322 MURICID^. 



two species ; his figured type is T. clathratus, and what 

 he considered the young is T. truncatus. The Fusus 

 scalariformis of Nyst, from the Belgian tertiaries, is 

 different from that of Gould. 



Another arctic species, found by Sir Henry James in 

 the Wexford postglacial deposit, is T. craticulatus of 

 Fabricius (not of Linne) ; it is the Fusus Fabricii (Beck) 

 of Moller, and Mures? borealis of Reeve. This inhabits 

 Greenland and the White Sea. 



A specimen of T. Syracusanus was picked up by Dr. 

 Lloyd of Malahide on the sands at Portmarnock in 

 Dublin Bay; it is a rather common Mediterranean 

 shell. Owing to some mistake this specimen is noticed 

 in the ' History of British Mollusca ' (vol. iii. p. 440, 

 footnote) as the Murex rostratus of Olivi, and as having 

 been found by Mrs. R. Smith at Tenby : possibly the 

 Fusus decussatus of Brown (said to have been discovered 

 by him at Killough, co. Down) may be the plain-coloured 

 variety of the first-named species. 



Genus VI. FUSUS*, Bruguiere. PL VI. f. 3. 



SHELL spindle-shaped, never umbilicate, spirally striated, and 

 sometimes also ribbed, although not varicosely : epidermis mem- 

 branous. occasionally pilose or hispid : spire long and tapering ; 

 apex usually mammiform, but in certain species symmetrical : 

 mouth nearly always plain-edged and having a smooth throat 

 and pillar : canal and operculum as in Trophon. 



Although it is very difficult to distinguish this genus 

 from Trophonj its operculum is constructed on a dif- 

 ferent plan from that of the Buccinum family. Their 

 habitat also must be taken into account. Purpura and 

 for the most part Buccinum are littoral ; this never lives 



* A spindle. 



