T. M. Eall—On the Rocks of JSf. Devon. 305 



DiMOKPHASTR^A DUBiA, E. de From., Introd. a I'Etude des Polyp. 

 Fos. p. 224 (1858—1861). 



Several examples of a Coral have been obtained directly from the 

 Coral-bed of Crickley which, appear to answer to the description of 

 the D. dubia of M. de Fromentel, which is recorded by him as occur- 

 ring in the Coralline Oolite of Nathein, in Wurtemburg. They all 

 differ from that species, however, and indeed from the genus Dimor- 

 phastrcea, in having a well- developed epitheca. In well-preserved 

 sjDecimens the calices are placed in the bottom of circular grooves, 

 surrounding the central, or parent calice. These grooves have some- 

 thing the appearance of the calicular furrows in Latimceandra, but in 

 much worn or polished specimens the calices are seen to be at equal 

 distances from each other, and in circles. In no example is there 

 any trace of columella. The large central calice, and the regular 

 disposition of the smaller ones around it, will identify the species 

 with the above genus ; though the calicular furrows might at first 

 sight lead to the supposition that it is referable to some species of 

 the genus Oroseris. 



The foregoing species, with the exception of Montlivaltia lens, 

 occur, there is no doubt, in what Dr. Wright designates the Lower 

 Coral Eeef of the Gloucestershire Hills ; for although some of them 

 were not taken directly from the reef, but were found weathered out 

 on the slope below, the nature of the still partially investing matrix 

 points out pretty clearly the source from which they were derived. 



The occurrence of Montlivaltia lens in the Cephalopoda-bed, at 

 Crickley and near Chipping Campden, and associated at the latter 

 place with two other species of Corals, is interesting as showing an 

 approach to those conditions of oceanic life which became shortly 

 afterwards so highly favourable to the growth of Coralline existence. 



A peculiarity observable in many of the Crickley Corals is their 

 thin and expanded form. This is more especially the case with 

 Isastrcea expansa, Clausastrcea consobrina, Thamnastrcea Mettensis and 

 Th. Fromenteli. In some others this peculiarity, though less dis- 

 tinctly marked, is not wholly absent. Thamnastrcea Defranciana, 

 Th. Terquemi, and DimorphastrcBa dubia, while characterized by a 

 somewhat turbinate form, are nevertheless often so much depressed 

 as to become almost discoid, with a somewhat foliaceous marg-in. 



IV. — The late Professor Phillips on the North Devon Eocks ; 

 WITH AN Introductory Note 

 By TowNSHEND M. Hall, F.G.S. 

 rilHE Meeting of the British Association at Plymouth has not 

 JL unnaturally been the means of directing attention to some of 

 the most complex points of Devonshire geology, and of revivino- the 

 discussion as to the age and position of the Devonian series in 

 North and South Devon. Mr. Jukes, it will be remembered, died 

 in 1869. Had he lived longer, his energy of purpose would 

 doubtless have led him to carry on the work he had begun, until 

 he could either prove the correctness of his views, or satisfy himself 

 that the generally accepted classification was, after all, the right one. 



DECADE II. VOL. V. — NO. VII. 20 



