Dc!<rrlj)ti()iis of Sjicclcs. 37 



marking they correspond to the N. aadiaeiisls o( lloenier, origi- 

 nally collected from the Caprina limestone near Austin. 



The Ner'meas do not occur in the Comanche series higher tiian 

 the Caprina limestone of the Fredericksburg Division and not at 

 all in the Upper Cretaceous, where Roemer erroneously supposed 

 this species (originall}^ collected by Mr. Stolley) to occur. 



Neiitiiia t^p. indet. 



A cliaractcristic fossil of the beds at the base of the Glen Rose 

 subdivision is a small Ncril'ni'i. Unfortunately the writer's speci- 

 mens were lost- in the removal of his collections to Washington, 

 but there are others in the United States National Museum, 

 which he collected- from Hood county for the United States (leo- 

 logical Survey in 188G, and it is hoped that they will l)e figured 

 and described. 



Tins form occurs throughout the basement l)eds in Arkansas 

 and in Hood and Parker counties, Texas. 



Neumayiia walcotti Hill. 



Plate VIII, Figs. 1, 2, 3. 



AiHiiionUc-i walcotti Hill (not Sowcrliy). Annual Report Ge- 

 ological Survey of Arkansas 1888, vol. ii, i). 139, plate i, figs. 1, 



Nikitin (Mem. dc I'Acad. St. Petersburg, 1881), defines tliis 

 genus as follows : 



Shell flat, widely und)ilicate; convolutions tliinly rounded, 

 marked by fine falcate lines; lobes and saddles low, slightly 

 incised ; siphonal lobes longer than the first laterals ; the two 

 lateral and accessory lobes little develojied. 



Only one specimen of this species has thus far been discovered. 

 It occurred in association with 0. frdnklini, ViicarUi lajdui, 

 Eriphyld. arkansaeasi.% and other mollusks herein described. 

 The form very much resemldes in outward appearance the fig- 

 ures of the genus Oxj/iiotici nix of Hyatt, as given by Zittel 

 and Steinman in their Manuals, ))ut Professor Hyatt refers to it 

 to XcaiiKijjrid, and ccnitriljutes the following comments u[)ou the 

 specimen : 



" Your Ammonites ivalcottl is probably a Neumnyrhi. The as- 

 l)ect is Jurassic, but this group, Upper Jura, and the species 



