106 



and Sphenotrochus excisus, which I removed into the genus Deltocyathus. 

 In this paper I also gave a list of all the Australian Tertiary species, 

 but from which list was inadvertently omitted Sphenotrochus emarciatut, 

 Aniillia lens, Duncan, and Placotrochus elegans, nobis. 



MADEPOEAEIA APOEOSA. 



Family TuRBiNOLiDiE. — Group TrochocyathacejE. 



Genus Deltocyathus, M. Edw. and Haime (1848). 



Deltocyathus , M. Edw. and Haime, 1848. Corallum simple conical 

 free, no trace of adherence ; calice nearly circular and shallow ; columella, 

 ending in a rounded multipartite surface ; septa straight, large exsert and 

 granular, and the higher orders generally well developed ; pali, highly 

 developed, unequal, penultimate largest and turned towards ante- 

 penultimate so as to form chevrons or deltas ; costae, highly developed 

 distinct to the base, with many granulations. 



Deltocyathus italicus (Edw. Sf Haime), was formerly the only 

 species of this coral known. Messrs. Edw. and H. separated it from 

 Stephanophyllia in which genus it had been placed by Michelin 

 (Iconographie zoophytdoyique, Decrip. of polyp, fossil of France, &c, 

 1841-1847, p. 32, pi. 8, fig. 3, a young specimen). But Stephanophyllia has 

 porous walls, and therefore is very far removed from the family in which the 

 species has to be included. It must, however, be remarked that there 

 are certain pits in the intercostal spaces, which look very much like pores. 

 M. Edwards and Haime describe it thus : — Corallum, a short cone; 

 costs unequal, formed of a series of very regular globules ; columella con> 

 posed of three bundles of stems disposed in series ; four complete cycles ; 

 septa very little exsert, thick on the outside ; pali very unequal, thick. 

 Professor Duncan is of opinion that the specimens found by Mr. de Pour- 

 tales in the Caribbean Sea did not differ much from the Miocene 

 fossils of Europe, or these again from those found at Cape Otway. At 

 least he says that the differences are not greater than are to be found 

 between external divergencies in the fossil forms. The specimens from 

 Aldinga differ very much, first of all in the size. They are longer than 

 any of the dimensions given. They differ again in the shape. Some are 

 perfectly hemispherical, some are truncated cones, and some bell-shaped. 

 But I cannot doubt that I am dealing with a very closely allied species. 

 In one important point it seems to me to differ, and that is that there is 

 no columella. The septa all unite in the centre by numerous processes, 



