the Oenus Fistulipora, M^Coy. 499 



siphonoglyphe, though it is not so well marked as in the 

 siphonozooids*. 



We must not overlook the fact, however, that in Sarco- 

 fhyton the siphonoglyphe is present only along the inner 

 third of the stomodasumf, whereas in Fistulipora the fold, 

 which we have assumed to have supported this ciliated groove, 

 extends uninterruptedly throughout the entire length of the 

 autopores, and, moreover, it appears upon the surface of the 

 corallum in the form of a prominent arched lip in the apertures 

 of those cells. 



The occurrence of folds in the walls of the autopores of the 

 Fistuliporce has been observed by Dr. Rominger|, of Ann 

 Arbor, Michigan, who, however, does not appear to have 

 attached any importance to it. Though unaccompanied by 

 figures his descriptions are generally of sufficient exactness to 

 enable the species to be identified. One of them, Fistulipora 

 utriculusy is described and figured in this article. One of the 

 writers has also noted and illustrated the structure in question 

 in Fistulipora incrassata §. Mr. Ulrich of Cincinnati has 

 published descriptions of a number of species of Fistulipora\\ ; 

 but he makes no mention of folds in the walls of the autopores, 

 the apertures of which he figures as rounded or oval in out- 

 line with more or less thickened margins. His omission of 

 the folds in the autopores is not difficult to account far, as 

 when not distinct they may be easily overlooked, especially 

 in sections which have not been cut exactly at right angles to 

 the longer axis of the corallites. The folds are represented, 

 however, in an unmistakable manner in a figure Mr. Ulrich 

 gives of Lichenalia concentrica, Hall^, and they form the 

 subject of some remarks upon the genus Lichenalia^ which 

 are here condensed. Mr. Uh-ich proposes to eliminate from 

 the genus Fistulipora^ and place in Lichenalia^ those species 

 possessing " thin, lamellate, or bifoliate zoaria, and more or 

 less distinctly bidenticulate apertures" [= folds]. As, how- 

 ever, Fistulipora mcrustans, the type of the genus Fistuli- 

 pora, possesses such "bidenticulate apertures" as one of its 

 most marked chai'acters, it is clear that Mr. Ulrich's proposal 

 cannot be entertained, and that Lichenalia, as he has charac- 

 terized it, is a Fistulipora. 



It has now become necessary to give a new diagnosis of the 

 genus Fistulijjora, so as to introduce into it the peculiar struc- 

 tural features which we have been dwelling upon. 



* Loc. cit. p. 695. t Ibid. 



X Proc. Acad. Nat. Sci. Philadelphia, 1866, p. 11.3. 



§ H. A. Nicholson, Pal. Tab. Corals, 1879, p. 308. 



II Journ. Cincinnati Soc. Nat. Hist. vol. vii. April 1884, p. 43. 



^ Loc. cit. pi. iii. fig. 5. 



34* 



