124: NEW YORK STATE MUSEUM 



GLossoGRAPTus Emuioiis. 1856 



The author of the genus saw its distinctive chai'acters in the ligulate 

 outline and rounded extremities, as its name implies, but not in the presence 

 of the long spines, for he described in the same paper an equally spinous form 

 under Diplograptus. Hall [1865, p.43j did not recognize the genus, as, in his 

 opinion it is based on a species of Diplograptus Avith ciliate appendages on 

 the cell margins, " and no characters are given to show its generic distinction "; 

 and Freeh [1897, p.631 ] concurs with Hall in this view, stating that, as these 

 appendages show all gradations in the dipi'ionid graptolites and in Pristio- 

 graptus, they are not suited for generic distinctions. On the other hand, the 

 same author divides the species of the genus Diplograptus into two sections, one 

 "without and one with thecal sj^ines, considering the latter section as coin- 

 ciding with the genus Glossograptus, as defined by Lapworth. The latter 

 author [1878, p.504], however, has proposed to restrict the term to forms in 

 which, as in Emmons's type, not only is each theca furnished with two long 

 spines or fibers, extending outward from the angles of the aperture, but the 

 polypary itself is ornamented in addition with two opposite longitudinal rows 

 of gigantic isolated spurs, developed along the median line of the periderm 

 at right angles with the thecae. Elles [1898, p. 52 Iff] unites under Glosso- 

 graptus all diprionid species with long thecal spines, which indeed seem 

 to form a small characteristic group. We give the genus here the same 

 compass. 



Glossograptus hystrix sp. nov. 



Plate 16, figures 27-29 



Glossograptus sp. nov. Ruedemann. N. Y. State Paleontol. An. Rep't. 1902. 

 p.571 



Description. Sicula, nema and primary disk not observed. Rhabdo- 

 some small (4 . 5 mm length of largest specimen observed), relatively wide 

 (about 1 . 6 mm), with subparallel margins. Thecae closely arranged, num- 

 bering 20 in 10 mm, inclined at the low angle of about 25°, overlapping three 

 fourths of their length, exhibiting straight outer margins and straight 



