26 PROCEEDINGS OF THE ACADEMY OF [Jan., 



This is one of the species which was confused with the following 

 shell by Dr. Carpenter. 

 Semele sparsilineata n. sp. 



Panama, 18 fathoms. (Coll. U. S. N. Mus., No. 96,269.) 



Chile, Hupe. 



This was confused by Hupe with S. variegata Lam., 1818, which 

 it much resembles, but is easily discriminated from the Atlantic 

 species by the much sparser oblique grooving. The best specimen 

 in the National Collection is 15 by 10 mm., with the vertical from 

 the beaks 6.5 mm. behind the anterior end; but the shell grows much 

 larger. 



Semele bicolor C. B. Adams, 1852. 



Gulf of California to Panama. (Coll. U. S. N. Mus.) 



A thin orbicular species with distinctive purple suffusion on a 

 white ground. 

 Semele rupicola n. sp. 



This is Semele rupium of California authors following Carpenter; 

 not of Sowerby, 1832. 



Santa Cruz, California, to the Gulf of California. (Coll. U. S. N. 

 Mus.) 



The Galapagos species, for which this has been mistaken, when 

 not distorted by its nestling habit, has a conspicuous furrow radiating 

 from the beak and rostrating the posterior end, and the form of the 

 pallial sinus is different from that of the North American form. 

 The former character is absent in the latter shell, but they are 

 otherwise much alike. 

 Semele rubropicta Dall, 1871. 



Forrester Island, Alaska (Willetts); British Columbia to Tia 

 Juana, Lower California. (Coll. U. S. N. Mus.) 



Semele elliptica Sowerby, 1832. 



Not of Carpenter, 1864. 



Central America to Ecuador. (CoU. U. S. N. Mus.) 



Semele junonia Verrill, 1870. 



Carmen Island, Gulf of California. (Coll. U. S. N. Mus.) 



Semele jovis A. Adams, 1853. 



Carmen Island, Gulf of California. (Coll. U. S. N. Mus.) 



The preceding species and this one appear to be perfectly distinct. 



Semele formosa Sowerby, 1832. 



Gulf of California to Ecuador. (Coll. U. S. N. Mus.) 



