124 CONCHOLOGY. 



Northern and Mediterranean seas. Fourteen living species. Five 



Ranella gigantea. 

 R. candisata. 

 R. ranina. 

 R. bufonia. 

 R. granifera. 

 R. bitubercularis. 

 R. anceps. 



Ranella leucostoma. 

 R. Argus. 

 R. spinosa. 

 R. granulata. 

 R. semigranosa. 

 R. crumena. 

 R. pygmsea. 



10. Genus Miirex. PI. XI. 



Animal. See Pleurotoma, above. 



Shell, Usually oval ; the spire but slightly elevated, roughened 

 with longitudinal, transversal bands or varices ; aperture small, 

 quite oval, and symmetrical by ihe excavation of the left edge, 

 formed by a lamina applied upon the columella, terminated an- 

 teriorly by a middling canal sometimes very long and closed ; the 

 right edge more or less furnished v^^ith varices. Operculum horny, 

 complete, oval, nearly circular, vi'ith sub-concentric partitions ; 

 summit terminal. This genus comprehends only such shells as 

 have only three or more varices on each whorl. These varices 

 show how often the animal has increased the size of its shell. 

 Found in all seas. Seventy-three living species. Two fossil. 



Murex cornutus. 

 M. tenuispina. 

 M. ternispina. 

 M. motacilla. 

 M. palmarosse. 

 M. adustus. 

 M. crevicornis. 

 M. microphyllus. 

 M. phylopterus. 

 M. trigonularis. 

 M. brandaris. 

 M. rarispina. 

 M. haustellum. 

 M. infiatus. 



Murex costularis. 

 M. angularis. 

 M. cingulatus. 

 M. torosus. 

 M. granarius. 

 M. aciculatus. 

 M. ferrugo. 

 M. pinnatus. 

 M. triqueter. 

 M. saxatilis. 

 M. melanomathos. 

 M. secundus. 

 M. trunculus. 

 M. Maffellanicus. 



