56 



NEW YORK STATE MUSEUM 



All of these with the exception of nos. 6, 9, 12, 13 and 14 are from the 

 Rochester shale of New York where they have been found in several 

 localities, notably at Lockport and Middleport. Dictyonema a r e y i 

 has been obtained only at Rochester. The greater part of the Rochester 

 shale species of New York, viz, nos. 1, 2, 3, 4, 7, 8, 10, is also found in the 

 limestone at Hamilton, thereby indicating- the essential unit)- of the grapto- 

 lite faunas of our Rochester shale and the Niagaran limestone at Hamilton. 

 The latter has furnished a wonderfully varied fauna of dendroid graptolites 

 which have been collected with untiring enthusiasm by Colonel Grant and 

 described by Professor Spencer in several publications. L)r Gurley in his 

 manuscript revision of the Dendroidea has still increased the number of 

 species from Hamilton. Dr Spencer's list of Hamilton species is : 



Phyllograptus ? dubius Spencer 1 

 Acanthograptus granti Spencer 

 A. pulcher Spencer 

 Callograptus granti Spencer 

 C. minutus Spencer 

 C. multicaulis Spencer 

 C. niagarensis Spencer 

 Calyptograptus cyathiformis Spencer 



C. micronematodes Spencer 

 ? radiatus Spencer 

 subretiformis Spencer 



Cyclograptus rotadcntatus Spencer 

 Dendrograptus dawsoni Spencer 



D. simplex Spencer (preoccupied=S. dubius 

 Miller) 



D. frondosus Spciucr 

 D. praegracilis Spencer 

 D. ramosus Spencer 

 D. spinosus Spencer 



Dictyonema expansum Spencer 



D. gracile Hall 



D. pergracile Hall 6° Whitfield 



D. splendens Billings 



D. tenellum Spencer 



D. websteri Hall 



Ptilograptus foliaceus Spencer 



Rhizograptus bulbosus Spencer 



Inocaulis bellus Hall 6° Wlu'ificld 



I. eervicornis Spencer 



I. diffusus Spencer 



I. divaricatus Hall 



I. phycoidcs Spencer 



I. plumulosus Hall 



I. ? problematicus Spencer 



I. ramulosus Spencer 



I. walkeri Spencer 



Thamnograptus bartonensis Spencer 



T. ? multiformis Spencer 



D. (Chaunog.) novellus Hall 



This grand outburst of Dendroidea in the Upper Niagaran bods is, 



1 Not a graptolite 



