72:1 MOW VOUK STATE MUSEUM 



oLossoGRAPTus Emiuons. 1856 



The author of the geuiis saw its distinctive characters 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 papei' an equally spinous form 

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

 opinion it is based on a species of l)iplog]'a[)tus Avith ciliate appendages on 

 the cell margins, " and no characters are given to sho^v its generic distinction "; 

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

 appendages shoAv 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 spines, considering the latter section as coin- 

 ciding with the genus Glos8ogra[)tus, as defined by Lapworth. The latter 

 author [1873, p.504j, 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.521ff] 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 



Glo860graptu8 sp. nov. RuedemanQ. N. T. 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 mai-gins. 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 outei- margins and straight 



