554 NEW Y0RK STATE MUSEUM 



TLATE 30 



Genus lasiograptus Nicholson 



See plates 2S, 30 



Lasiograptus mucronatus (Hall) 



See plate 29, figures 9-11; plate 31, figures 1-3 

 Page 479 



1 Specimen showing the network of finer extrathecal fibers 



Normanskill shale, Mt Moreno near Hudson, N. Y. 



2 Macerated specimen, retaining the horizontal ledges of the periderm 



3 Enlargement of portion of Hall's type of decade 2, plate B, figure 8 



Normanskill shale, Kenwood, N. Y. 



4 Small specimen showing distal connection of fibers 



5 Another specimen, showing same feature and connection of bases of 



fibers by periderm 



Normanskill shale, Mt Moreno near Hudson, N. Y. 



Lasiograptus bimucronatus Nicholson 



See plate 29, figures 9-11; plate 31, figures 1-3 

 Page 48t 



6 Large macerated specimen retaining portions of the extrathecal periderm 



7 Frontal aspect of rhabdosome, with few fibers 



8 Specimen, retaining the triangular processes, their bounding fibers and 



cross fibers 



Normanskill shale, Mt Moreno near Hudson, N. Y. 

 All figures are enlarged x 5. The original of figure 3 is in the 

 American Museum of Natural History; the others are in the New 

 York State Museum. 



