CONCHOLOGY. 123 



which distinguishes it from the Fusus; the canal conical, 

 very long or middling, sometimes a little sloped ; aperture oval, 

 rather large ; the columella edge somewhat excavated, entire and 



trenchant ; an operculum. Found in the Northern seas . 



Twenty-nine living species. Six fossil. 



Pyrula salmo. Pyrula plicata. 



P. carica. P. canaliculata. 



P. candelabrum. P. perversa. 



P. tuba. P. bucephala. 



P. melongena. P. vespertilio. 



P. ficus. P. reticulata. 



P. spirata. P. ficoides. 



P. elongata. P. spirillus. 



P. bezoar. P. ternatana. 



P. papyracea. P. rapa. 



P. angulata. P. galeodes. 



P. nodosa. P. squamosa. 



P. abbreviata. P. citrina. 



P. deformis. P. neritoidea. 



P. lineata. 



8. Genus Striithiolaria. PI. XI. 

 Animal. See Triton, hereafter. 



Shell. Ovate; spire prolonged; aperture sinuous, terminated 

 at the base by a very short straight canal ; coluraellar edge 

 callous; right edge having a thickened varix. Inhabits the Medi- 

 terranean and Northern seas. Two species. 



Struthiolaria nodulosa. Struthiolaria crenulata. 



9. Genus Ranella. PI. XI. 



Animal. Unknown. 



Shell. Oval, and, as it were, depressed by the preservation of 

 each side of a longitudinal thickened band ; aperture oval, almost 

 symmetrical by the excavation of the columellar edge, terminating 

 anteriorly by a short canal, often a little sloping ; a sinus at the 

 posterior junction of the two edges. This genus forms a distinct 

 division between the Murex and Struthiolaria. Inhabits the 



