GRAPTOLITES OF NEW YORK, PART 



bicornis and Di cello or. sextans; and the Stockport specimens 

 occur with Diplogr. euglyphus and Climacogr. parvus. 



Remarks. The principal distinguishing- features of this variety are the 

 small axillary angle and the extension of the strong spines upon the begin- 

 ning of the uniserial branches [see fig. 24;]. The axillary angle is in the 

 specimens from Glenmont and Mt Moreno still considerably smaller than in 



Fig. 243-48 Dicranograptus nicholsoni var. parvangulus Gurley. Fig. 243-45 Gurley's original 

 nanuscript) figures. The original of figure 243 is from Stockport, N. Y.; those of figu 



gures 244 and 245 are from Arkansas 

 (all three in National Museum). Figure 245 is enlarged x 2 ; the preceding are natural size. The originals of figures 247 

 to 248 are from Glenmont, N. Y. Figure 248 shows the sicula with virgella and the septum ; ihe two other figures the 

 character of the thecae. x 5 



the Arkansas and Stockport examples and reduced to 20 [see pi. 21, fig. 2, 

 text fig. 248, etc.] and less, but quite constant in all the specimens and thereby 

 guaranteeing the constancy of the variety. Otherwise they fully agree with 

 Gurley's type specimens. Gurley has remarked [1896, p. 73] that D. whiti- 

 anus Miller differs from this variety only in having all the thecae on the 

 branches spinose, and that he would have united the two, if D. whiti- 

 anus did not rest upon a single specimen from a distant locality (Nevada) 



