112 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



umbilicus in the younger coils is wide, the whorls being little involute and 

 almost circular in section. With increasing age the whorls become more 

 clasping, until at maturity the umbilicus is almost, though never entirely, 

 closed. The ribs form at a diameter of about .8 cm. 



The suture line is simple, consisting of but few bifid lobes and saddles, the 

 latter of which are rounded in their smaller divisions, and in general outline, 

 while the former are narrow and pointed. 



Occurrence. — This species was collected with the follow- 

 ing at the Forty-nine Mine, near Phoenix, Oregon. Its 

 horizon is equivalent to that of the Lower Chico of the 

 Sacramento basin. 



The type is in the collections of the California Academy 

 of Sciences. 



The species is named in honor of Professor Thomas 

 Condon of the University of Oregon. It is with pleas- 

 ure that a tribute of recognition is thus offered for the 

 deep interest and devotion to geological study which 

 has so often been a source of inspiration alike to students 

 and acquaintances. 



57. Scaphites condoni var. appressus, sp. et var. nov. 



Plate II, Figs. 64-66. 



This shell is quite evidently a variety of the preceding, 

 and it will be only necessary to mention here its points of 

 difference. 



In general it has a thinner and more compressed form. The transverse 

 ridges and constrictions upon the body-chamber are farther forward than 

 those upon the type of the species, and have, moreover, a decidedly obHque 

 tendency. The transverse ribs upon the coiled portion of the shell are 

 scarcely to be seen. The suture line seems to be a little more developed, or 

 complex, in its details, but otherwise is identical with that of the type. 



Occurrence. — The position and occurrence of this shell 

 is the same as that of the preceding. 



The type is in the collections of the California Academy 

 of Sciences. 



58. Scaphites roguensis, sp. nov. 



Plate II, Figs. 67-70. 



Shell small, discoidal, flattened on sides, quadrate in section; umbilicus 

 small in adult shell, relatively wider when young; surface of shell nearly 



