276 Prof. F. M'Coy on some new genera 



vesicular plates ; one half of the lamellae scarcely extend beyond 

 the outer zone, the other half suddenly increase in thickness 

 and proceed towards the centre, where they are irregularly 

 united, connected by few large, curved, vesicular plates, form- 

 ing nearly transverse rows of irregular cells : vertical section, 

 outer third on each side very dense, of extremely small rounded 

 vesicular plates nearly united, inner half of diameter composed 

 of much larger, thin, irregular vesicular plates. 



This coral may be distinguished from the Cystiphyllum crjlin- 

 dricum (Lonsd.) by the distinct radiating lamellee towards the 

 centre, and the small size of the vesicular structure towards the 

 circumference, forming an almost solid white granular structure. 

 The Devonian C//athophi/llum vermiculare of Goldfuss (also a 

 Strephocles) is almost identical in external appearance, but has 

 the radiating lamellfe thickest in the outer area, straighter and 

 alternately of very unequal thickness, and wants the remarkable 

 dense, almost unradiated outer zone. The lamellse as usual are 

 less numerous in young tubes of smaller diameter. 



As far as I can judge from the figure alone, I should think the 

 coral figured by Lonsdale as the Cyathophyllum ccespitosum of 

 Goldfuss (S. S. t. 16. f. 10) from the Wenlock rocks might be 

 probably referred to this species, which, in general size, form and 

 mode of grouping of the branches, it resembles ; it is quite cer- 

 tain that it has no relation to the true Eifcl species of Goldfuss, 

 which is common in the Devonian limestone of Newton Bushel, 

 Torquay, Plymouth, &c., which has slender, even, dichotomous 

 branches and broad transverse diaphragms, &c. 



Wenlock limestone of Wenlock and near Aymestry. 



Cystiphyllum brevilamellatum (M'Coy). 



A 



Sp. Char. Corallum elongate, subcylindrical, preserving for se- 

 veral inches a diameter of little more than an inch, slightly 

 tortuous, and with obscure, irregular swellings of intermittent 

 growth ; outer wall extremely thin, strongly ribbed with alter- 

 nately larger and smaller vertical lamellar sulci, about four 

 large and three smaller in the space of 3 lines, at the diameter 

 of 1 inch (or eighty- four all round) ; terminal cup with a cir- 

 cular depressed centre, equaling rather less than half the dia- 

 meter, surrounded by an inclined outer area composed of 

 twenty-four radiating lamellse (corresponding to the stronger 

 external sulci) extending from the walls about one-fifth of the 

 diameter, connected by close numerous transverse vesicular 

 plates, having at the margin an equal number of extremely 

 short lamellse (corresponding with the smaller external ridges) ; 

 internal area broad, formed of large vesicular plates irregularly 



