126 EOCENE AND LOWER OLIGOCENE CORAL FAUNAS. 



undulatious, and also some small dentations. One crown of pali before 

 the second cycle of septa, Calicular fossse very deep. No columella. 

 Internal cavity of corallites not filling up. No dissepiments were seen. 



After repeated attempts to place this coral in one of the recognized 

 Oculinid genera, I have decided that it is necessary' to make a new generic 

 designation for it. The genera of Oculinidse, with dichotomous budding, 

 and calices arranged in two opposite rows, are Neohelia' Moseley, Lopho- 

 helia^ M.-Edw. and H., Ampliihelia- :M.-Edw. and H., Enallohelia= d'Orb., 

 Euheha- M.-Edw. and H., Acrohelia- M.-Edw. and H., Cyathohelia- M.-Edw. 

 and H., Bathelia^ Moseley, and Tiarodendron** Quenstedt. 



Tiarodendron has large calices and large prominent costa^, so it can be 

 dropped from consideration at once. The following genera have no pali, so 

 they can not be further considei'ed: Neohelia, Lophohelia, Diplohelia, and 

 Acrohelia.^ I do not know whether Enallohelia and Euhelia possess them. 

 The former has a styliform columella and the latter turbinate corallites with 

 a rudimentary columella. Only Cyathohelia and Bathelia remain. The 

 former has septa with jjrominent (exsert) margins, and both have well- 

 developed columellje. From this resume of the points of difference between 

 Coelohelia and the other Oculiuids possessing the same mode of growth, it 

 will be evident that this is a very distinct genus. According to Duncan's 

 classification of the ( )culinidae, it belongs in the alliance Oculinoidea, and 

 seems to stand nearest Bathelia. The last-mentioned genus has deep, 

 widely-open calices, with four cycles of septa and a single crown of pali. 

 The columella is large and composed of numerous trabecular. The differ- 

 ence between Coelohelia and Bathelia ^ is thus narrowed down to the latter 

 possessing a well-developed columella, while the former does not. 



In the following specific description some of the characters stated in 

 the generic description are repeated. 



'Moseley, Deep sea corals: Challeuger Reports, pp. 176 and 177. 



^Duucan, Revisiou Geuera Madreporaria : Journ. Limi. Soc., Loudon, Vol. XVIU, 1884, pp. 37-44. 



^Quenstedt, Eiihren- uud Sterukoralleu, p. 739-741, pi. clxxii, (if;8. 1-10, 



■•Milne-Edwards and Haime, Hist. Nat. des Corall., Vol. II, p. 120. 



* Duncan, op. cit., p. 44. 



