272 



NEW YORK STATE MUSEUM 



from the Normanskill shale at Kenwood. 1 The New York State Museum 

 also contains a specimen from the same horizon at Glenmont, N. Y., which 

 is associated with Nemagr. gracilis and Climacogr. parvus. 

 In Great Britain this species is recorded from a much higher horizon (zone 

 of Pleurograptus linearis of the Hartfell shales). It would there- 

 fore seem to have been a long range form. It is of rare occurrence here 

 and also in the Scottish beds. 



Remarks. This is the sole repre- 

 M sentative of the peculiar genus Amphi- 

 graptus in our shales and with our pres- 

 ent knowledge, in America. Its paired 

 secondary branches are its most peculiar 

 character. The mode of branching by 

 which this apparently paired arrange- 

 ment of the branches is produced, is 

 too much obscured by the close bud- 

 ding to be observable. 



The branches are so little com- 

 pressed that they appear as tubes, where 

 all other graptolites are completelv rlat- 



Fig. 187-90 Amphigraptus divergens (Hall). 01 1 J 



Fig. 187 Copy of original figure. Fig. 188 Enlargement of . 1 t^i • 1, r .i • 



sicular or central portion of type. Jig. 190 Enlargement tened Ollt. lillS TeSLUtS trOlll their 



of branch of same. Fig. 189 Portion of branch of other 



specimen. x S having been provided with an excep- 



tionally thick periderm. To the latter fact the straight and rigid appear- 

 ance of the branches, so characteristic of the form, is also due. 



Amphigraptus multifasciatus (Hall) 



Plate 15, figure 4 



Graptolithus multifasciatus Hall. Pal N. Y. v. 3, sup. 1S59. p. 508; p. 509, 



fig. 8 



Graptolithus multifasciatus Hall. N. Y. State Cab. Nat. Hist, uth An. Rep't. 



1859. p.56; p. 57, fig. 8 



1 In Memoir 7 this form lias been erroneously cited as occurring in the Quebec shales 

 of Point Levis \Ibid. p. 701]. 



