Logan.] The Invertebrates, Niobrara Group. 497 



A piece of fossil wood collected from the Niobrara beds near 

 Hays City contains the casts of forms very similar in general 

 character to the above-described species. The fossils occur 

 either in the uppermost horizon of the Fort Hays limestone or 

 in the lowermost horizon of Ornithostoma beds. 



Tusoteuthis, gen. nov. 



Gladius moderately convex, lanceolate, corneous in texture,, 

 having greatest breadth centrally ; inferior point obtuse,, 

 rounded, partly covered with a calcareous layer. Striation on 

 the surface of the gladius running parallel with the border. 

 Midrib at base broad and rounded. Shaft cylindrical, inclosing 

 a hollow cone ; striations in midrib run parallel with edges. 



The genus seems nearest related to Teuthopsis ( Zittel ) , but 

 differs from that genus in having a lanceolate instead of a 

 spatulate gladius, and a thicker, shorter shaft. It differs from 

 Phylloteuthis Meek and Hayden, in general shape and in not 

 being angular posteriorly as in this genus. 



Tusoteuthis longus, n. sp. Plate ex, fig. 1. 



Endoskeletal corneous portion composed of blade and shaft ; 

 blade moderately convex, with a midrib which is broad and 

 rounded at the base ; inferior point obtuse, rounded, and partly 

 covered with a calcareous layer ; striated, with striations run- 

 ning parallel with the border ; marginal border rounded. 



Shaft cylindrical, inclosing a hollow cone ; length of shaft, 

 120 mm. ; length of form, 520 mm. ; maximum breadth, 160 

 mm. ; diameter of shaft, 25 mm. 



The above genus and species are founded upon a single speci- 

 men from the Hesperornis beds of the Niobrara Cretaceous on 

 the Smoky Hill river, collected by Mr. Martin. Its discovery 

 was referred to by Professor Williston in his report on the Nio- 

 brara of Kansas in vol. n of the University Geological Survey. 

 The form was found imbedded in a matrix of chalk, and had on 

 the under side the contents of the ink sac. A part only of the 

 shaft was obtained, and a portion of the upper part of the 

 gladius near the central region is wanting. 



