294 Dr. J. W. Gregory — A Revision 



Diagnosis. — Zoarium of thick massive branches or irregu- 

 larly lobed masses. 



Zooecia very long ; walls thin. 



Diaphragms numerous near distal end. Apertures irregu- 

 lar. No acanthopores. 



Distribution. — England : Inferior Oolite and Great Oolite. 

 Foreign : Bajocian, Germany ; Bathonian, France. 



Family Heterotrypidae, Ulrich. 



Diagnosis. — Trepostomata in which the zooecia are simple, 

 prismatic, or cylindrical, with a well-marked divisional line 

 between the walls of adjacent zooecia. Mesopores present. 

 Diaphragms numerous and horizontal. Neither cystiphragms 

 nor inter-zocecial vesicles present. 



Genus Heteropora, Blainville, 1834. 



Diagnosis. — Heterotrypidge with prismatic or subcylin- 

 drical zooecia. Mesopores numerous. Acanthopores absent. 

 Walls of zooecia thin. Diaphragms horizontal, numerous. 

 Zoarium branching or massive. 



Type species: II. cryptopora (Goldfuss), 1829. 



1. Heteropora conifera (Lamouroux), 1821. 



Millejmra conifera, Lamouroux, 1821, Expos, m^th. p. 87, pi. Ixxxiii. 



tigs. 6, 7. 

 Heteropora conifera, M.-Edwards, 1836, in Lamarck, Hist. Nat. A.nim. 



ed. 2, t. ii. p. 308. 

 Cei-iopora conifera, Michelin, 1846, Icon. Zooph. p. 245, pi. Ivii. fig. 8. 

 Multicrescis conifera, d'Orbigny, 1852, Pal. fran9., Terr, cri^t. t. v. 



p. 1074. 

 Millepora dmnetosa, Lamouroux, 1821, oj). cit. p. 87, pi. Ixxxii. 



figs. 7, 8. 

 Spiropora dumetosa, Defrauce, 1827, Diet. Sci. nat. t. 1. p. 300. 

 Cricopora dmnetosa, Blainville, 1830, ihid. t. Ix. p. 386. 

 Heteropora dumetosa, M.-Edwards, 1836, op. cit. t. ii. p. 308. 

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

 Crescis dumetosa, d'Orbigny, 1852, op. cit. t. v. p. 1072. 

 Millepora pyri-'^ormis, Lamouroux, 1821, op. cit. p. 87, pi. ixxxiii. fig. 5. 

 Heteropora pyriformis, Michelin, 1846, op. cit. p. 244, pi. Ivii. fig. 3. 

 Polytrema pyriformis, d'Orbigny, 1849, Prod. Pal. t. i. p. 323. 

 Mtilticrescis pyriformis, d'Orbignj", 1852, op. cit. t. v. p. 1074. 

 Heteropora ramosa (non M. ramosa, Fleming), Michelin, 1846, op. cit. 



p. 244, pi. Ivii. fig. 4. 

 Ceriopora ramosa, d'Orbigny, 1849, op. cit. t. i. p. 323. 

 Millepora ramosa, Fleming, 1828, Brit. Anim. p. 529. 

 Heteropora reticulata, Haime, 1854, M(5m. Soc. g^ol. France, s^r. 2, 

 t. V. p. 211, pi. ix. fig. 9. 



