364 



the last in having the posterior side rather distinctly truncated, iastead 

 of being* narrowly rounded. It seems to be also a proportionally shorter 

 shell, while the oblique depressions (in casts) behind its beaks are 

 deeper and more defined. 

 Locality and position. — Same as last. 



GASTEEOPODA. 



G-enus DENTALIUM, Limijeiis. 

 Dentalium Komooksense, Meek. 



Plate 3, fig. 6. 



JDentaliuin KomooJcsense, Meek (1857), Trans. Albany Institute, iv, 44. 



Shell of medium size, slightly arcuate, and rather distinctly tapering, 

 comparatively thin ; section circular. Surface ornamented by elevated 

 longitudinal lines or small costa?, of which about sixteen may be counted 

 near the smaller end, where they about equal the depressions between 

 them in breadth ; farther up (toward the larger end), there is between 

 each two of these costfe an intermediate smaller one developed. On 

 following all these costae to near the middle of the shell, they are seen 

 all to become of nearly uniform size, less distinctly defined, and propor- 

 tionally more closely arranged. The lines of growth are very fine, 

 obscure, and pass around rather obliquely. 



Diameter near the smaller end, 0.05 inch, and increasing to 0.10 inch 

 in a length of 0.50 inch. 



This species is nearly related to 2>. gracile of Hall and Meek (Memoirs 

 Am. Acad. Sci. and Arts, Boston, vol. 5, p. 393), from which it may be 

 distinguished by its thinner shell and more slender form as well as by 

 its less distinct lines of growth. 



Locality and position. — l^anaimo?, Vancouver's Island; Cretaceous. 



CEPHALOPODA. 



Genus BACULITES, Lamarck. 

 Baculites Chicoensis, Trask*? 



Plate 4, figs. 2 and 2 a, b, c. 



BaciilUes C/itcoensis, Trask (1856), Proceed. San Francisco Acad. Nat. Sci., 85, pi. 2, 

 fig. 2.— Gabb (1864), Report Geol. Survey California, vol. i, 80, pi. 14, figs. 27, 

 29, and 29 a, and pi. 17, figs. 27 and 27 a. 



Baculites inornatus, Meek (1861), Proceed. Acad. Nat. Sci. Philad., xiii, 316. 



Compare Baculites ovatus, Say. 



Shell apparently attaining nearly a medium size, straight, very grad- 

 ually tapering, with a regularly ovate section, the antisiphonal side being a 

 little more broadly rounded than the siphonal ;* lateral sinuses of the lip 



* Until recently, the outer or siphonal side of the Jmmonitoid forms has been generally 

 called the dorsal side, and the inner the ventral. From the position of Nautilus in its 

 shell, however, it has been, with good reason, inferred that the outer side of the Am- 

 monites is really the ventral side. By analogy, we may also infer that the siphonal or 

 narrow side of the Baculites is the ventral side. I have therefore so considered it, and, 

 to avoid confusion, described what used to be called the dorsal lobe as the siphonal 

 lobe, and merely referred to the lateral lobes and sinuses on each side as "first 

 and second lateral lobes and sinuses". I have also applied the same nomenclature to 

 the Ammonites, merely counting the nvmher of the lateral lobes and sinuses, whether 

 many or few. 



