OS CALIFOUNIA A<AI)KMY UK SC'li;Nt:E«. 



Distinguishable from A. ln/ilni'i i)y siiialUT .si/c, Iniiicalcil postoiior end with 

 process on interior at this end, comparatively coarser sculpture, straij^hter posterior 

 dorsal marj^iii, and fewer teelii. 'Die type shows two concentric furrows, one at -.-') 

 mm. and tlie other at 1 mm. from the umlxt, which are prohahly the result of inter- 

 rupted growth. Specimens identilied i)y Dr. Dall, who |>ronounced them a variety of 

 L. miniila Fabr., a norlhern species. 



Rare in lower San Pedm scries of Deadnian Lsland and Smi i'cdro. Tlie 

 specimen figured is the type, which is from the lower .San Pedro series al 1 )i;i(hii;in 

 Island, and is now in the rniled States National Museum. 



J^kistocene. — San Pedro (Arnold). 



i6. Leda taphria Dull. 



rL.\TE XVII, Fui. r,. 



Leda taphria Dall, Nat. Hi.st. Soc. Briiisli Columbia, Bui!. No. 2, 1897, p. 7, PI. II, figs. 6 and 8 

 (=f«-/<i/(i Hus., 1S44, not CoNR., i9:T,2; Jidc Dall, Trans. Wagner Inst. Sci., Vol. Ill, 1898, 



P- 579)- 



Niiaila cwlata Hds., Proc. Zool. Soc, 1844, p. 99: Zool. Sulph., p. 64, Pi. XVIII, fig. 13, 1844. 



Leda cielata Hds., Thes. Conch., Vol. Ill, No. 42, figs. 95, 96. Carpf.nter, Brit. Assn. Rept., 1863, 

 p. 644. Gabb, Pal. Cal., Vol. II, 1869, p. 103. Cooper, 7th Ann. Rtpt. Cal. St. Min., 1888, 

 p. 245. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 192. 



Shell small, trigonal, oblong and rounded in fi-ont, produced and pointed behind; surface 

 sculptured by numerous sharp, concentric, raised lines; umbones central, turned toward posterior 

 end; escutcheon long, narrow and concentrically striated; hinge with prominent internal cartilage-pit, 

 and about twenty sharp teeth on each side; pallial line with a small sinus; umbonal area with a linear 

 impression joining the anterior adductor. 



Dimensions. — Long. 19 mm.; alt. 11 mm.; diam. 8 mm. 



This is the largest of this genus found in these deposits, and is easily recog- 

 nized by its size, sculpture and peculiar teeth. Hinds' name, L. cndnta, was preoccu- 

 pied by a species of Conrad's, and Dall has renamed Hinds' species for that reason. 

 Specimens identifleil by Dr. Dall. 



Found in Pliocene of Deadman Island and Tiiura's Point; lower San 

 Pedro series of Deadman Island and San Pedro; and in the upper San Pedro series 

 of Deadman I.sland, San Pedro, Crawfish George's, Los Cerritos, and Long Beach. 

 Found also in the Pliocene of Pacific Beacli, and in the Pleistocene of Spanish Bight 

 and Pacific Beach, San Diego. The specimen figured is from the lower San Pedro 

 .series at Deadman Island, and is now in the collection of Delos Arnold. 



Liriiig. — Bodega Bay to San Diego (Cooper). 



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

 (Arnold). 



Pliocene. — San Fernando; San Diego well (Cooper): San Pedro; San Diego 

 (Arnold). 



