224 Kansas Academy of Science. 



thickened, ridged without; inner lip incrusted; canal short, a little 

 recurved; surface ornamented with very fine, revolving lines (there 

 are no signs of there ever having been any nodes on the shell). 



Dimensions: Height of shell to top of third whorl, measuring 

 from posterior extremity of canal, 57; to the top of the second 

 whorl, 49; to the top of the body whorl, 39; width of body whorl, 

 including varices, 42; of first whorl of spire, 37; aperture, 34x25. 



This species is distinguishable from H. californica Hds. by its 

 absence of nodes and rugose revolving ridges and non-denticulate 

 outer lip. 



A single spi^cimen of this species was obtained from the Quilla- 

 yute formation at the mouth of Maxfield creek by Mr. Henry Mar- 

 shall, who kindly presented it to the writer, and after whom it is 

 named. 



Superfamily Cerithiacea; Family LXXVIII NATiciDiE. 

 Genus Natica (Adanson) Scopoli. 



"Shell subglobular; spire slightly elevated; aperture half round; 

 spiral columellar callous entering the umbilicus. Natica canrena 

 Linn, is a characteristic species." 



Subgenus Cryptonatica Dall. 



''Natica with smooth calcarius operculum and an umbilicus 

 entirely and smoothly filled with callous. Natica clausa Broderip 

 and Sowerby is the type.'""* 



63. Natica (Cryptonatica) clausa Broderip and Sowerby. Plate VI, fig. 63; 



times, one-half. 



Natica clausa Brod. and Sby., Zool. Jour., vol. IV, 1829, p. 360. Zool. 

 Beechey's Voyage, p. 136, pi. XXXIV, fig. S- pi. XXXVII. fig. 6, 1839. 

 Carpenter, Brit. Assn. Rept., 1863. p. 661. Gabb, Pal. Cal., vol. II, p. 77, 

 1869. Tryon, Man. Conch., vol. VIII, p. 30, p'.. IX, figs. 65, 67-69, 73, 

 1886. Cooper, 7th Ann. Rept. Cal. St. Min., 1883, n. 253. Keep, West 

 Coast Shells, p. 46, 1892. Arnold, Mem. Cal. Acad. Sci., vol. Ill, pp. 313 

 315, 1903. 



Natica russa Gld., Proc. Bost. Soc. Nat. Hist., vol. VII, .1859, p. 43; Otia, p. 

 109, 1862. Carpenter, Brit. Assn. Rept., 1863, p. 586. Cooper, Bull. No. 

 4, Cal. St. Min. Bureau, part 3, 1894, p. 29. e-^ 



This species, as represented in the Quillayute formation, resem- 

 bles Lunatia leioisii very much, except that the adults are much 

 smaller and the spire more elevated in proportion to the size of the 

 body whorl. 



Shell ovate-globular; spire slightly elevated; whorls four, evenly 

 convex to shouldered occasionally; surface ornamented by incre- 

 mental lines only; suture depressed; aperture round-fcemioval to 



6.3. After Arnold. See above. 



