ENTALOPHORA. 139 



evidence of these occasional zooecia, then the two groups of species 

 must be united. But in the' Mesozoic faunas there are many 

 species in which all the zocecia are regularly hexagonal ; these are 

 so strikingly unlike the irregular tubular zooecia of Entalophora, 

 that the difference has been regarded as of family, or even of 

 ordinal, value. It seems unnecessary to ignore this great and 

 fairly constant difference owing to the occurrence of a few 

 abnormal zooecia. 



The name to be applied to this group of species with polygonal 

 zooecia must be either Pustulopora, Helicertites, or a new name. 

 The first was defined by Blainville 1 in 1830, and the second by 

 Homer 2 in 1841. Neither genus as given by these authors was 

 homogeneous. Blainville took as his type a specimen figured by 

 Goldfuss, of which the only determinable character is the annular 

 arrangement of the peristomes. The 1 other specimens figured by 

 Hagenow had hexagonal zocecia, and it is quite possible that 

 Goldfuss' type had the same. But as that cannot be discovered, 

 Pustulopora must stand as a synonym of the Spiropora group 

 of Entalophoridae. 



1. Entalophora cellarioid.es, Lamouroux, 1821. 



SYNONYMY : 

 Entalophora cellarioides, Lamouroux, 1821, Expos. Meth. p. 81, pi. Ixxx. 



figs. 9-11. 



,, ,, Bronn, 1825, Pflanzenth. p. 27, pi. vii. fig. 10. 



,, ,, Defrance, 1826, Diet. Sci. nat. t. xlii. p. 392. 



,, ,, Blainville, 1830, Diet. Sci. nat. t. Ix. p. 453. 



,, ,, Blainville, 1834, Man. Act. p. 489, pi. Ixxxii. fig. 1. 



,, ,, Bronn, 1837, Leth. Geogn. ed. 2, Bd. i. p. 243, 



pi. xvi. fig. 24. 



,, ,, Michelin, 1846, Icon. Zooph. p. 233, pi. Ivi. fig. 4. 



,, ,, Bronn, 1848, Nomencl. p. 462. 



,, ,, Bronn, 1849, Enum. p. 141. 



,, ,, D'Orbigny, 1849, Prod. Pal. t. i. p. 318. 



,, ,, Bronn, 1851, Leth. Geogn. ed. 3, Bd. ii. Th. 4, p. 87, 



pi. xvi. fig. 24. 



,, D'Orbigny, 1852, Pal. fran9. Terr. cret. t. v. p. 779. 



,, ,, Haime, 1854, Bry. jurass. : Mem. Soc. geol. France, 



ser. 2, t. v. p. 199, pi. ix. fig. 8. 



1 Diet. Sci. nat. t. Ix. p. 382. 



2 Verst. norddeut. Kreidegeb. p. 18. 



