43Q 



NEW YORK STATE MUSEUM 



distal part of theca (horizontal to slightly introverted) ; the apertural exca- 

 vation wide and deep in specimens preserved in relief, occupying one fourth 

 to one third the length of the theca and one third to two fifths the width 

 of the rhabdosome ; in compressed specimens narrower and deeper. 



The nemacaulus relatively thick (.2 mm). 



Position and localities. In Great Britain 



this species is widely distributed (Scotland, the 



Lake District, Shropshire, Wales and Ireland) 



and has a very long range, for it is already 



reported from the Ellergill beds in the Upper 



Skiddaw Slates (Elles) which are thought to 



correspond to the Llanvirn of Wales (Upper 



Arenig) in age and is there associated with 



forms occurring in our third Deepkill zone and 



below. Freeh even claims [1897, p.612] that 



Roemer has collected it near Christiania in Phyl- 



lograptus shale with Phyllograptus t y p u s 



and P. angustifolius. From the Llanvirn 



it ranges through the Llandeilo into the lower 



Caradoc [Lapworth, 1880, 1889] where it is one 



of the common forms of the C. wilsoni zone of 



the lower Hartfell shales and it is also well 



known in Scandinavia, where in Scania it is 



396^ reported from the zone of Diplograptus putillus 



Fig. 39.1-90 Climacograptus schar- \yy TullbeP'". 

 enbergi Lapworth. Fig. 394, 395 Copies ' ° 



of Lapworth's original ms drawings of British t \ • ■ 1 1 r 1 11 



specimens (x 9 and x 6^). Fig. 396 Well ill America it lias bedl Ill'St Observed b\" 



preserved specimen from Glenmont (not pre- 



^irnneVf^^R^^lrpMlm'^:,,,'^,^ Lapworth in collections from various outcrops 



F'g- 39 8 i 399 Two sides of fragment from . . „, 1 1 • l • e s~\ 1 



Mt Moreno, preserved in demirelief. x 5 OI the 1 reiltOIl shales 111 tliepi'OVince OI OuebeC 



(Griffin Cove and Island of Orleans, etc.) and Gurley has also listed it from 

 the " Upper Dicellograptus zone" at Magog, Canada. The present writer 

 found it in a specimen preserved in relief [see text. tig. 307 and Bui. 42. 49, 

 1 901 I associated with Am pyx (Lonchodomas) hastatus and 



