710 NEW YORK STATE MUSEUM 



The sicula has not been observed in an}- of the writer's specimens, nor has 

 the sicular process, which according to Hall attains a length of about ^ inch, 

 been noticed. 



Position and localities. In the Deep kill P . t y p u s has been found 

 sparsely, in rather large specimens at the base of graptolite bed 3 ; and in 

 great number, but in smaller size, in the intercalations in the quarry, belong 

 ing to the same zone (zone with Didymograptus bifidus). 



According to its citations in the literature this species could be con- 

 sidei-ed as one of the most widely distributed ; it is, however probable 

 that some of the graptolites which have been identified with it belong 

 to other species. So for example, the monographers of the British grapto- 

 lites have not been able to identify positively the material currently cited 

 in Great Britain as belonging to P . t y p u s with that Quebec species. 

 And also in Sweden in later time, the investigators have not felt justified 

 in doing more than to characterize the uppermost zone of the lower grapto- 

 lite shale as the zone with P . of. t y p u s Hall. Gurley, further, refers 

 with doubt a form from Arkansas to this species. 



Hall's types came from the beds at Point Levis. As no associated 

 fonns are cited, it is uncertain whether these types were collected in the lower 

 or upper Point Levis zone. From its associates in the Deep kill we suppose 

 that this species belongs in the upper part of the lower horizon. Ami 

 lists it from several localities near Point Levis, in association with fonns 

 of the Tetragraptus zone. Billings recorded it from the Cow head on 

 Newfoundland. The specimens referred in Great Bntain to the same 

 are found in the upper beds of the Middle Skiddaw slates of the Lake 

 district. Toruquist and Tullberg identify forms in Scania with it and 

 Brogger mentions it as common in the shales at Christiania. It also has 

 been collected by Cluysenaar and Lecrenier at Huy-Statte in Belgium and 

 listed as Diplograpsus folium, the identification having been cor- 

 rected by Malaise. 



McCoy records it from numerous places in Victoria, Australia. 



