CEKIOCAVA. 163 



with short zocecia and abundant diaphragms, and is here placed 

 among the Trepostomata. 



Microscopic study of the branching forms shows that they are 

 of much the same type as the thicker species of Entalophora and 

 Spiropora. Comparison of Fig. 10 with Fig. 13 shows that the 

 zocecia are fundamentally the same, and are arranged on the same 

 plan. Hence these massive branching forms must be included 

 in the Entalophoridse. Their thick, irregularly branching habit 

 enables them to be readily separated from either Entalophora or 

 Spiropora, even when the external layer and the peristomes are 

 not shown. 



The genus differs from Entalophora, as in the latter there is no 

 separation into a central axis of narrow tubes, and a peripheral 

 zone of broader tubes. 



1. Ceriocava corymbosa (Lamouroux), 1821. 



Mittepora corymbosa, Lamouroux, 1821, Expos. Meth. p. 87, pi. Ixxxiii. figs. 8, 9. 

 non Ceriopora ,, Michelin, 1846, Icon. Zooph. p. 246, pi. Ivii. fig. 9. 

 non ,, ,, Bronn, 1848, Nomencl. p. 261. 

 non ,, ,, Bronn, 1849, Enum. p. 143. 



D'Orbigny, 1849, Prod. Pal. t. i. p. 323. 

 Ceriocava D'Orbigny, 1852, Pal. franQ. Terr. cret. t. v. p. 1016. 

 ,, Pictet, 1857, Traite Pal. ed. 2, t. iv. p. 157. 



,, ,, Gregory, 1896, Rev. pt. v. : Ann. Mag. Nat. Hist. ser. 6, 



vol. xvii. p. 200. 

 Heteropora ,, Haime, 1854, Bry. jurass. : Mem. Soc. geol. France, ser. 2, 



t. v. p. 212. 



Ceriopora neptuni, D'Orbigny, 1849, op. cit. p. 324. 

 Ceriocava D'Orbigny, 1852, op. cit. p. 1016. 



Ceriopora conifera (non Lamx.), Micbelin, 1846, op. cit. p. 245, pi. Ivii. fig. 8. 

 ,, ,, (non Lamx.), Bronn, 1848, Nomencl. p. 261. 



,, ,, (non Lamx.), Bronn, 1849, Enum. p. 143. 



,, dumetosa, Michelin, 1846, op. cit. p. 245, pi. Ivii. fig. 7. 

 ,, ,, Bronn, 1848, Nomencl. p. 261. 



,, Bronn, 1849, Enum. p. 143. 



D'Orbigny, 1849, Prod. Pal. t. i. p. 323. 

 Cava D'Orbigny, 1852, op. cit. t. v. p. 1019. 



,, Pictet, 1857, op. cit. p. 157. 



Ceriopora pustulosa, Michelin, 1846, Icon. Zooph. p. 245, pi. Ivii. fig. 6. 



,, M'Coy, 1848, New Mesoz. Rad. : Ann. Mag. Nat. Hist. 



ser. 2, vol. ii. p. 418. 



,, ,, Bronn, 1848, Nomencl. p. 143. 



,, Bronn, 1849, Enum. p. 261. 



