294 Dr. J. W. Gregory — A Revision 



Diagnosis. — Zoariurn of thick massive branches or irregu- 

 larly lobed masses. 



Zooscia 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-zooscial vesicles present. 



Genus Heteropora, Blainville, 1834. 



Diagnosis. — Heterotrypidse with prismatic or subcylin- 

 drical zocecia. Mesopores numerous. Acanthopores absent. 

 Walls of zocecia thin. Diaphragms horizontal, numerous. 

 Zoarium branching or massive. 



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



1. Heteropora conifera (Lamouroux), 1821. 



Millepora conifera, Lamouroux, 1821, Expos, meth. p. 87, pi. lxxxiii. 



tigs. 6, 7. 

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



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

 Ceriopora conifera, Michelin, 1846, Icon. Zooph. p. 245, pi. lvii. fig. 8. 

 Multicrescis conifera, d'Orbigny, 1852, Pal. franc., Terr. cret. t. v. 



p. 1074. 

 Millepora dumetosa, Lamouroux, 1821, op. cit. p. 87, pi. lxxxii. 



tigs. 7, 8. 

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

 Cricopora dumetosa, Blainville, 1830, ibid. t. lx. p. 386. 

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

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

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

 Millepora pyri^ormis, Lamouroux, 1821, op. cit. p. 87, pi. lxxxiii. fig. 5. 

 Heteropora pyr if ormis, Michelin, 1846, op. cit. p. 244, pi. lvii. fig. 3. 

 Tolytrema piriformis, d'Orbigny, 1849, Prod. Pal. t. i. p. 323. 

 Multicrescis piriformis, d'Orbigny, 1852, op. cit. t. v. p. 1074. 

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



p. 244, pi. lvii. 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, M6m. Soc. geol. France, s6r. 2, 

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



