396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



CHIONE (TIMOCLEAl PERTINCTA Dall, 1902. 



Galapagos Islands. 



This is a remarkable shell, white, with brown Hames on the poste- 

 rior dorsal slope, and a brown lunule; the sculpture almost exclusively 

 of distant narrow sulci, which tend to fail at an anterior space in front 

 of the vertical of the beaks. The inner margin is crenulate and white 

 and except the cavity under the beaks, the interior is usually of a verv 

 dark rich purple. Worn specimens were referred toPajjhia gnda Say, 

 by Stearns in his list of Galapagos shells, in 1898. 



ANOMALOCARDIA SUBRUGOSA Sowerby, 1834. 



Margarita Island, Lower California, the Gulf of California, and 

 southward to Valparaiso. 



This well-known and (diaracteristic form was named Cytherea suh- 

 sidcata by Menke according to Philippi, 1844; and Vemis {Triquetra) 

 triradiata Anton, 1839. 



ANOMALOCARDIA SUBIMBRICATA Sowerby, 1835. 



Cape St. Lucas, the Gulf of California, and south to Panama Bay. 

 Ve7ius UUneata Reeve, 1863, may perhaps be synonymous. Chione 

 tyj/wns Verrill, 187(», is one of the numerous mutations. 



VENUS KENNICOTTII Dall, 1871. 



Ncah Bay, Washington, to Little River, Mendocino ( 'ounty, Cali- 

 fornia. ^ ' 



Shell of a yellowish-white color and apparently very rare. It is 

 finely closely lamellose over the whole surface and the rugose area of 

 the hinge is nmch smaller than in V. mercenaria. The corrugated space 

 IS more narrow and delicate than in the Atlantic species, but this area 

 IS still further diminished in the Japanese V. sf I mj>s<m I GonV\ the 

 only exotic species of the group, first named V. orlentaJh in MS. 

 according to Carpenter, 185(). 



VENUS APODEMA Dall, 1902. 



Humboldt Bay, Gulf of Panama, Arthur Schott. - 

 A rounded species with low, wide concentric riblets, radially striated 

 on the umbones and with very feeble crenulation of the inner margins. 



MARCIA KENNERLEYI (Carpenter MS. , Reeve, 1863. 



Kadiak Island and Port Etches, Prince William ^V)und, Alaska: and 

 southward to Monterey, California, in 8 to 18 fathoms. 



Ihe shell IS grayish white, with low, coarse, somewhat irregular 

 concentric ribbing. It has been confused bv Gabb with V.n.^ per- 

 Imn^sa Conrad 1855, a miocene fossil, and another form afterwards 

 called perteniu-s by Gabb, 1869. 



