42 TABULATE CORALS. 



singular structures — the " squamulae " of Dr Rominger — are 

 particularly characteristic of certain Devonian forms, but they 

 occur also in the Upper Silurian F. For best. We cannot, 

 therefore, accept the statement made by Dr Rominger (Foss. 

 Cor. of Michigan, p. 19), that "the Silurian forms differ from 

 the Devonian Favosites by invariably having simple dia- 

 phragms, and by the spinulose character of their radial crests." 

 At least one Silurian species of the genus, on the contrary, is 

 known to possess imperfect tabulae as a variation ; and many 

 forms exhibit no septa (" radial crests ") at all, or only rows of 

 tubercles. Nor can we accept the view held by Dr Rominger, 

 that the " squamulae" of certain species of Favosites are really 

 of the nature of septa. On the contrary, the fact that their 

 direction is one transverse to the axis of the visceral cavity, 

 and that they commonly occupy the entire width of one of the 

 prismatic faces of a corallite, entirely precludes our believing 

 that they can have been situated in the inside of one of the 

 " mesenteries " of the living animal, and is thus fatal to the con- 

 ception of their septal character. They must, on the other hand, 

 be regarded as a peculiar modification of the tabiUcB of the more 

 typical species, and they not uncommonly coexist with these. 



In no case known to me are the tabulae of Favosites in- 

 fundibuliform, or invaginated one into the other ; and this 

 leads me to say a few words as to the genus Calamopora of 

 Goldfuss, and as to the propriety of the course followed by 

 many Continental palaeontologists in substituting the latter 

 name for the former. The actual definition of Calamopora 

 given by Goldfuss (Petref. Germ., p. 72) is as follows : — 



** Stirps calcarea, e tubis p^Hsmaticis parallelis contiguis 

 divergent! bus. Tiibi diapln^agmatibus transversis {e siphone 

 prolifero) inter septi, et poris lateralibus communicantesJ' 



Not only do his subsequent descriptions and figures render 

 it certain that the forms included under this head by Goldfuss 

 are precisely the same as those long before placed by Lamarck 

 under Favosites, but he himself admits this ; and the only new 

 characters which he gives are to be found in the words "e siph- 



