1897.] NEW YORK ACADEMY OF SCIENCES. 271 



Glyphioceras spn.?;Ricus Martin. (?) 

 PI. XXL, figs. 1-2. 



1809. Gonchyliolithus NautUites (sphsericus), Martin, Petrif. 



Derb., PL 7, figs. 3-5. 

 1812. Ammonites sphsericus, Sowerb}-, Min. Couch, Vol. 1, p. 



116, Tab. 53, fig. 2. 

 1836. Goniatites sphsericus^ Pliillips, Geol. Yorks,, pt. 2, p. 234, 



PI. 19, figs. 4-6. 

 1880. Goniatites sphasricus, de Konnick, Faune de Gale. Garb. 



de La Belg., pt. 2, p. 47, PI. 47, figs. 3-5. 

 1 882. Gontatites crenistria, Barrois, Rech. Sur les. Ferr. Anc. 



des Ast. et de la Gal., p. 292, PI. 14, fig. 1. 

 Shell compressed globular, umbilicus small. Surface orna- 

 mented with longitudinal lines to the number of about nine in 

 the space of one-fourth of an inch. 



Ventral lobe of the suture minute and acutely angular, situ- 

 ated in the apex of a larger ventral saddle, which is thus divided 

 at its apex into two small and acute siphonal saddles. Primar}' 

 lateral lobes acutely angular with more or less undulating sides. 

 Primarj' lateral saddles large and acute, much higher than the 

 two small siphonal saddles, the base broad, about two-thirds 

 the height, the point slightly inclined towards the umbilicus. 

 The second lateral lobes much larger than the first, as large or 

 larger than the primary lateral saddles, the sides undulating. 

 The second lateral saddles regularl}' rounded or with a single 

 undulation, extending to the umbilicus. 



All the Batesville specimens are imperfect and more or less 

 crushed, but so far as the suture is concerned they agree exactly 

 with the figures and descriptions of European examples, ex- 

 cept that the bifid ventral saddle is narrower and more elevated. 

 The Arkansas specimens also difl!"er from the latter, in being more 

 compressed laterall}^ and less globose. In Professor Bar- 

 rois'* notes on the species from Spain, he mentions its varia- 

 bility' in this respect and saj's that all intermediate stages occur 

 between the globose and the compressed forms. The Arkansas 

 specimens exhibit considerable variation in this respect, but none 

 of them attain the extreme globosity of the European speci- 

 mens. 



The species is also closely related to Goniatites kentuckiensis 



* Barrois describes the species under the name Goniaitites crenestria, considering 

 that to be synonymous with G. sphfrricus. Whether he is right or not is of no conse- 

 quence here, but it would seem that in any case Martin's name, published in 1809, 

 would take precedence over Phillips', which was not published until 1836. 



