PALAEONTOLOGY OF ONTARIO. 131 



llT. Crania crenistriata, Rail {11.) 



118. Coelospira concava, Hall (G.) 



119. Centronella glans-fagea, Hall (C.) 



120. " Hecate, BilUvgs (C.) 



IV. FOLYZOA. 

 The remains of Polyzoa in the Devonian Rocks of Western Ontario 

 are very abundant, and they are of unusual interest in many ways. 

 Unfortunately, however, they are for the most part fragmentary, and 

 their study is thus attended with special difficulty, since there is no 

 class of organisms requiring greater skill and patience in their inter- 

 pretation. Altogether, I have been able to identify nineteen species 

 of Polyzoa, of which, owing to the general neglect of this class by 

 paljeontologists, no less than fifteen appear to be new, whilst several 

 forms have come to light belonging to new generic types. There remains, 

 however, a considerable number of forms, of which the materials at 

 present in my hands are too fragmentary to justify definitive 

 description. The forms w^hich I have considered myself warranted 

 in describing belong to the following genera : — Fenestella, Retepora, 

 Poly para, Cryptopora, Carinopora, Taeniopora, Ceriopora (1), Botryllo- 

 pora, Ptilodictya, and Clathropora. The first three of these genera 

 are typical members of the family of the Fenestellidce, and they com- 

 prise more than one-half of the total number of species identified. 

 Tt is to these genera also that most of the undeterminable fragments 

 belong, so that the Fenestellidce must have had a very great develop- 

 ment in the Devonian period in North America. The genera Crypto- 

 pora and Carinopora, now characterized for the first time, also belong 

 to the Fenestellida} ; but they exhibit many extraordinary and, 

 indeed, altogether unprecedented points of structure. The last two 

 genera, as well as Taeniopora and Botryllopora, present many points 

 of special interest ; and as they are all new generic types, it may be as 

 well that a brief diagnosis of each should be given here : — 



1. Cryptopoea, gen. nov. — Polyzoary, forming a rigid, infundibuli- 

 form, calcareous expansion, springing from a strong, solid branching 

 root-stock or rhizome. Exterior of the cffinoecium forming a con- 

 tinuous, non-perforated, thin, calcareous membrane, internal to w-hich 

 is a second or intermediate layer, the two being composed of the 

 amalgamated and coalescent branches ("interstices"). The inter- 

 mediate layer is marked by shallow, longitudinal, and bifurcatmg 

 sulci, corresponding with the lines between the branches, and its 



