CRETACEOUS FOSSILS. 75 



two smaller ones, notched at the ends. Superior lateral lobe 

 bifurcate ; each branch divided into two processes at the end and 

 a lateral one above ; above the origin of these branches are a 

 large and a small spur on each side. Lateral saddle like the dor- 

 sal, except that it is wider at the top and narrower at the bottom. 

 Inferior lateral lobe like the superior, but smaller. Ventral saddle 

 smallest, of the three. Ventral lobe deeply trifurcate at the tip 

 with two lateral spurs. 



Figures, natural size. 



Locality: A single specimen from the lower division (A.), at Pence's Ranch, 

 Butte County. 



CRIOCERAS, Lev., D'Orb. 



0. (ancyloceras ?) Remondi, n. s. 



PI. 14, Fig. 24, and 24 a. 



Discoidal ; whorls increasing rapidly in size, flattened on the 

 sides ; dorsal surface narrow, convex; ventral, flat or very slightly 

 concave. Transverse diameter less than half the dorso-ventral. 

 Space between contiguous whorls narrow, but well marked. Sur- 

 face marked by numerous small flexuous ribs, of about equal 

 size, which arise on the ventral margin of the whorls and pass 

 entirely across the back; these ribs are often dichotomous, and 

 occasionally, though rarely, anastomose near the dorsum. In one 

 case, remains of a few small dorsal spines were observed. These 

 were placed in two rows, one on each side of the back. The 

 ventral surface is finely striate transversely, the striae arching 

 forwards. Of the septum, I have only been able to see the dorsal 

 and superior lateral lobes and their corresponding saddles. I 

 have not been able to detect any difference other than that of 

 size and consequent complexity between this and the one figured 

 on pi. 15) fig. 30 a; except that the dorsal lobe is somewhat 

 shorter relatively in the present specimens. 



Locality: North fork of Cottonwood Creek, Div. A. Named in honor of Mr. 

 Uemond, who collected all the specimens 1 have Been. 



