314 CALIFORNIA ACADEMY OF SCIENCES. 



suture impressed, distinct; aperture semilunar; outer lip sharp; inner lip callous and reflected 

 completely over the umbiHcus. 



Dimensions. — Alt. 27 mm.; lat. 25 mm.; aperture 20 mm. x 12.5 mm.; defl. 115 degrees. 



After comparing a series of Naticas collected from the Pliocene of Deadman 

 Island, part of which were identified as N. russa and part as N'. clausa by Dr. Dall, 

 it is very evident that there is no difference between the two species. This species 

 is distinguishable from Neverita reduziana by a more elevated spire, more evenly 

 convex whorls, and a more concave umbilical region. 



Rare in Pliocene of Deadman Island and Timm's Point. None have been 

 found in the Plei.stocene by the writer, except one small specimen which came from 

 the lower San Pedro series at Deadman Ishind. Found in the Pliocene at Packard's 

 Hill, and in the Pleistocene at the bath-house, Santa Barbara. The specimen 

 figured is a medium sized one from the Pliocene of Deadman Island, and is now in 

 the collection of Delos Arnold. 



Living. — Arctic Ocean; Alaska; North Atlantic (Cooper). 



Pleistocene. — Santa Barbara to San Diego (Cooper): San Pedro; Santa 

 Barbara (Arnold). 



Pliocene. — San Pedro; Santa Barbara (Arnold). 



Genus Polynices Mont fort. 



This group includes all of the Naticidte with corneous opercula. 

 Type, Natica mnmmilla Linn. 



Subgenus Neverita Risso. 



Shell depressed, orbicular; spire conical or flattened; columella partly filled by a tongue- 

 shaped callous process (funiculum) from the columella. Operculum horny. 



Natica duplicata Say is a characteristic species. 



354. Polynices (Neverita) recluziana Petit. 



Platk X, Fig. 1-2. 



Natica recluziana Petit, Deshaves, Mag. de ZooL, Mollusca, p. 37, 1841. Tryon, Man. Conch., 



Vol. VIII, p. 34, Pi. XII, fig. I, 1886. 

 Neverita recluziana Petit, H. & A. Adams, Gen. Rec. Moll., Vol. I, p. 208, 1853. Cpr., Brit. 



Assn. Rept., 1863, p. 661. Cooper, 7th Ann. Rept. Cal. St. Min., i888, p. 254. 



Keep, West Coast Shells, p. 46, fig. 26, 1892. Williamson, Proc. U. S. Nat. Mus., 



Vol. XV, 1892, p. 211. 

 Neverita recluziana Desh., Gabb, Pal. Cal., Vol. II, p. 77, 1869. Dall, Trans. Wagner Inst. Sci., 



Vol. Ill, Part 2, 1892, p. 369. 



Shell ovate to flattened globular; spire only very slightly elevated, obtuse; whorls three, 

 slightly convex; body-whorl having a long, slightly convex slope fi-om suture to near base, where it 



