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



nodes or tubercles shown; suture line complex, consisting of six lobes and 

 six saddles, each bifid, and showing the same tendency in all of the smaller 

 divisions; both lobes and saddles widely branching, the former terminating 

 in sharp denticular points, while the latter become more rounded in their 

 terminations. The siphonal lobe is bipartite, with diverging branches, each 

 of which is further divided, and above which is a smaller, secondary spur or 

 branch. The antisiphonal lobe is more simple, consisting of an elongated 

 and irregularly toothed neck, tripartite in its termination. The first lateral 

 lobe is wider, though not quite so long as the second, and more regularly 

 divided. The second lateral saddle is both broader and higher than the first 

 one, and in its location occupies the middle of the rounded side. A single 

 constriction is to be seen upon the fragment found, though it is not clear that 

 this is not accidental. It consists of a broad and flattened depression (7.5 

 mm. in width) upon the sides and ventral edge, which is not altogether regu- 

 lar in its form. In front it is bordered by an oblique, rounded constriction 

 one millimeter wide, against the posterior side of which terminate four or five 

 of the preceding ribs. The succeeding ribs are thus set at an angle which 

 places them not quite parallel with those preceding this broad depression of 

 the sides. 



Occurrence. — Forty-nine Mine, near Phoenix, Oregon. 

 The type is in the California Academy of Sciences. 



28. Hamites phoenixensis, sp. nov. 



Plate III, Fig. 104. 



Shell small, cylindrical in section, bent in one plane into a hook-like curve; 

 surface ornamented with slightly oblique, transverse ribs inclining a little 

 forward in passing from the inner to the ventral side of the whorl; ribs a 

 little stronger on the ventral than upon the dorsal side, some rising consider- 

 ably above the rest in approaching the ventral surface; whorls crossed at 

 intervals by small rounded constrictions, not distinctly shown in the figure. 

 The ribbing is not (juite regular in the vicinity of the reflex curve, and there 

 seems to be a slight deviation from a true plane in this portion; and this seems 

 to be still further indicated by the ribbing, which is not quite symmetrical at 

 this point. 



The septation of this species is not known. In its form 

 and sculpture, except for its lack of tubercular ornamenta- 

 tion, it resembles Hamites royerianus d'Orbigny, which is 

 said to come from the Neocomian of Europe; and in all 

 respects except size it resembles H. cylindraceus, as figured 

 by Whiteaves, from the Sucia Islands. It may be a small 

 representative of this western species. 



Occurrence. — This species is from the Lower Chico beds 

 of the Forty-nine Mine, near Phoenix, Oregon. 



The type is in the California Academy of Sciences. 



