MITRID-aE. ITl 



DiBAPHUS, Philippi. 



Distr. — D. Philippii, Crosse (lv,47). Polynesia, Mauritius. 



Subcylindrical, covered with a thin epidermis, transversely 

 sculptured ; spire acute ; aperture narrow, linear ; columella 

 without plaits, narrowed and turned to the left at base ; outer 

 lip thickened, rectilinear, abruptly truncated and recurved at 

 the base. 



Differs from Mitroidea in the columella being without plaits. 

 It resembles in general form Conus mitratus^ as well as more 

 distantly Strovibus terebellatus, and formerly had a position 

 between Conus and Mitra, but the animal does not differ from 

 Mitra. Like that genus, when plunged living into alcohol it 

 yields a fine purple dye. 



TuRRicuLA, Klein. 



Syn. — Callithea, Swains. Yexillum, Bolt. Tiara, Swains. 

 Vulpecula, Blainv. 



Distr. — 162 sp. Exclusively tropical and subtropical, its 

 metropolis being Central Polynesia. T. plicaria, Linn. (Iv, 48). 



Shell elongated, turreted, longitudinally plicately ribbed ; 

 spire acuminated ; aperture narrow ; columella with numerous 

 plaits ; outer lip internally striated. 



COSTELLARIA, Swainson. Shell smaller, with elevated spire, 

 body-whorl anteriorly contracted, slightly ventricose in the 

 middle, aperture sometimes striated within. T. exasperata, 

 Cheran. (Iv, 49). 



pusio. Swains. Shell small, ovate, more or less ribbed or 

 nodulous, spire usually short, convex, with obtuse apex ; outer 

 lip sometimes thickened. T. luculenta, Reeve (Iv, 50). 



LAPPARTA, Conrad. Uncharacterized. T. dumosa, Conrad 

 (Iv, 51). Eocene; Jackson, Miss. 



Cyltndra, Schum., 1811. 



Distr. — 8 sp. Red Sea, Lidian Ocean, China, Philippines, 

 Polynesia, Mauritius. G. fenestrata, Lam. (Iv, 52). 



Shell oliviform, subcylindrical; spire conical; aperture linear; 

 columella straight, with several oblique anterior plaits ; outer lip 

 thickened, smooth within. 



Imbricaria, Schum., 1817. 



Sy7i. — Conoelix, Swains. 



Distr. — 9 sp. Philippines, Polynesia. /. marmorata, Quoy 

 (Iv. 53 \ 



Shell coniform, often covered with an epidermis ; spire de- 

 pressed conical, apex mucronate ; aperture linear ; columella 

 straight, with numerous transverse imbricated plaits in the 

 middle ; outer lip thickened. 



