13ti lAI.II-OltNIA AC.VDKMY OK SCIKNCKS. 



This Species is (lisliiimiishiihli! from T. fiisn-ld l)y its iniicli smallci' si/.o, more 

 central iiml)oiios ami less |iromiiieiit liiniile. Di Dull says tli.il T. (jouldi lias been 

 mistaken for ('ri/ptoduii jlv.niosus by West ( 'oasl cnlicctors. 



llatlu-r cummon in tlie IMeistoeene (»f Dead Man Island and Timm's roint. 

 Not foiuul above tlie horizon in tiie San IVdro deposits, so far as known. 



Licbuj.- Catalina Island (Coopci): ("alalina Island, h ii fMllionis (Anuiiil). 



Plehtoceiie. — Santa Barbara (Cooper). 



Pliocene. — Santa Barbara; San I)iej:;o well (Cooper): San Pedro (Arnold), 



Siiperlaniily LKI'TON ACi:.\. 



Family XXIV. LEI'TONID.E. 



Genus Bornia J'liiUj>/ii. 



Shell ovate or subtrigonal, subequilateral, with a more or less flattened disk; the peri- 

 ostracum usually hrilliant; the surface smooth or divaricately more or less |)licate; pallia! line not 

 sinuated, and the pallia! area piquanlly punctate or radially striate; hinge with one moderately long 

 posterior, and two shorter anterior, lamina in the left valve; in the right, one anterior and one 

 longer, sometimes remote, |)osterior lamina; one or both of the anterior lamina- in either valve may 

 have the aspect of cardinals; hinge-plate usually excavated. 



Type, Bornia corhilniilix ( I'hil). 



67. Bornia retifera Ihdl. 



Plate XVII, Fii:. 12. 



Boniia relifera Dai.l, Proc. U. S. Nat. Mus., Vol. XXI, 1899, p. S89, PI. LXXXVIl, fig. 2. 



Shell thin, white, moderately convex, rounded, trigonal, nearly equilateral; beaks distinct, 

 not high; surface polished, with faint incremental lines and minute, close punctations whose inter- 

 spaces give the eflfect of a fine netting; hinge narrow, delicate; one tooth opposite beak, then a 

 depression posterior to this, and then a second tooth completely filling the anterior end of the 

 posterior ligamental groove; adductor scars rounded and high up. 



Dimensions — Long. 7 mm.; alt. 5.5 mm.; diam. 3 mm. 



Looks like a Kellia laperou^ii, but is distingnishalde by tiie microscopic 

 sculpture and hinge. Specimens identified by Dr. J)all. 



One right valve from the lower San Pedro series of Deadman Island, whicli is 

 ligiircd herewith, and is now* in the collection of Delos Arnold. 



Living. — Station 'J.iHJU, thirteen fathmns, off Santa l*>arbara (Dall). 



Pleistocene. — San Pedro (Arnold). 



Genus Kellia Turton. 



Section KeUia Turton n. s. 



Shell rounded and inflated, concentrically striated or smooth ; with an obsolete external 

 ligament and a large internal resilium without a lithodesma; two anterior and two posterior teeth in 



