BRYOZOA—CRYPTOSTOMATA. 



163 



LXXXIX. Scalaripora Hall. 

 Like Prismopora, but with faces of triangular branches crossed 

 by salient transverse ridges. Dev. 



153. S. scalariformis Hall. Devonic. 

 Faces of branches 3.5 to 4 mm. wide, ray concave, the transverse 



ridges at intervals of 1.5 mm. and having a height at center of face 

 of I mm. ; celluliferous ; apertures circular, with pronounced per- 

 istomes, irregularly disposed. 

 Hamilton, Falls of the Ohio. 



XC. Glyptopora Ulrich. 

 A thin expansion, with salient ridges or crests on both surfaces, 

 uniting into cup-shaped cavities; tidges sometimes pronounced 

 and leaf-like, composed of two layers of zocecia arising from a 

 mesotheca ; upper surface with solid maculae or dimples. Miss. 



154. G. sagenella (Prout). (Fig. 214, e.) Mississippian. 

 Cups elongate, often groove- or channel-like ; summit of ridges 



Fig. 214. a, Pachydictya fimbrinta, X K and X 4^ 5 <*> Cystodictya giloerli, 

 X 3 ; c t Dichotrypa lyroides, fragment showing base, X /^ > ^> Coscinium latum, X Yz > 

 <r, Glyptopora sagenella, X Yz \ /■> Evactmopora radiata, basal and lateral views, X Y *» 

 g, £. grandis y X Y* '■> &> Actinotiypa peatliaris, surface, X $Y 5 h Worthenopora 

 spinosa, fragment showing spines, X 4Y> an ^ P ort i° n of same enlarged, X x 4> ^» 

 Stictotrypa punctipora, X /^> anc * fragment, X 2 « (After Ulrich and Hall.) 



