890 PROCEEDINGS OF THE NATIONAL MUSEUM. 



CYTHEREA (VENTRICOLA) FORDI Yates, 1890. 



Santa Barbara Islands, California, and south to the (xulf of Cali- 

 fornia and to Panama Bay, in 13 to 58 fathoms. 



This fine species is near to but quite distinct from Venus toreuma 

 Gould '^' a Polynesian species, with which Carpenter doubtfully united 

 it, and by w^hose name it has passed for some years. It reaches a 

 a length of 65 mm., and is easil}^ recognized b}" its Ii<ocardia-Y\\;A form, 

 concentric undulations and sharp radial stria?. 



CYTHEREA (VENTRICOLA) MAGDALENE Dall, 1902. 



Oft' Magdalona Bay, west coast of Lower C'alifornia. in 36, and in 

 Panama Bay in 18 fathoms. 



The analogue of C. strlgillina Dall, of the Atlantic fauna, but 

 thinner, less inflated, with more delicate sculpture, and pale yellowish 

 coloration spattered with brown flecks. 



CYTHEREA (VENTRICOLA) RIGIDA Dillwyn, 1817. 



Gulf of California in \)^ fathoms, sand, oft' the peninsular coast near 

 La Paz. Also in the Atlantic fauna. 



The discovery of this well-known Atlantic shell by the United States 

 Fish Commission steamer Alhatrosv in the Gulf of California was a 

 surprise; but the specimen, 85 mm. in length, does not seem to dift'er 

 constantly in any respect from the West Indian shells. The synonymy 

 is summarized in the Atlantic list. It is not Venus rlglda Gould, 1850. 

 The Pacific shell was named Venits isocardia by Verrill in 1870. 



CYTHEREA (FOVEOLATA VAR.?) LEPIDOGLYPTA Dall, 1902. 



Purchased at Acapulco by W. H. Dall in 18«)8. 



This species has an extraordinary" resemblanc(» externally to Venus 

 campechlensis of the same size, but it has the hinge of Cytherea. It 

 also resembles the figure of Venus foveolata Sowerby, 1853, a species 

 referred to both Martinique and China by Deshayes. The raised lam- 

 ella are minutely, trans versel}^, closely striated, but there is no radial 

 interstitial sculpture. The shell is of a yellowish white color. It was 

 purchased with a lot of beach shells, all West American, at Acapulco. 



CYTHEREA (CYTHEREA) MULTICOSTATA Sowerby, 1835. 



Gulf of California and south to Panama Bay, in moderate depths of 

 water; also at the Galapagos Islands. 



Belonging to the group of C. listerl, but more oval and with some- 

 what different sculpture. Venus thouars! Valenciennes, 1816, is prob- 

 ably synonymous. The anterior lateral is usually obsolete in adult 

 specimens, but distinct in the young. 



« Venus toreuma Gould, July, 1850, from Mangsi Island ; -f T'. crehrisulca Sowerby, 

 1853, and V. jukesii Deshayes, 1853, Luzon, and Port Essington, North Australia. 



