9.38 



NEW YORK STATE MUSEUM 



Clonograptus proximatus Matthew ( Staurograptus di- 



chotomus Emmons) cc 



Clonograptus cf. milesi Hall p 



Bryograptus lentus Matthew c 



B. spinosus Matthew c 



B. patens Matthew c 



Acrotreta bisecta Matthew r 



A. cf. belti (Davidson) Matthew r 



Notes on fossils 



The Protospongia occurs mostly in large spicules (or bundles 

 of spicules), consisting of pyrite and limonite, the four branches 

 measuring 10 mm and more. Walcott has figured spicules of 

 smaller size but like form from the upper portion of the Olenel- 

 lus zone in Washington county, N. Y., and pointed out their 

 similarity- with Prostospongia fenestrata Salter. 

 Patches of sponge tissue have been found, composed of rhom- 

 bic meshes of nearly half an inch wide and thereby reminding 

 one of the gigantic form Palaeosaccus dawsoni Hinde, 

 from the base of the Levis beds. As a large surface of the bed 

 containing these sponges is accessible, a further exploitation of 

 the same in another season will probably furnish sufficient 

 material for an exact determination of the relation of this 

 sponge to the form mentioned and to the species described by 

 Dawson from the Lower Levis beds at Little Metis. 



Dictyonema flabelliforme Eichwald. There is some variation in 

 the expression of the forms, and some of the varieties which 

 have been recognized in other localities may also be discernible 

 here. The great majority of the specimens however are clearly 

 identical with Dictyonema flabelliforme Eichwald, 

 forma typica, as it has been described by Kjerulf and Brogger. 

 This is evinced by the rather open long meshes and the thin, 

 slender dissepiments. Quite a number of forms possess rather 

 fine meshes and may be comparable to the variety conferta 

 Linnarsson. The mutation norvegica, which is said by 

 Brogger to lie in a higher level at Vakkero, and which is char- 

 acterized by small, short, angular meshes and thick connecting 

 dissepiments, is not represented in the Schaghticoke fauna. 

 The varioly a c a d i c u m , which was recognized by Matthew 



