EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 2I9 



as F. helderbergiae and 1*". niagarensis save in external form, 

 the former being lenticular and the latter spherical or clavate. 



Localities. Shore outcrops from Grande Greve to Indian Cove. 



Favosites sp. 

 Probably Fa V o s i te s cervicornis Logan. Geology of Canada. 1863. p. 393 

 This is a tuberous or branching species, less common than the foregoing 

 and the specimens thus far examined are insufficient for determination. 

 Locality. Grande Greve. 



Pleurodictyum lenticulare Hall 

 van laurentinum nov. 



PKite 48, figure i 



Pleurodictyum lenticulare' is a species of the Helderbergian 

 (New Scotland) fauna characterized by its very large and few cells, the walls 

 of which are strongly marked by nodose and broken septa. A central cell, 

 hexagonal in form, is bounded by six others and it often happens that the 

 development of this species does not pass the primitive expression. The 

 form before us has the same form and size of cells which are marked by 

 radial nodose and denticulated septa, these being most prominent and most 

 irregular at the base. The lenticular corallum however grows to larger size, 

 showing three cycles of cells about that which may be taken as central. In 

 the measurements of the cells the New York and the Gaspe forms are alike. 



Locality. Grande Greve and Perce Rock. 



Striatopora cf. issa Hall 



C/. Striatopora issa Hall. N. Y. State Mus. Nat. Hist, 26th An. Rep't. 



1874. p. 114 

 Cf. Striatopora issa Hall. Palaeontology of New York. 1887. 6:6, pi. 3, 



fig- 14, 15 

 A few fragments show the presence of this genus and perhaps of the 

 species suggested in the upper beds at Grande Greve. 



GRAPTOLITES 

 Dictyonema cf. splendens Billings 

 Represented by a few fragments from Grande Greve. 



Chaunograptus gracilis nov. 



Plate 4S, n.i,Mires 3-:; 



A shell of Le p to s t r o ph i a magnifica has affixed to it an 

 irregularly branching black conchioJinous repent fossil which in structure 



^ See Michelinia lenticularis Hall. Palaeontology of New York. 6 : 7, 

 pi. 3, fig. 1-3, 5. 



