66 BRITISH FOSSIL CORALS. 



broad, straight, granulated laterally, unequally developed, but not differing much in the 

 first and second cycla. Pali corresponding to the septa of the first three cycla, rather 

 narrow, and unequally developed. in an inverse ratio to the corresponding septa • no pali in 

 the radii of the septa belonging to the fourth cyclum. Height of the corallum, three lines ; 

 diameter of the calice, four lines. 



This species belongs to the fourth section of our genus Trochocyathus {T. breves), and 

 consequently its characters need not be compared with those of the various species belonging 

 to the sections of the T. simplices, T. cristati, and T. multistriati, the description of which 

 may be found in our ' Monograph of the Turbinolidae.' It differs from T. obesus, T. armatus, 

 and T. perarmatus} by not having any costal spines, and from T. Michelini by the costae 

 being distinct down to the basis, and by its general form being less depressed. It appears 

 to be most closely allied to the fossil which we shall next describe under the name of 

 Trochocyathus (?) Konigi, but is of a more slender form. 



T. Harveyanus was found in the Gault at Folkstone, the birthplace of the illustrious 

 physiologist to whom we have dedicated this species. The specimens here described belong 

 to the collections of Mr. Bowerbank and Mr. D. Sharpe. 



3. Trochocyathus (?) Konigi. 



Turbinolia Konigi, Mantell, Illust. of the Geol. of Sussex, p. 85, tab. xix, figs. 22, 24, 

 1822. 



— — Fleming, British Animals, p. 510, 1828. 



— (trochocyathus ?) Konigi, Milne Edwards and J. Haime, Monogr. des Turb., 



in Ann. des Sc. Nat., 3 me serie, vol. ix, p. 335, 1848. 



The specimens of this fossil figured by Mr. Mantell, and those which we have seen in 

 the collections of MM, d'Orbigny and Michelin, are in a very bad state of preservation, 



1 This species, which has been lately designated under the name of Turbinolia perarmata by 

 M. Talavignes, but has not yet been described, and has been given to us by that geologist, was discovered 

 at Fabresan, in the department of the Aude. M. Alex. Rouault has since then met with the same species 

 at Bos d'Arros in the Lower Pyrennees. (See Bull. Soc. Geol., 2 me serie, vol. v, p. 206.) It may be 

 recognised by the following characters : 



Corallum very short, subdiscoidal ; its under surface flat and almost smooth ; sometimes adhering to a 

 small shell. Costce distinct near the calice, projecting very little, closely set, almost equal, and delicately 

 granulated ; those of the first cyclum not differing much from the others, but bearing, at a short distance 

 from the calicular edge, a strong spiniform appendix, which is rather compressed, extends outwards, and 

 presents, on its under edge, a small pointed tubercle. Calice circular. Septa forming four complete cycla 

 and six equally developed systems ; closely set, rather exsert, thin, and unequally developed ; but those of 

 the second cyclum differing very little from the primary ones. Pali narrow and rather thick. Height of 

 the corallum, one line and a half; diameter of the calice, two lines and a half. Fossil from the Nummulitic 

 formation at Fabresan and Bos d'Arros. 



