546 M. F. Tomes — 8ome Cretaceous Madreporaria. 



own coUectioa from Haldon diflfer in the important respect of some- 

 times bavino- a styliform columella, and sometimes only a ring of 

 pali, as in Prof. Duncan's figures. 



The very dwarfed individuals representing the two species of 

 Barysmilia from Haldon are apparently in exact accordance with the 

 small and incrustiug ThamnastrcecB from the same locality. 



Genus Pleukosmilia, E. de From. Bull, de la Soc. Geol. de France, 

 2nd ser. t. xiii. p. 853, 1856. 



The generic name Pleiirosmilia was first made use of in 1856 by 

 M. de Fromentel for a group of simple corals having an elongated 

 and essential columella, one end of which is united to one of the 

 principal septa, and the other end is free.^ The specimens on which 

 the genus was first founded were obtained from the Portland Oolite 

 of France (Haute Saone), where a species of Peplosmilia, to which 

 Plevrosmilia is allied, also occurs. Jn the subsequently published 

 Paleontologie Frangaise,- the same distinguished Zoophytologist de- 

 scribed and figured two other species, under the names of Pleiiro- 

 smilia Neocomiensis and P. Barrottei, both from the Neocomien 

 formation of Chatouroupt, Haute-Marne, France. 



Without entering into any of the considerations affecting the 

 correlation of the Greensand of this country with the Neocomien of 

 the Continent, it will be interesting to add to the palceontological 

 evidence already known and recorded, the occtirrence in the Isle of 

 Wight of one of the above-mentioned species, described and figured 

 by M. de Fromentel from the Neocomian strata of France. 



Pletjrosmilia neocomiensis, E. de From. Pal. Fran9. Terr. Cretace, 

 p. 375, pi. 78, fig. 1. PI. XIV. Figs. 12 and 13. 



One specimen only of Pleurosmilia neocomiensis has, as yet, been 

 met with, so far as I know, and it was taken from the " Perna beds " 

 of the Lower Greensand at Atherfield, Isle of Wight. It possesses 

 all the characteristics of the species in a well-marked degree. The 

 shortness of the corallum, the elongated form of the calice, the stout- 

 ness of the septa, and the rugose epitheca, are peculiarities, the 

 presence of which leaves no doubt as to the identity of our English 

 specimen with those figured by M. de Fromentel. 



Professor Quenstedt has proposed that the name AxopJiylhm should 

 be substituted for that of Pleurosmilia, but the latter for obvious 

 reasons must be retained. 



ASTROCGENIA, Sp. 



A single ill-preserved specimen of a small species of Astrocoenia, 

 which was obtained from the well-known locality for Greensand 

 fossils at Farringdon, has fallen into my hands. The base is quite 

 flat, and the upper surface hemispherical. The calices are crowded 

 and have a diameter of about one line. It is not in a sufficiently 



1 Bull, de la Soc. Geol. de France, '2nd ser. 1856. 



2 Terr. Cretace Zooph. p. 375-6, pi. 78. 



