THE NAUTILUS. 



the adults later received from Mrs. E. P. Chace were brownish. 

 The relations of this group to Myrina remain to be cleared up. 



ADULA FALCATA Gould. 



Lithodomus falcatus Gould, Proc. Boston Soc. N. Hist, iv, p. 

 92, Nov. 1851; Monterey, Cal.; Gulf of Cal. Shells, Apr. 1852, 

 p. 30, pi. 6, fig. 9. 



Lithodomus gruneri Reeve, Conch. Icon. Lithodomus, 1857, pi. 

 iii, fig. 12. "New Zealand" in error. 



Lithodomus (Lithophaga) falcatus Gould, Otia. Conch., p. 213, 

 1862. 



Adulafalcata Dunker, Conch. Cab. neue Aueg., viii, pt. 3, 

 Lithophaga, p. 22, pi. 4, figs. 1, 2, 1882. 



Distribution. Straits of Fuca to San Diego, Cal., and south- 

 ward, boring in indurated clay and soft sandstone. 



This is the largest of the genus and distinguished from either 

 of the other Californian species by its much greater length and 

 the sculpture of the periostracum. 



POLYGYRA BREVIPILA CHEROKEENSIS, NEW SUBSPECIES. 



BY GEO. H. CLAPP. 



Differs from typical brevipila (NAUTILUS, xx, p. 110) by its 

 uniformly smaller size and darker color. In both these respects 

 it resembles cohuttensis, for which it might be taken at first 

 sight ; but the form and details of apertural structures are 

 almost exact reproductions, in miniature, of brevipila. At pres- 

 ent, it seems better to regard the new form as a sub-species of 

 brevipila, though a well marked one. The fact that it has been 

 found in two localities, twenty miles apart, shows that it is not 

 merely a dwarfed local variety. It should be remembered that 

 nearly all the species of Stenotremes are markedly constant in 

 size, even when they have a wide geographic range. 

 Diam. 7 mm. alt. 5 mm. whorls 5. 



Type locality : near Pleasant Gap, Cherokee Co, Ala., "in a 

 shady but dry ravine on the mountain side, about 1200 ft. 

 generally under stones." Collected by Herbert H. Smith, Aug. 



