Zoological Society. 4(S't' 



Tuilicia spirilliiit, Linn. sp. 



Subsequently established asHaustellum o,Sclmm., PyreWa, Swains., 

 Spirillus, Schlut., Spiri/Ut, Sow. jun. 



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



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

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

 that arc commonly discontinuous ; base rather elon}>,ated. 



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

 voL ii. p. 009. 



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



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

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



Distortrix amis, Linn, sp., and rcfiviilata (Chemn. f. 405, 106). 



This name then is to be substituted in the phice of Persona, Moutf. 



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



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

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

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

 elongated. 



Gi/riHeumechinatum {Chcmn.f. 1274, 127:0, rana{{'. 12G!), 1270), 

 bu/oninm {{.1240, 1211), natator{{.l220, \2'M),iwrrHcosiuii{l\2:V3, 

 1231), caudatim(f. 101.5-1047), scrobiculator, = llanella, Lamck. 



Canrena, Link, 1807, I. c. iii. p. 12(5. 



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. \7\S-\72Q).—AstraUumcal- 

 car, Gm., sp. 



This genus will 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 Astr<ea. 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- 

 lium, Phil. 



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



Spire much depressed ; aperture directed downwards, or to the 

 side, simple ; base showing a convex callus in the i)lace of the um- 

 bilicus. 



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



That Link's name is to be adopted instead of Globulus, Schum., 



31* 



