Genus Latirus. 371 



Mollusca) to tabulate the genera, with a more minute 

 description of the dentition than had been previously given. 

 I think it well to quote their differentiation : — 



FAM. FASCIOLARIINiE. 



Teeth on lingual membrane in three series (i.i.i.), the 

 central recurved, toothed at the tip, the lateral not versatile ; 

 lateral teeth very broad, linear, with many equal teeth, 

 central tooth narrow, small. Mantle enclosed, with a straight 

 siphon. The operculum ovate acute, nucleus apical. 8hell 

 fusiform, aperture with a straight canal in front, and with 

 plaits on the fore part of the pillar. 



Genus Fasciolaria (Lamarck). 



Shell fusiform, spire acuminated ; aperture oval, elon- 

 gated, as long as the spire ; siphonal canal straight, columella 

 smooth, with a few oblique plaits at the fore part, outer lip 

 internally crenate. 



*23 sp., nearly all of large size. F. gigantea (Kien.) 

 being the largest Gasteropod known, reaching sometimes 

 over two feet in length. 



[Genus BuSYCON(Bolten). i^/^^?^r (Montfort). 



8 species. Removed to Turbinellidce^ as now revised]. 



c.f. Fischer Man. Con, p. 20. 



Genus Tudicla (Bolten). 



3 species. Removed to TurbinellidcB\ 



c.f. Fischer ut supra. 



Genus Latirus (Montfort). 



Shell turreted, fusiform, umbilicated ; spire produced, 

 whorls nodulous ; aperture oval-oblong, outer lip thin, 

 crenulated ; columella straight, with two or three small 

 oblique plaits in front. 



* Many were synonyms. Fasciolaria at the present day is computed to 

 contain 17 to 18 sp. only. 



