328 Reports and Proceedings — 



wingk in considering Baerocrinus as a distinct generic type. The 

 calyx consists of five basals supporting five radials, of which only 

 three bear arms, while there is no indication of any anal system, 

 unless it be the so-called Volborth's organ. Baerocrinus is probably 

 to be regarded as a permanent larval form, w^hich has only developed 

 arms on three of its radials. 



Hybocystites problematicvs, from the Lower Silurian of Kentucky, 

 which is supposed by Wetherby to be an intermediate form between 

 the Crinoids and the Cystids, is believed by the author to be more 

 closely allied to the Blastoids than to the Cystids. The three so- 

 called arms are merely upward prolongations of the radials, which 

 are segmented in the same way as the downward extending radials 

 are in Pentacrinus hriareus. They are not arms like those of Uybo- 

 crinus and other Crinoids. Of the five ambulacra that diverge Irom 

 the peristome, the right and left anterior ones pass directly down- 

 wards from the summit on to the corresponding radials, and thence 

 on to the basals. The other three ascend the inner faces of the 

 short radial extensions, pass over their tops and down their outer 

 faces, where they have been described as " more or less obscure 

 furrows, of which nothing further is known." In some cases they 

 reach the basals, and in others not, exhibiting a considerable amount 

 of variation both in this and in other respects. There are therefore 

 five recurrent and appressed ambulacra, and not two only, together 

 wdth three arms, like those of Crinoids. 



2. " On the Madreporaria of the Inferior Oolite of the Neighbour- 

 hood of Cheltenham and Gloucester." By E. F. Tomes, Esq., F.G.S. 



The author called attention to the observations of Milaschewitsch 

 on " EejuA^enescence " in corals, published in vol. xxi. of the Palse- 

 ontographica, and explained its nature as opposed to "gemmation." 

 He suggested that, in describing corals, the following classification 

 of the costse should be adopted : — 



1. Mural cos/ce=those which appear on the wall, whether of 



simple or compound species. 



2. Septal costce=^those which are a prolongation of the septa. 



3. Inter calicular cosfcE=those which cover the coenenchyma between 



the oalices. 



He adopted in general Dr. Wright's views as to the stratigraphical 

 position of the coralligenous deposits in the Gloucestershire Inferior 

 Oolite, and gave a tabular statement of the distribution of the species 

 in the several coral-beds, pointing out that each of these has its own 

 species, which do not pass much from one to the other. He recorded 

 about sixty species, many of which were described as new, and 

 proposed two new genera {Phyllogyra and Phylloseris) , besides intro- 

 ducing five or six genera previously characterized on the Continent, 

 but not recognized in England, namely, Donacosmilia, Confasastroea, 

 ChorisastrcBa, Oroseris, and DimorpJiarcBa. 



The author referred especially to some so-called Thecosmilice, such 

 as T. gregaria, and insisted that they should be removed to the 

 genus Chorisastrcsa, as they increase by gemmation at the base 

 only of the corallum, and never by fissiparity, as in the type of 



