314 Messrs. E. Etlicvidge, Jim., and A. H. E"'oor(l on 



XXXVIII. — Descrijjtions ofPalmozoic Corals in the Collections 

 of the British Museum {Nat. Hist.).— 'No. II. By Robert 

 Etheridge, Jun., and Arthur H. Foord, F.G.S. 



[Plate XL] 



Chxetetes cribrosa, Eicliwald, sp. 

 (PI. XI. figs. 1, 1 a, 1 b.) 



Lnceripora cribrosa, Eicliw. Letha3a Rossica. vol. i. pi. 26. fig. 17, a, 

 b, c, p. 490 (1860). 



Sp. char. Corallum ramose, thick, subcjlindrical, about 

 2 centim.in diameter; length miknown, owing to the specimens 

 being imperfect. Corallites minute, contiguous, polygonal, 

 measuring from one half to three quarters of a millim. in their 

 greatest diameter, generally of the latter size. Transverse 

 sections exhibit in a very characteristic manner those incipient 

 divisions of the cells peculiar to Chcetetes. The tabula?, as 

 seen in longitudinal sections, are numerous and complete. 



Obs. This species differs from C. radians, Fischer, in 

 its habit of growth, larger cells, thinner walls, and more 

 numerous tabular. Some explanation is necessary witli re- 

 gard to the alteration we have made in the generic name 

 of Eichwald's species. Finding the name ^^ Laceripora''^ 

 attached to one of the specimens in the collection, and this 

 proving upon examination to be a Favositoid coral, we deter- 

 mined to obtain, if possible, authentic examples of Eichwald's 

 genus in order to ascertain its structure and affinities. With 

 this object we wrote to Prof. F. Schmidt, of St. Petersburg, 

 asking him if he could supply the Geological Department 

 with some specimens of " Laceripora " cribrosa, as recog- 

 nized by the Russian pala3ontologists. Prof. Schmidt very 

 kindly acceded to our request by sending us two specimens of 

 that form, accompanied by the following note addressed to one 

 of the writers of this article : — " The specimens oi Laceripora 

 cribrosa, Eichw., are found in a cliff called Kattripank, near 

 Hoheneichen, in the island of Oesel. They form long branches 

 in a coral reef consisting principally of Stromatopora. All 

 the surrounding country belongs to the uppermost division of 

 our Silurian (Etage K of my last arrangement and G of the 

 former, = Ludlow). The Leperditia phaseolus is found in the 

 same cliflf ; tliere can be no doubt about the geological horizon. 

 I regard the mentioned layer as covering the Eurypterus-beds 

 of ... The mentioned coral reef passes over in the neigh- 

 bourhood (at Karral) to limestone beds containing Chonetes 

 striatelld and Sjn'rijer elcvutus.'''' 



