CKAl'TOI.lTES OF NEW YORK, PART 2 



445 



one half; with very prominent mucronate extensions of outer wall ; aperture 

 perpendicular to axis of theca, without appendages. Nemacaulus strong, 

 sometimes inflated. 



410 



V 





412 



i4« 



Fig. 410-17 Cryptograptus tricorn: 



415 Y 416 



(Carruthers). Fig:. 410 Copies of Hall's original figures of 



r lg. 410-17 tryptograptus tricorn ij ^arrutners). rig. 410 copies 01 nans o „ 

 Graptolithus marcidus. Fig. 411-16 Various aspects of rhabdosomes. Fig. 414 An oblique view, in 

 which the depressed parts of the ventral walls look like apertures. Fig. 415 A frontal view in which the aper- 



Position and localities. Lapworth records this species as " very numer- 

 ous in the Glenkiln and lower Hartfell shales of the south of Scotland," and 



