120 DiCTYOSPONOIDvE. 



Ceratodictta annulata, Hall (sp.). 



Plate xxii, Figs. 3-6. 

 1863. Dictyophyton annulatam, Ilall. Sixteenth Ann. Rept. N. Y. State 



Cab. Nat. Hist., p. 90, pi. iii, fig. 3. 

 1882. Dictyophyton annulatum, Hall. Notes on the Family Dictyospongidae, 



pi. 17, fig. 5. 

 1884. Dictyophyton annulatum, Hall. Thirty-fifth Ann. Rept. N. Y. State 



Mas. Nat. Hist., p. 472, pi. 17 (18), fig. 5. 



Sponge slender, very gradually expanding, straight or slightly curved ; 

 cross-section circular. 



Surface smooth, annulated by a series of low, horizontal constrictions, 

 varying somewhat in depth, and much narrower than the successive swellings 

 of the cup. Over the basal portion of the cup the constrictions occur at much 

 mder intervals. 



Meticulum fine, without the strong predominance of any series of spicular 

 bands. The prevailing (piadrule appears to measure about 2x3 mm., and is 

 repeatedly subdivided. 



Dimensions. The original specimens are three in number and the best 

 of these has a length of 80 mm., and a width of 21 mm. On this specimen 

 there are five annulations in a length of 63 mm. A somewhat larger, more 

 completely flattened example retains nearly the entire cup, a portion of the 

 base being wanting. The original length of the cup was about 85 mm. ; the 

 diameter of its aperture 34 mm. This specimen bears but one constriction 

 and hence two annulations, the lower half of the cup being regularly conical. 



Localities. The orginal specimens are from a sandy shale of the upper 



Chemung group in western New York ; their precise locality, however, is not 



known. With them are associated the brachiopods Amhocoelia gregaria and 



Wiynchonella duplicata. The specimen represented on Plate xxii (figs. 3, 4) is 



from the lower beds of the Chemung formation at Deyo basin, Naples, 



Ontario county, where it is associated with Hydnoceras variahile and 



Hydriodictya cylix. 



Ceratodictta centeta, sp. nov. 



Plate xli, Figs. 1-5. 



A small colony of annulated Dictyosponges has recently been found in a 



soft sandy shale which was evidently deposited about the gro\ving cups so 



that the greater number of the specimens cross the sedimentation-lines of the 



rock at large angles, and have, in consequence, been variously compressed and 



