﻿44 . Cincinnati Society of Natural History. 



group; a large irregularly branched hollow species (perhaps identical 

 with F. utricula, Rom.) in the Upper Helderberg; a large subramose 

 form (F. crassa, Rom.) in the Hamilton group; one irregular sub- 

 massive or lamellate species ( F. prolijica, n. sp,) from the St. Louis 

 group; one lobate or sub-massive form (F. excelens, n. sp) in the Kas- 

 kaskia group; and one lamellate or sub massive species (F. cai'bonaria, 

 n. sp.) from the Upper Coal Measures. In 1866 Rominger published* 

 descriptions of eighteen species, all of which he refered to Fistulipora, 

 Unfortunately none of them were illustrated, and as the descriptions 

 are brief, and entirely inadequate according to our modern ideas, I 

 have not been able to identify the majority of them, and therefore can 

 not say whether they really belong to the genus or not. One, the F. 

 trifolia, is, as already stated, a species of Prismopora. Of F. neglecta 

 and F. crassa I have examined authentic specimens. These doubtless 

 are correctly classified. Of the remaining fifteen species, while I 

 can not say anything positive of them, several will probably be found 

 to belong to Lichenalia, Hall. At least some of the Devonian forms 

 have been redescribed, in an equally unsatisfactory manner by Hall,f as 

 species of Lichenalia. This genus, although closely allied to Fistuli- 

 pora, should, I think, be held as distinct. Fig. 5, Plate III., represents a 

 a tangential section of Lichenalia concentrica, Hall, the type of the 

 genus, and shows the only reliable character by which the genus can 

 be distinguished from Fistulipora. By comparing this section with 

 those of three typical species of Fistulipora represented on the same 

 plate by figs. 1, 2, and 3, we find, that while the zocecia of the latter 

 are sub-circular in form, and thin walled, those of L. concentrica have 

 thicker ring-like walls, and a sub jyyriform outline, the walls being 

 sharply inflected and recurved, at two points near each other. This 

 bidenticulate character of the zocecial apertures is stated by Hall to 

 have been observed in nine of the nineteen Devonian species de- 

 scribed by him; and as it is the only important character wherein L. 

 concentrica, the type of the genus, differs from typical species of 

 Fistulipora, it must be regarded as the distinctive generic character 

 of Lichenalia. If, however, the importance of the feature is not ad- 

 mitted, then the name Lichenalia must be abandoned. On the other 

 hand, if its value is conceded, then the genus must be restricted to 

 species with thin, lamellate or bifoliate zoaria, and more or less dis- 



* Proc. Acad. Nat. Sci. of Philacl. 



f Bryozoans of the Upper Helderberg group. In this pamphlet Prof. Hall describes no 

 less than nineteen species of Lichenalia. 



