Pulceozoic Corah in the British Museum. 315 



On examining our specimens by means of microscopic 

 sections we found that they belonged to a well-marked form 

 of the genus Chcetetes, as defined by Nicholson. There can 

 be little doubt that the weathering of the surface of his 

 specimens misled Eichwald, and we find, in fact, that some 

 portions of the suiface of our specimens exhibit the same 

 astrffiiform appearance as that figured by Eichwald (pi. xxvi. 

 fig. 17 b, loc. cit.)^. This " laceration " of the cell-apertures 

 we have endeavoured to show in fig. 1. On cutting a section 

 a little below the surface the true structure of the fossil is made 

 perfectly clear. 



It may be well to mention two references that have been 

 made to " Laceripom " of late, the one by Dr. Nicholson, 

 the other by Dr. Lindstrom. The first of these authors 

 records it in his ' Palaeozoic Tabulate Corals ' (p. 180) ; but 

 as he had not seen specimens he confines himself to a transla- 

 tion of Eichwald's description, and some observations upon 

 the genus, in the course of which he refers it provisionally to 

 the Favositidfe, in deference to the opinion of Dr. Lindstrom, 

 who had stated that it was " nothing more than a highly per- 

 forated Favosites'^ (this Journal, ser. 4, vol. xviii. p. 12, 

 1876). Dr. Lindstrom, however, reinstates ^^ Laceripora^'' 

 as a valid genus in his ' Index to Genera of Palajozoic 

 Corals' (1883). 



The identification of the present species with Chcetetes ex- 

 tends the range in time of that genus, the Devonian being the 

 lowest horizon in which it was before known to occur. 



Locality and Horizon, Hoheneichen, island of Oesel. 

 Upper Silurian (Etage K of Schmidt). 



Collection. British Museum (Nat. Hist.). 



Favosites major, Rominger, sp. 

 (PI. XL figs. 2,2 a, 2 h.) 



Thecia major, Rom. Geol. Surv. of Michigan, Lower Peninsula, C. 

 Rominger, 1873-76, part ii. Palaeontology, Corals, pi. xxv. figs. 1, 2, 

 p. 67. 



Sp. char. Corallum forming discoidal masses with tapering 

 margins, the base being covered with a concentrically wrinkled 

 epitheca. The calices are polygonal, with somewhat thickened 

 walls; they are nearly uniform in size, about 1| millim. in 

 diameter, but clusters of cells smaller than the average are 

 here and there to be met with. Numerous septal spines 

 radiate in an upward direction from the walls of the calices ; 

 they appear to form two series, the longer of which reach 

 nearly to the centre of the calice . It is impossible to speak 

 * See Plate XI. fijr. I <: 



