no CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



the upper Missouri beds it belongs to beds that are 

 regarded as Turonian in age. The members of the genus 

 that have been found in the Oregon basin are, at least in 

 two or three cases, closely allied to those of the upper 

 Missouri, with which they may have probably genetic rela- 

 tion. 



55. Scaphites gillisi, sp. nov. 



Plate III, Figs. 85-88. 



It is only after considerable study and comparison that 

 this fine little Scaphite has appeared to be entitled to a 

 distinct specific name. There are in the collections of 

 the University of California five perfect examples of S. 

 warreni M. & H. from the Upper Cretaceous of Dakota. 



In form and ornamentation the above species agrees so closely with 

 that from the upper Missouri that at first it seemed indistinguishable from 

 it except by its smaller size and generally smoother shell. The transverse 

 costae of S. warreni are not only sharper and stronger, but the lateral ridge- 

 like nodes are also more numerous and more prominent. In form S. gillisi 

 is more quadrate in outline, being at the same time proportionately longer 

 and narrower than the species of M. & H. As to the sutures in S. gillisi, 

 the lateral lobes are relatively wider and more developed; the first lateral 

 saddle is more deev)ly divided, and the siphonal lobe and its subdivisions 

 are both deeper and more strotigly incised. While in general the form of 

 the suture is very similar to that of .S". warreni, it is at the same time more 

 complex in detail. 



There will hardly be a doubt as to the near relation of 

 the species S. gillisi and S . -warreni, and whether identical 

 or not it serves to strengthen the connection between the 

 deposits of the Oregon basin and those of the Colorado 

 group, in which the latter is found, and to ally them both 

 to the Cenomanian. S. gillisi is more distantly related to 

 S. csqualis Sowerby, and agrees fairly well with some of 

 the types figured by StoHczka,^ except that the shell is 

 thicker in transverse section, is more quadrate in outline, 

 and has simpler sutures. It lacks the peculiar ventricose 

 development of the body-chamber seen in d'Orbigny's 

 figures, though in other respects there is considerable 



1 Pal. Ind., Vol. I, PI. I^XXXI, figs. 4 and 6. 



