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NEW YORK STATE MUSEUM 



region. In the second specimen (figure 22), from the same locality, 

 which is 46 mm long, 9.4 mm wide at the wider end, and 5 mm at 

 the narrower one, thirteen brown longitudinal bands can be seen on 

 one half, while the other is entirely free from them. These lines, 

 corresponding to the smaller size of the specimen, are but .3 mm 

 wide at the thicker end and separated by interspaces .5 mm wide. 



Fig. 24 



Fig. 25 



Figs. 21-25 Geisonoceras tenuitextum (Hall). Figs. 21 and 22 

 Lateral views of specimens (fig. 21 natural size, fig. 22x2), showing color bands 

 on upper side. Fig. 23. Portion of specimen, showing the black mud 

 filling shaded. x2. Fig. 24 Dorsal view of specimen, natural size. Fig. 

 25 Section of color-bands. 



In the third specimen, from Middleville, seventeen color bands are 

 counted on one side, while there are none on the other. These bands 

 are i mm wide, where the conch is 19 mm wide, and separated by 

 interspaces, .5 mm wide. The color of the bands is light brown at 

 the narrower end, where the conch is filled with crystallized secondary 

 limestone, and black in the other portion where the conch is filled 



