56 STANLEY SMITH. 



from this solitary and imperfect specimen. It may be a 

 large form of Aprophyllum (it measured two centimetres 

 in diameter) or, as possibly another cyathophylloid form. 



Lithostrotion Fleming, 1828. 

 (History of British Animals, p. 509). 

 Genotype. L. basaltiforme Conybeare and Phillips, 1822, 

 ("Outlines of the Geology of England and Wales," p. 359) = 

 " Lithostrotion si ve Basaltes minus striatum et stellatum." 

 Lhwyd, (Lithophylacii Britannici Ichnographia, 1699, p. 125 

 and pt. xxiii). 



Fleming, under the name Lithostrotion, described four 

 coral species, namely: — 



L. striatum Flem., citing Lhwyd's figure. 



L. floriforme Martin ("Petrificate Derbiencia," 1809, 



pt. xliii, figs. 3 and 4; pt. xliv, fig. 5). 

 L. oblonqum Parkinson ("Organic Remains etc." 1808). 

 L. marginatum, Flem. 



Although Fleming did not expressly state it, it is clear 

 that he considered Lhwyd's form as the genotype of Litho- 

 strotion, he adopted the name employed by Lhwyd for the 

 genus, placed L. striatum first in the list, and definitely 

 referred to Lhwyd's figure. To this form, Martin's species 

 bears no close affinity. 



William Lonsdale ("Description of some characteristic 

 Palaeozoic Corals of Russia," see R. I. Murchison et Alii. 

 "The Geology of Russia in Europe and the Ural Mountains," 

 Vol. I, p. 602 et seq.) selected Martin's species Eusmato- 

 lithus Madreporltes (ftoriformis) as the genotype of Flem- 

 ing's genus. The choice was an unfortunate one, and its 

 legitimacy has been challenged by such eminent authorities 

 as Milne Edwards and Haime (British Fossil Corals p. 206). 

 Since Fleming did not, in so many words, fix Lhwyd's figure 

 as his genotype, Lonsdale was at liberty to select any one 



