112 MANUAL OF THE MOLLUSCA. 



Type, E. spirata. PL V., fig. 11. 



Shell umbilicated when young ; inner lip callous, spreading and covering 

 the umbilicus of the adult ; opercuhim pointed, nucleus apical. 



Bistr., 9 sp. Red Sea, India, Cape, Japan, China, Australia. Solid, 

 smooth shells, which have usually lost their epidermis, and are pm-e white, 

 spotted with dai'k red ; the animal is spotted like the shell. 14 fms. (Adams.) 



Nassa, Lam. Dog-whelk. 



Eti/Di , nassa, a basket used for catching fish. 



Syn., desmouliusia and northia. Gray. 



Type, N. arcixlaria. PL V., fig. 15. 



Shell like buccinum ; columellar lip caUous, expanded, forming a tooth- 

 like projection near the anterior canal. Operc. ovate, nucleus apical. Lingual 

 teeth arched, pectinated ; uncini, with a basal tooth. 



The animal has a broad foot, with diverging horns in fi-ont, and two little 

 t^ls behind. N. obsoleta (Say) lives within the influence of fresh water and 

 becomes eroded. N. reticulata, L., is common on the English shores, at 

 low-water, and is called the dog-whelk by fishermen. 



Distr., 68 sp. Low-water— 50 fms. \Yorld-\\ide. Ai'ctic, Tropical and 

 Antarctic Sea^. 



Fossil, 19 sp. Eocene — . Brit., &c., N. America. 



Sulj-genns, cyllene. Gray. C. Oweni, PL V., fig. 17. Outer lip with a 

 slight sinus near the canal ; sutures channelled. W. Africa, Sooloo Islands, 

 Borneo. Fossil, Miocene, Tom-aine. 



Cyclonassa, Swainson. C. neritea, PL Y., fig. 16. 



Phos, Montfort. 



Etym., phos, light, Sy?i., rhinodomus, Sw. 



Type, P. senticosus, PI. V., fig. 18. 



Shell like nassa ; cancellated ; outer lip striated internally, with a slight 

 sinus near the canal ; colimieUa obliquely grooved. 



The animal has slender tentacles, "VN-ith the eyes near their tips. 



Dist/:, 30 sp. (Cuming.) Red Sea, Ceylon,. Philippines, Australia, 

 W. America. 



? RiNGicuLA, Deshayes. 



Mym., diminutive of ring ens, from ringo, to gi-in. 

 Type, R. riugens, PL V., fig. 21. 



Shell minute, ventricose, with a small spire ; apertm-e notched, columella 

 callous, deeply plaited ; outer lip thickened and reflected. 

 Distr., 4 sp. ? Medit., India, Philippines, GaUapagos. 

 Fossil, 9 sp., INliocene — . Brit., France. Ringicula is placed vkdth nassa 



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