MARINE MOLLUSCA 553 



Crepidula unguiformis Lam, Tagus Cove and Point Christopher, 

 Albemarle. 



Calyptraea sordida Brod., Tagus Cove, Albemarie. 



Cnicibulum imbricatum Brod., Point Christopher, Albemarle. 



Crucibulum imbricatum trigonale A. and R., Tagus Cove, Albe- 

 marle. 



Mitrularia varia Brod., Iguana Cove and Point Christopher, Albe- 

 marle; Narboro. 



Family Rissoidae. 



Rissoina fortis Ad., Tagus Cove, Albemarle. 



Rissoina inca Orb., Iguana Cove, Albemarle. *' 



Family Littorinidae. 

 Tectarius galapagiensis Stearns, Iguana Cove, Albemarle; Cul- 

 pepper. 



Litori7ia ( Tectarius^ galapagiensis Stearns, Nautilus, vi, p. 87, Dec, 1892 ; 

 Proc. U. S. Nat. Mus., xvi, p. 396, pi. 51, f. 7, 1893. 



Litorifia {Tectarius) atyphus Stearns, Nautilus, vi, p. 88; Proc. U. S. Nat. 

 Mus., XVI, p. 350, pi. 50, f. 5, 1893, 



These two species were based upon specimens showing differences 

 of sculpture, which are shown by the series from Albemarle to be 

 completely connected by shells intermediate in sculpture. These are 

 so numerous that atyphus cannot be retained in even a varietal sense. 



Family Planaxidae. 

 Planaxis planicostatus Sowb., Culpepper. 



Family Modulidae. 

 Modulus cerodes A. Ad., Tagus Cove, Albemarle. 



Family Cerithiidae. 

 Cerithium maculosum Kien., Iguana and Tagus Coves, Albemarle; 

 Narboro. 



Cerithium uncinatum Gmel., Tagus Cove, Albemarle. 

 Cerithidea mutata Pils. and Van., Tagus Cove, Albemarle. 



Family Cyprseidae. 

 Cypraea exanthema cervinetta Kien., Tagus Cove, Albemarle; 

 Narboro. The specimens measure 6(> and 92 mm. long. 



Cypraea nigropunctata Gray, Point Christopher, Albemarle; Nar- 

 boro. 



Trivia maugeriae Gray, Tagus Cove, Albemarle. 

 Proc. Wash. Acad. Sci., Sept., 1902. 



