'Orb. Terr. Cret. v. p. 1029. 



In establishing the genus Ceriopora, Goldfuss took for his type 

 Alveolites, Lamarck ; altogether Goldfuss described and admitted 

 in the group about 37 species. The group has since been very much 

 broken in upon by Blainville and others, and at the present time it 

 is impossible to accept the genus for any considerable number of 

 Polyzoa. D'Orbigny admits (Terr. Cret. p. 1030) the following 

 Cretaceous species as Cerioporoi: — 



1845. Ceriopora truncata, Mich. Icon. pi. 51. fig. 7. 



1830. Ceriopora tubiporacea, Goldf. Petrefact. pi. 10. fig. 13. 



1830. Ceriopora millep)oracea, Goldf. Petrefact. pi. 10. fig. 10. 



1830. Ceriopora micropora, Goldf. Petrefact. pi. 10. fig. 4. 



He also describes a new species from the Senonian stage as 

 Ceriopora dic/italis, d'Orb. I have only two examples of Ceriopora 

 from the Red Chalk, which I prefer to place in this genus rather 

 than in the Ceriocava, d'Orb. 



32. Ceriopora micropora (?), Goldf. 



1830. Ceriopora mia-opora, Goldf. Petrefact. p. 33, pi. 10. fig. 4. 



1852. Ceriopora micropora, d'Orb. Terr. Cret. v. p. 1030. 



1872. Ceriopora micropora, Simonowitsch, Bryoz. des Essen 

 Griiusands. 



The two examples, which I place here doubtfull}", are difficult 

 to separate, except by slight variation in their form. Cerioporce 

 are rare in the Ked Chalk, and the present specimens differ in the 

 characters of the cell-orifices, so much so that Dr. Pergens, who has 

 examined most of the Red-Chalk Polyzoa, made the following note 

 respecting them : — 



^' Cerioptora {Heteropora'^.), n. sp. : the orifices are 0-14-0'l() 

 millira." The forms seem to me, however, closely related to C. mi- 

 cropora, Goldf. 



Habitat. Embedded in fragments of Red Chalk. Fossils Nos. 34 

 and 35 (variety ?). 



Horizon. Red Chalk (middle bed *), Hunstanton ; 'Essen (Gold- 

 fuss). 



* The ranges in the several zones are shown in the Table at p. 4G0. 



