SpKCIES ok TlIK CllKMlIXO GitOUP. 77 



This is our largest species of the genus, and doubtless its gi-eat size is in 

 itself the principal occasion of so delicate a structure 1)eiug retained only in 

 this highly fragmentary state. 



Locality. Almond, N. Y. (Collection of E. B. Hall.) 



DiCTYOSPONGIA (?) BACTERIA, Sp. HOV. 

 Platk xxxviii, Figs. 7, 8. 



This is a slender, nearly cylindrical sponge, which, in the entire length, 

 shows but slight indication of tapering in either direction. Oi-iginally its sur- 

 face" was doubtless smooth and this aspect is modified in the fossil only by 

 some low casual corrugations and indentations. The substance of the skeleton 

 was extremely thin as shown in transverse section and is i-epresented by a 

 tenuous ferruginous film. Under favorable light there is evident an extremely 

 fine transverse lineation of the siu"face but vertical striation is extremely 

 obscure. The fossil has a quite different aspect from the other species of 

 DiCTYOSPONGiA here described and while there is good reason to regard 

 it as of this genus, it may prove to be of a somewhat different nature. 

 Small patches of iron oxide on the surface of the specimen show actinic spots 

 which, though failing to resolve under high magnification, suggest that these 

 may be parenchymal or dermal spicules. 



The length of the specimen illustrated is 110 mm. and is incomplete. 

 Its width is 12 mm. at each extremity and 15 mm. in the middle. 



Locality. From a calcareous sandstone in the upper Chemung fonnation, 

 associated with numerous brachiopods : Spirifar disjiiiictas, OrtJiotheten Clie- 

 mmigemis, Stroplieodonta demima var., Frodtbctella lachrynwsa. The precise 

 locality of the specimen is not known, but it is probably from Steuben county. 



HYDRIODICTYA, gen. nov. 



1884. Dictyophytoii, Hall. Thirty-fifth Ann. Eept, N. Y. State Mus. Nat. 

 Hist., p. 469. 



Simple, broadly expanded, vase shaped cups without nodes, ridges or 

 other conspicuous surface characters, and with no apertural spiculai* fiinge. 

 Type, Biciyophytoii patalwm, Hall.  



