231 



Vasum, Link, 180", I. c. iii. p. 119. (Fasuni, Bolt, emend.) 



Spire rather long ; aperture longitudinal ; inner lip callous, with 

 alternately larger folds ; outer lip simple ; shell without distinct va- 

 rices ; base elongated. 



Vasum Ceramicmn, Linn, sp., &c. 



This is Cynodonta, Schum., Scolymus, Sw. 



TuDiCLA, Link, 1807, I- c. iii. p. 120. (Tudicla, Bolt, emend.) 



Spire very short, depressed ; aperture above semicircular ; inner 

 lip callous, with a single fold ; outer one simple ; no varices or spines ; 

 canal straight, thin. 



Tudicla spirillus, Linn. sp. 



Subsequently established asHaustellum a, Schum., Pyrella, Swains., 

 Spirillus, Schlut., Spirilla, Sow. jun. 



Tritonium, Link, 1807, I. c. iii. p. 121. 



Spire rather long ; aperture above rounded ; inner lip callous, ge- 

 nerally with small folds ; outer lip marginated ; shell with varices 

 that are commonly discontinuous ; base rather elongated. 



With respect to this genus I may refer to my ' Ind. Gen. Malacoz.' 

 vol. ii. p. 609. 



DiSTORTRix, Link, 1807, I. c. iii. p. 122. 



Spire rather long ; whorls distorted ; inner lip callous, folded ; 

 outer lip marginated ; varices indistinct ; base short-tailed. 



Distortrix anus, Linn, sp., and reticulata (Chemn. f. 405, 406). 

 This name then is to be substituted in the place o{ Persona, Montf. 



Gyrineum, Link, 1807, I- c. iii. p. 123. 



Spire nearly equal to the last whorl ; aperture rounded ; inner 

 lip callous, often slightly folded or granulated ; outer lip marginated ; 

 shell compressed, with two opposite varices ; base short or a Uttle 

 elongated. 



Gyrineum echinatum (Chemn. f. 1274, 1275), rana (f. 1269, 1270), 

 bufonimn (J. 1240, 1241), ?iatator(f. 1229, I230),verrucosum({.l233, 

 1234), caudatum (f. 1045-1047), scrobiculator, = Ranella, Lamck. 



Canrena, Link, 1807, I. c iii. p. 126. 



Spire short ; aperture longitudinal ; inner lip folded ; outer lip in- 

 teriorly strongly dentated ; shell crowded with spines, but without 

 distinct varices ; base short. 



Canrena neritoidea (Mart. f. 972, 973, 976-979) = Ricinula, 

 Lamck. &c. 



Adelobranchea. 



AsTRALiuM, Link, 1807, I. c. iii. p. 135. 



Spire depressed ; aperture broad, rounded, bending downwards. 



Astralium deplanatum (Chemn. f. 1718-1720). — Astralium cal- 

 car, Gm., sp. 



This genus will no doubt be acknowledged, being congruous with 

 Calcar, Montf., Phil. It had been indicated before by G. Humphrey, 



