Zoological Society. -151 



Tudicla sjurillus, Linn. sp. 



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

 Spirillus, Schlut., Spirilla, Sow. jun. 



Tritonium, Link, 1807, /. 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 ray ' Ind. Gen. Malacoz.' 

 vol. ii. p. 609. 



DisTORTRix, Link, 1807, L c. iii. p. 122. 



Spire rather long ; whorls distorted ; inner Up 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, 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 Up marginated ; 

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

 elongated. 



Gijrineum echinatum (Cheran. f. 1274, 1275), rana (f. 1269, 1270), 

 bufoiiium{t\2AQ, 1241), natator{f.\229, 1230), verrtico8um{i.\2^3, 

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



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



Spire short ; aperture longitudinal ; inner Up 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 wUl no doubt be acknowledged, being congruous with 

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

 under the name of Sol, and by Bolten as Astrcea. But I think it 

 should be extended farther, so as to receive Imperator and Her- 

 coles, ]Montf., Stellaria, Schmidt, Cyclocantha, Canthorbis, subg., 

 and Tubicanthus, Swains,, Bolma, Risso, Cookia, Less., and Astra- 

 liujn, Phil. 



Umbonium, Link, 1807, I. c. iii. p. 136. 



Spire much depressed ; aperture directed dovniwards, or to the 

 side, simple ; base showing a convex callus in the place of the um- 

 bilicus. 



Umbonium vestiarium, Linn, sp., and excisum (Chemn. f. 1602). 



That Luik's name is to be adopted instead of Globulus, Schura., 



31* 



