AUNOLU — THE I'ALliONTOLUCiV ANU STKATKIKAI'M Y UF SAN I'EDKU. 241 



;iii(l iit batli-lioiise, Santa Barbara. The specimen fif^ured is from the upper San 

 i\(iro series at San Pedro, and is now in the collection of Delos Arnold. 



Lioiitg. — Neah Bay to San Diego (Cooper). 



/Vci.s^ocene.— Santa liariiara to San Pedro (Cooper): San Peilro; San Diego; 

 Santa iJarbara (ArnoUl). 



Pliocene. — San Diego well (Dall). 



(uMius Amphissa Jl. .( .1. Ailams. 



.Shell bucciniforni, longitiulinally libbeil; s[)ire elevated; aperture rather wide, enlarginjj 

 below, aiui teriiiinating in a wide anterior sinus; inner lip callous, plicate below; outer lip not thickened 

 on margin, plicate within. 



A7n2)hissa corrugata Reeve is a characteristic species. 



235. Amphissa corrugata Reeve. 



Biucinuyn corrugatum RvE., Icon. Conch., PI. IV, fig. no, 1S46. 



Tru7icaria corrugata RvE., CpR., Brit. Assn. Rept., 1863, p. 662. 



Cominella {Atnphissa) corrugata RvE., Cpr., Brit. Assn. Rept., 1866. Gabu, Pal. Cal., Vol. II, 



p. 74. 1869. 

 Amphissa corrugata RvK., Tryon, Man. Conch., Vol. V, ]). 197, PI. LXIII, fig. 66, 1883. 



Cooper, 7th Ann. Rept. Cal. St. Min., 1SS8, p. 228. Keep, West Co;ist Shells, 



p. 34, fig. 14, 1892. 



Shell small, solid, fusiform; spire elevated; ape.x acute; whorls seven, slight))' conve.x, with 

 about eighteen to twenty rather wavy, slightly oblique, rounded, transverse ridges e-xtending from 

 suture to suture; spiral ornamentation consists of numerous fine, raised lines in the interspaces 

 between the transverse ridges; suture impressed, distinct; aperture rhomboidal, narrow; outer lip 

 Urate within; inner lip incrusted, smooth; canal short, recurved; pillar spirally lined externally. 



Dimoisions. — Long. 19 mm.; lat. 9 mm.; body-whorl 13.5 mm.; aperture 10 mm.; defl. 

 52 degrees. 



The Pliocene form.s are much smaller than the one described above (a Pleisto- 

 cene specimen). Carpenter mentions the shells as becoming dwarfed in deep water 

 (10 fathoms). 



Rather common in Pliocene and lower San Pedro series at Deadman Island; 

 I'are in upper San Pedro series at San Pedro, Los Cerritos, and Crawfish (leorge's. 

 Found also in the Pleistocene at the bath-house, Santa Barbara. 



Living. — Alaska to San Diego (Cooper). 



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

 bara (AriioUl). 



Pliocene. — San Diego well (Dall): San Pedro (Arnold). 



( 31) Marcli 21, 1903. 



