UN lOSSIL POLYZOA. 1G3 



G0N(ECIUM. ' A modified zooecium or cell, set apart for the purposes of 



reproduction.' 

 GoNOCTST. ' An inflation of the surface of the zoarium in which the 

 embryos are developed.' Modern terms from the Rev. Thos. 

 Hincks. 

 I have no desire to discuss my use of the term ' Polyzoa ' instead of 

 ' Bryozoa.' I use it as a matter of choice after carefully considering all 

 that has been said by my friend Mr. Waters, Hincks, Busk and others. 

 After all the question of priority is still an open one, and those of my 

 readers who desire to consult authorities will find ample material in a 

 paper ' On the Priority of the term Polyzoa for the Ascidian polypes ' 

 Busk, 'Ann. Nat. Hist.,' 1852, Rev. T. Hincks' ' Brit. Marine Polyzoa,' 

 p. cxxxii, and A. W. Waters' 'Ann. Nat, Hist.,' January, 1880. 



.... ■ Sub-order Cheilostomata, Busk. 



Genus Hippothoa, Lamx. 



Hippothoa inflata, Nicholson, ' An. Mag. Nat. Hist.,' February, 1871, 



PL xi. fig. 4. 

 Aledo inflata, Hall, ' Pal.' New Tork, vol. i. p. *?7, pi. xxvi. figs, la-lh. 



This species of Hall's has been reworked from fresh material, by 

 Nicholson. The slight figures given by him show a habit nearly akin to 

 Kippotlioa alstersa, Busk, fig. 6, pi. 22, Busk's ' Crag Polyzoa,' only rather 

 more swollen at the distal part of the cell. In the cell-mouth of Busk's 

 figure the peristome is sinuated : in Nicholson's figure it is circular. There 

 is also a resemblance to Goldfuss' Aulopora dichotoma, Tab. 65, Fig. 2. I 

 know of no species of HipjDothoa, recent or fossil, with which it can be 

 otherwise favourably compared. Generically it has no affinity with the 

 HippOTHOlD^ of Busk, and without doing violence to the generic character 

 of Hippothoa as given by Hincks,' it cannot be placed with the genus. 

 The species, Nicholson says, is abundant in the Cincinnati Group of the 

 Hudson River formation, near Cincinnati, Ohio. 



Genus Betepora, Imperato. 



Ever since this genus was introduced in 1559, it has been used by 

 authors indiscriminately for all manner of fenestrated polyzoa. Lamarck, 

 in 1815, fixed the type of Linnaeus, Millepora cellulosa, calling it E. cellulosa, 

 and since then, the name Betepora has been used for a genus of tbe 

 EsCHARiD^. None of the so-called Retepora of the Pateozoic era haAc 

 any affinity with this family, or even with the genus as now itndevstood. 

 The word should be entirely abandoned for every species of Palivozoir 

 Polyzoa. 



183G. Escharina, Milne-Edwai-ds. 



1847. Escharopora, Hall. 



As both these genera have been used by authors ^ for Palceozoic 

 species it may be as well to draw attention to its misuse. The types E. 

 recta and the var. nodosa Hall compares with Eschara ? scalpellum — now 

 Ptilodictya scalpelhim, Lonsd., and the Escharina of Milne-Edwards, in 



1 Brit. Mar. Poly., p. 286. 



- Escha/rina wnguldris, Lonsd., Morris Catalogue. Escharipora recta. Hall, Pal. 

 New York, vol. i. 



M 2 



