10 PEOF. P. MABTIN DTTNCAN'b RETISIOIf OF THE 



The generic cliaracters of Smilotrochus, according to Milne- 

 Edwarda and Jules Haime, were too specific. The shape of the 

 corallum and the nature of the ornamentation are most variable 

 quantities. The genus includes the simplest corals, and the 

 corallite consists of a wall, costse, and septa only ; sometimes 

 there is an epitheca. 



Genus Smilotrochtjs, Milne-Edwards Sf Jules Saime, 

 Hist. JVat. des Gorall. vol. ii. p. 70 (1857), amended. 



The corallum is simple, free in adult age, very variable in 

 shape, base small ; body straight or curved, cylindrical or conical, 

 or cuneiform, or turbinate, compressed or not. Septa slightly 

 exsert and free at their inner edge. Axial space vacant, there 

 being no columella. Costse well developed, not cristate. Epi- 

 theca usually does not exist. 



Distrihution. — Fossil. Cretaceous : England and Europe. 

 Eocene : Europe, Asia. Cainozoic : Australia. 



Subgenus Blagboyia, Duncan. 



The corallum is turbinate or subturbinate, adherent ; the 

 calicular fossa is very deep ; the costsa are covered with an epi- 

 theca, and the septa are very numerous. 



Distribution. — Fossil. Eocene of Sind. 



This subgenus absorbs the genus Blagrovia, nobis, Pal. Ind. 

 ser. siv., Foss. Corals and Alcyonaria of Sind, p. 28 (1880). 



Genus Onchoteochfs, Duncan, Monog. Brit. Fossil Corals, 

 Pal. Soc. part ii. n. 1, p. 4. 



The corallum is simple, adherent when young, free when 

 adult, tall, slender, tubuliform, straight or hooked, or clavate. 

 The septa are few in number, and some unite axially. The costsB 

 are small and almost rudimentary. The epitheca is pellicular and 

 striated. There is no columella. 



Distrihution. — Fossil. Cambridge Upper Greensand : Grey 

 and White Chalk, England. 



exist in corals otherwise exceedingly closely allied, and do not appear to be of 

 physiological importance), the subfamily Oaryophyllinse of Milne-Edwards and 

 Jules Haime is absorbed and abolished. 



About 67 genera have beeta arranged in this family. On revising them I find 

 it necessary to reduce to subgenera or abolish 25, so that this family now 

 consists of 42 genera. 



