GASTEROPODA. 113 



by ]Mr. Gray, and 'Sir. S. Wood ; it appears to us very nearly allied to cinulia 

 {=aveUa7ia, D'Orb.) in tornateUidce. 



Purpura (Adans), Lam. Purple. 



Type, P. persica, PI. VI., fig. 1. 



Shell striated, imbricated or tuberculated ; spire short ; aperture large, 

 sligbtly notched in front ; inner lip mucli worn and flattened. Operc. 

 lamellar, nucleus external. PL VI., fig. 2. Lingual dentition like murex 

 ei-inaceus ; teeth transverse, 3 crested ; uncial small, simple. 



Many of the pii7~jmrce produce a fluid which gives a dull crimson dye ; it 

 may be obtained by pressing on the operculum. P. lajjillus abounds on the 

 British coast at low- water, amongst sea-weed ; it is veiy destructive to 

 mussel-beds (Fleming). 



Distr., 140 sp. "VV. Indies, Brit., Africa, India, New Zealand, Pacific, 

 Chile, California, Kamschatka. Prom low-water — 25 fathoms. 



Fossil, 30 sp, Miocene — . Brit., Prance, &c. 



Sub-genus. ConcJiolepas, Pavan. C. lepas (Gmelin sp.) PI. VI., fig. 3. 

 Peru. The only sp. differs from purpm^a in the size of its aperture, and 

 smallness of the spire. 



PPuRPURiNA (Lycett, 1S47). D'Orb. 



Shell, ventricose, coronated ; spire, short ; aperture, lai'ge, scarcely notched 

 in front. 



Fossil, 9 sp., Bath-oolite. Brit. Prance. The tyjie, F. rvgosa, some- 

 what resembles j5?«7J2«-(55 chocolatum (Duclos),but the genus probably belongs 

 to an extinct group. 



MoNOCEROs, Lam. 



Elym., monos, one; ceras, horn. 



Syn., acanthina, Fischer. Chorus, Gray. 



Type, M. imbricatum. PI. VI., fig. 4 (Buc. monoceros, Chemn). 



Shell, like pm-pura ; with a spiral groove on the whirls, ending in a pro- 

 minent spine on the outer lip. This genus is retained on account of its geo- 

 graphical curiosity ; it consists of sp. of purpura, lagena, turbinella, pseudo- 

 liva, &c. 



JDistr., 18 sp. W, coast of America. 



Fossil, tertiary. Chile. 



31. gigantens (chorus) has the canal produced like fi'sus. M. cingidaiimi 

 is a turhinella, and several sp. belong more properly to lagena. 



Pedicularia, Swainsou. 



Type, P. sicula. Pl. VI., fig. 5 {thyreus, Phil.). 



Shell very small, limpet -like ; with a large aperture, channelled in front, 

 and a minute, lateral spire. Lingual dentition peculiar ; teeth single, hooked, 

 denticulated ; nnciui, 3 ; 1, four-cusped, 3, 3, elongated, three-spined. 



