TECTULIPOKA nov. sub. gen. 

 Fenestella (Tectulipoea) loculata n. sp. 



Bryozoum consisting of infundibuliform fronds of compact appearance. 

 Tliicliness of frond about .60 mm. Branches moderately slender, width 

 just above a bifurcation .30 mm., regularly increasing to .55 mm., subangu- 

 lar or rounded, with from three to five distinct longitudinal striations ; 

 opposite the dissepiments the branches are slightly elevated. On the 

 specimens observed the bifurcations occur at intervals of from 10 to 

 20 mm. 



Dissepiments comparatively slender, width about .15 to .18 mm., rounded, 

 depressed below the plane of the branches, and expanding at their junc- 

 tion ; about eleven in the space of 5 mm. 



Fenestrules regularly oval, length from .32 to ,38 mm., width about two- 

 thirds the length. 



On the cellulif erous face the branches are angular. Dissepiments very 

 slender, angular, much depressed. Fenestrules narrower than on the 

 opposite face. Cell apertures in two ranges, opening directly outward, 

 very closely disposed, and often in contact ; about thirty in the space of 5 

 mm. Margins elevated, and distinctly indenting the borders of the 

 fenestrules. 



Branches between the ranges of apertures and along the middle of the 

 dissepiments carinated ; carina .30 mm. high, for half the height very thin, 

 then rapidly expanding, those of the branches to a width of about .25 mm., 

 and those of the dissepiments to .15 mm., the expanded portions having 

 the appearance of the non-celluliferous face of some form of Fenestella. 

 These pseudo-branches and dissepiments are broadly angular, with a slight 

 carina along the middle. The fenestrules are a little larger than on the 

 non-celluliferous face. 



This subgenus differs from Loculipora, which it closely resembles, 

 in having the cell apertures in straight lines along the branches and not 

 surrounding the fenestrules, there being no apertures on the dissepiments. 

 The apertures on each side of the carina of the dissepiments at its junc- 

 ture with the branch are separated but slightly, if any more than the 

 others. 



Of the forms resembling Fenestella {Unitrypa ?) unsinalis a new subgenus 

 should be made. It would differ from this one in having no caringe on the 

 dissepiments, and in the pseudo-dissepiments not being equal in number 

 to the true dissepiments. 



Formation and Locality.— how ev Helderberg group, near Clarksville, 

 Albany county, N. Y. 



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