American Palceozoic Bryozoa. 



149 



diating spines" have been observed 

 in species of Discoporella and Heter- 

 opora. 



(10) . Two teeth or lamellae, projecting 

 from one side of the tube-walls into 

 the zooecial cavity — 



In Crepipora, Ulrich. 

 Discoporella, Gray. 

 Myriozoum, Donati. 



(11) . Opercular plates covering the tube- 

 orifices, as in Callopora, Hall — 



In Cystodictya, Ulrich. 

 Eridopora, Ulrich. 

 C lausimultelea, D'Orb. 

 Meliceritites, Roem. 

 Nodelea, D'Orb. 

 Myriozoum, Donati. 



(12) . Connecting foramina — 



In many of both the Cheilostomata and 

 Cyclostomata. (This character has 



been proved to exist in only two gen- 

 era of the Monticuliporidm, i. e., Ste- 

 nopora, Lonsdale, and Monticulipora, 

 D'Orb. 



(13). Monticules and macula?— 



These are developed in a great many 

 types now placed with the Cyclosto- 

 mata. As examples of monticulifer 

 ous genera may be mentioned — 



Nodicava, D'Orb. 



Nodicrescis, D'Orb. 



Heteropora pustxdosa, Michelin. 



Ptilodictya, Lonsd. (several species). 



Examples of genera with "macula?," 

 are — 



Ditaxia, Hag'w. 



Zonopora, D'Orb. 



Radiopora, D'Orb. 



Phamopora, Hall. 



Pachydictya, Ulrich. 



Crepipora, Ulrich. 



SCHEME OF CLASSIFICATION OF THE AMERICAN PALEOZOIC BRYOZOA. 



Order Gymnol^emata, Allm. 

 Sub-order Cyclostomata, Busk. 

 Family Tubuliporidce, Busk. 



Stomatopora, Bronn. — Zoarium adnate, with the cells in a single 

 branching series. Cell-mouths elevated, sometimes tubular, and 

 situated near the end of the cells. Trenton to recent. 



Proboscina, Audouin. — Like the preceding, but with, the cells in two 

 or more series. Cincinnati* to recent. 



Berenicea, Lamx. — Zoarium much like that of the foregoing, but 

 forms rounded or irregular patches. Cincinnati, Mesozoic and recent. 



Bopalonaria, Ulrich. — Cells slender fusiform, in a single amastomos- 

 ing series. Cell-mouths situated near the middle of the cells. Cin- 

 cinnati. 



* By the term "Cincinnati group," I mean the strata included between the lowest 

 exposed in the bed of the Ohio river near Cincinnati, and the overlying Upper Silurian 

 strata. They are in all probability equivalent to the Utica Slate, and Hudson River groups 

 of New York. 



