92 



THE GENUS MONTICULIPORA. 



The identity of Fistiilipora, M'Coy, and Callopora, Hall, 

 has long been more than suspected, the chief difficulty in the 

 way of uniting the two being that M'Coy states that the tabular 

 in the large corallites of Fistuiipora are infundibuliform, while 

 Hall describes radiating septa (/, <?., true " septa") as sometimes 

 present in the type-species of Callopora. McCoy's statement 

 as to the tabulse is, however, clearly based upon imperfect 

 observation, and this is also almost certainly the case as to the 

 alleged occurrence of septa. At any rate, having carefully 

 examined specimens of F. minor, M'Coy, the type of the genus 

 Fistidipora, and having compared these with typical examples 

 of Hall's genus Callopora from the Silurian and Devonian 

 rocks of North America, I am satisfied that the two are un- 

 questionably congeneric, and that both must be united under 

 the older name oi Fistnlipora, M'Coy. 



The species of Fistulipora agree in the possession of a 

 dimorphic corallum, composed of two sets of corallites of con- 



Fig. \G. — Fistulipora minor, M'Coy, the /j'/t'-species of the gcnns Fistulipora, M'Coy. A, Por- 

 tion of a tangential section, showhig the rounded large tubes [a a) and the angular inter- 

 stitial tubes (/' b) ; B, Portion of a vertical section, showing two of the large tubes, almost 

 free from tabulae {a a), and the interstitial vesicular tissue formed by the tabula of the 

 smaller tubes {!) b). The sections are enlarged twenty-five times. 



spicuously different sizes, and bearing definite relations to one 

 another (fig. i6). The large corallites are markedly circular or 



