PYRAMIDELtlDiE. 295 



be regarded rather as appertaining to past ages than the present 

 epoch." — FoBBES. 



P^-ramidena and Obeliscus have been monographed by : 



Kiener, Coquilles vivantes, 6 species. 



Arthur Adams in Sowerby's Tiiesaurus Conch^iiorum, ii, 53 

 species. 



Reeve, Conch. Icon., xv, 45 species, 18C2. 



\ Synopsis of Genera. 



Genus PTRAMIDELLA, Lam., It99. 



Shell turriculated, of many whorls, longitudinally ribbed or 

 smooth ; aperture semioval, entire, rounded in front, the columella 

 straight, with anterior strong plications, outer lip sharp, often 

 plicate within. 



Inhabits tropical seas. Fossil, cretaceous and tertiary. 



Subgenus Pyramidella (sensu stricto). 



Shell smooth — typically with perforated axis. P. dolabrata, 

 Linnseus. 



Obeliscus (Humphrey, 1797), Moreh, 1852, is a synonym. 



Section Lonch^us, Morch, 1874. 



Shell imperforate, last whorl with a median sulcus. P. 

 punctata, Chemn. 



Section Triptychus, Morch, 1874. 



Shell subulate, spirally paucilirate, aperture lirate within, sub- 

 sinuated in front, columella triplicate. P. nivea, Morch. 



Section Amoura, de Folin, 1873. 



Shell subcylindrical, elongated, with feeble longitudinal ribs 

 and two spiral cords; last whorl concentrically striated at the 

 base ; columella biplicate. P. angulifera, Folin. 



Section Tiberia, Jeffreys, 1875. 



Shell very small, umbilicatcd, columella biplicate. P. nitidula, 

 A. Ad. 



Subgenus Otopleura, Fischer, 1885. 



Shell oval, turriculated, pupiform, with longitudinal ribs; 

 aperture oval, subchanneled at the base of the colnmella; coin- 



