i.KAl'TOLl IKS OK NEW YORK, PART 2 



20I 



m 



rule, be traced for any considerable distance as maintaining its identity, for 

 as it bifurcates each bifurcation is often met by that from the adjoining two 

 branches and they, by uniting, form a single branch; at the outer margin 



the branches taper down and terminate in from two to more sharp points, 

 or serrations. 



Surface of the branches marked .by strong", irregular longitudinal 

 wrinkles, which at times seem to assume a semiscabrous character. Mar- 

 gins of branches rarely present a slight serration or roughness ; and in 

 places where portions of the black corneous branches have scaled off the 

 cast shows the obverse side to have the same character as the other. 



The openings in the network are of various sizes and shapes but mostly 

 oval or fusiform, no two being alike. 



The type specimen presents about one third of the circumference of a 

 circle and measures 9 cm from 

 the margin to as near the 

 center as is preserved and 

 which judging from the angle 

 of radiation of the branches 

 could not be more than 1 cm 

 further. 



There is some hesitancy 

 in placing this species in this 

 pfenus because all the forms 

 which we are acquainted with 

 are rather loosely branching 

 with few if any anastomoses 

 or reticulations. Still the 

 character of the branches so 

 closely resembles those be- 

 lonoino- to this s^enus that I 

 am constrained to place it 

 here. 



From the lower third of the shale at Lockport ranging as high as the 

 Homocrinus band. 



Only two fronds have been found in which the margin is preserved, 

 and both seem to represent portions of a quite regular circle. 



Ringueberg's figures, though representing but a small portion of the 

 rhabdosome, are correct and expressive of the characteristic appearance of 

 the form. We have inserted them here and further illustrated the form by 

 the tracing of a nearly perfect specimen [pi. 6]. 



Dr Ringueberg collected his types from the lower third of the shale at 



102 



103 



Fig. 102, 103 Palaeodictyota anastomotica (Ringueberg;). 

 Fig. 102 Copies of original figures. Fig. 103 Fragment of rhabdo- 

 some from the Rochester shale at Middleport, N. Y. 



