98 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



Family TRIVIIDAE. 

 Genus TRIVIA Gray. 



TRIVIA ONISCUS Lamarck. 



Cat. No. 75566, U.S.N.M., two specimens from Cape of Good Hope. 

 Cat. No. 97981, U.S.N .M., ten specimens from Albany coast, South 

 Africa. Cat. No. 128415, U.S.N .M., one collected by Warren, at Cape 

 of Good Hope. Cat. No. 186797, U.S.N .M., one specimen from Port 

 Alfred (Coll. No. 162). Cat. No. 253739, U.S.'N.M., one from Algoa 

 Bay. Cat. No. 272124, U.S.N. M., three specimens from Port 

 Elizabeth. 



TRIVIA FORMOSA Gaskoin. 



Cat. No. 186799, U.S.N .M., two specimens from Port Alfred (Coll. 

 No. 164). 



TRIVIA VESICULARIS Gaskoin? 



. Cat. No. 186798, U.S.N .M., one specimen from Port Alfred (Coll. 

 No. 163). 



TRIVIA PELLUCIDULA Gaskoin. 



Cat. No. 186800, U.S.N .M., two specimens from Port Alfred (Coll. 

 No. 165). 



Family TRIPHOMDAE. 



Genus TRIPHORIS Deshayes. 



TRIPHORIS ATEA, new species. 

 Plate 11, fig. 6. 



Shell rather large, wax yellow. Nuclear whorls decollated, except 

 the last turn which is smooth. Postnuclear whorls almost flattened, 

 slightly shouldered at the summit, marked by strong, rounded, 

 slightly protractive axial ribs, which are interrupted by a deep spiral 

 sulcus at the anterior extremity of the posterior two-thirds of the 

 ribs, which lends them the appearance of so many exclamation points. 

 Of these ribs, 16 occur upon the first to third, 18 upon the fourth, 20 

 upon the fifth, 22 upon the sixth and seventh, and 26 upon the re- 

 maining whorls. The ribs are abruptly truncated at the anterior 

 termination of the sulcus and slopingly so at the posterior. In 

 addition to the above sculpture, there appears in- the suture of each 

 turn, an almost smooth, strong spiral cord, which on the last turn, 

 forms the peripheral cord, to which the axial ribs extend feebly. 

 Base very short, slightly concave, marked by three equal and equally 

 spaced spiral cords which occupy the space between the peripheral 

 cord and the insertion of the columella. The spaces which separate 

 these cords are a little less wide than the cords. Aperture decidedly 

 channeled anteriorly and less strongly so posteriorly; outer lip ren- 



