231 
Vasum, Link, 1807, J. c. ui. p.119. (Vasum, 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 Ceramicum, Linn. sp., &c. 
This is Cynodonta, Schum., Scolymus, Sw. 
Tupicxa, Link, 1807, /. c. ii. 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 as Haustellum a, Schum. » Pyrella, Swains., 
Spirillus, Schlut., Spirilla, Sow. jun. 
Tritonium, Link, 1807, J. ¢. iti. 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, /. c. ii. 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 of Persona, Montt. 
Gyrinevum, Link, 1807, J. 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 little 
elongated. 
Gyrineum echinatum (Chemn. f. 1274, 1275), rana (f. 1269, 1270), 
bufonium (f.1240, 1241), natator (f.1229, 1230), verrucosum (f. 1233, 
1234), caudatum (f. 1045-1047), serobiculator, = Ranella, Lamck. 
Canrena, Link, 1807, /. 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. &ce. 
ADELOBRANCHEA. 
Astra.ium, Link, 1807, /. 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, 
