372 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



anonymous Pectuncuhts aculeatus of the Museum Calonnianum, in 

 1797. 

 A variety in which the spines are aborted is not uncommon. 



PITARIA (LAMELLICONCHA) CIRCINATA Born, 1778. 



The Antilles, the northern shores of South America, and southward 

 to Santa Caterina, Brazil. 



This shell can hardl}' be separated from the P. alternata Broderip, 

 of the Pacific shores of South and Central America, and has been 

 stated to occur on the Avest coast of Africa as the YenuH gvmeensis 

 Gmelin, 1792. Other synonyms are Cardium purpurea Martyn, 1784, 

 and Venus ruhra Gmelin, 1792. 



CYTHEREA (CYTHEREA) LISTERI Gray, 1838. 



From Lake Worth, Florida, and the keys, southward through the 

 Antilles, as far as Tortola and the Virgin Islands. 



This has been erroneously identified with V. reticulata Linnaeus and 

 Y. crisjmta Deshayes, 1853, and wrongly referred to the Indo-Pacific 

 fauna by Deshaj^es. There is a dash of purple under the nymphs. 



CYTHEREA (VENTRICOLA) RIGIDA Dillwyn, 1817. 



Florida Keys to Rio Janeiro, including the West Indies; also in the 

 Gulf of California. 



This well-known shell is th^Yenus rugosa Gmelin, 1792, not of Lin- 

 naeus, 1771; it is the Pectunculus rlgidus Solander MS., 1798; Y. cincta 

 Gmelin, 1792, is probably the 3'oung, and Schroter wrongly identified 

 our shell with Yentts casina. 



CYTHEREA (VENTRICOLA) RUGATINA Heilprin, 1886. 



Cape Hatteras, North Carolina, the Gulf of Mexico and southeast- 

 ward to Porto Rico in 26 to 85 fathoms; also fossil in the Florida 

 Pliocene. 



Shell resembling C. rigida^ but with the primary concentric lamellae 

 more distant and the secondary lamelhe more distinct. The margin 

 below the lunule is produced into a point. 



CYTHEREA (VENTRICOLA) STRIGILLINA Ball, 1902. 



From Key West, Florida, to Barbados, and 90 miles southeast of 

 Cape San Roque, Brazil, in 20 to 100 fathoms. 



Shell entirely white, much smaller than the preceding species, and 

 with very much finer, though similar, sculpture. The lunule is also 

 proportionately larger. 



CYTHEREA (VENTRICOLA) CALLIMORPHA Ball, 1902. 



Barbados in 7(5 fathoms; a young shell, perhaps identical, off Cape 

 San Antonio, Cuba, in 300 fathoms. 



