440 



A. W. GRABAU THE SHEEBURXE SAXD5T0XE 



Table II — continued 



Crjstacea 



122. Mesothvra oceani HEiil 



123. Phacops rana Hall 



1 



■ 1 



c: 



1 



1 



3 

 7 



r 



5 



1 



1 



X 



X 



z 



1 



6 



7 



1 



1 

 8 



V 



Echinodermata 



124. Arihracantha itnacaensis H. S. W 



125. Poteriocriniis clarkii var. alpha H. S. W 



126. P. coTueUianus H. S. W. ." 



127. P. tDecadocrinust gregarius H. S. W. . . 



128. P. yDecadocrinus) zeihiis H. S. W 



129. Taxocrinus curius H. S. W 



130. r. iihacaensis H. S. W 



131. r. iihacaensis var. alpha H. S. W 



r 



Pisccs 



132. Dipterus iihacaensis H. S. W 



Plantae 



133. Plumiilina plumidaria Hall. . . 



134. Lepiodendron sd 



13a. Psilophyton princps Dawson. 

 136. Radiop'tiris punctata Dawson. 



L rc — — — 



It will be observed tiiat out ot a total of 45 species recorded ior tiie 

 Sherburne or Lower Portage of the Ithaca region. 13 are Hamilton 

 forms, but only 8, or a little less than IS per cent of the whole, occur also 

 in the eastern Sherburne. Of these, 6, or 75 per cent, -are typical Hamil- 

 ton species and onlv 2, Modiomorpha suhalata chemungensis and Liorhyn- 

 clius mesicostalis, are super-Hamilton types. The first of these is a 

 single specimen of a shell '"larger and longer . . . than any of the 

 fioTires of the . . . species'" . . . found with a Hamilton fauna 

 1T5 feet above the last occurrence of a typical Hamilton fauna in :Mary- 

 land township, Otsego Coimt}-. The other is represented by several speci- 

 mens from sandstones 100 feet above beds with a typical Hamilton fauna 

 near Schenevus, also in Otsego County. It is not impossible that these 

 mav both be in the base of the Ithaca, a part of what has been classed as 

 Upper Hamilton being actually basal Sherburne. 



-Dominant species of Ithaca formation at Ithaca, called by Williams 

 speciosa fauna" (Williams. Bull. V. S. Geol. Survey. 210. p. 74 1. 



•Prodiictella 



