BRYOZOA. 475 



earlier Calamopora incrustans. Founded upon this species, Fis- 

 tulipora exactly occupies the ground that I had proposed to 

 assign to Lichenalia of Hall (loc. cit.} Unless it can be shown 

 that the original New York specimens, upon which Lichenalia 

 was founded, are different from the very abundant Niagara 

 species at Waldron, Ind., that is generally identified with L. 

 concentrica, Hall's name must be abandoned. Strictly then, 

 Fistulipora includes all the unilaminar forms in which the lunar- 

 iuni ("folds") is a recognizable feature. I am still in doubt 

 what course to pursue in disposing the large group of species 

 (at least fifteen) in which the lunarium is obsolete and the 

 zooecial apertures circular or oval. Fistulipora minor Nicholson 

 (non McCoy) seemed to belong to this group! and, relying 

 upon the correctness of Dr. Nicholson's identification, I pro- 

 posed in my Am. Pal. Bry. to restrict Fistulipora to species of 

 that tvpe. But, as already mentioned, F. incrustans, the type 

 of the genus, has distinct lunaria, and all the characters usually 

 assigded to Lichenalia, hence it is clear my proposal cannot be 

 entertained, and that FistuUpora as defined by me though 

 possibly congeneric, is not strictly identical with typical Fis- 

 tulipora. 



Hall's new genus Thallostigma* is proposed for Bryozoa with 

 all the characters Fistulipora (Lichenalia) excepting that the 

 interzooecial spaces exhibit the cavities of the vesicles at the 

 surface. This feature is not of structural value and, in every 

 case that has come under my observation, it represented either 

 the young condition when the vesicles were forming, or the in- 

 terior of the vesicles was exposed by attrition. 



The range of the genus as no Understood is very extensive, a 

 large massive form, not yet described, having lately been dis- 

 covered in the Galena limestone of Manitoba. Several Cincin- 

 nati group species which have been referred to the genus, prove 

 upon examination to belong to the CERAMOPORIDJ:, and, so far 

 as I now am informed, no true Fistulipora occurs in these 



: Nicholson and Foord's figures of the species show faint "folds" in the walls which 

 were deither mentioned nor figured by Dr. Nicholson. 



* Trans. A.lb. Inst. Vol. X, 1883. (Abstract published in 1881.) In Vol. VI, Pal. N. Y. 

 Prof. Hall abandons this name in favor of Fistulipora. 



