232 
under the name of Sol, and by Bolten as Astrea. 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. 
Umsonivum, Link, 1807, J. c. iii. p. 136. 
Spire much depressed ; aperture directed downwards, 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 Link’s name is to be adopted instead of Globulus, Schum., 
or Rotella, Lamck., can hardly be controverted ; although his second 
species belongs to another tribe. 
Pyruta, Bolten, 1798, Mus. (ed. 1819, p. 74); Link, 1807, /. ¢. iii. 
p. 139. 
Whorls, each of them composed of two pieces ; aperture longitu- 
dinal, toothed on both sides. 
Pythia scarabea, Linn. sp. 
This name is preferable to that of Fischer, Polydonta, which, 
although contemporary, is badly made, and wants correction. 
ACEPHALA. 
Sunetra, Link, 1807, J. c. ii. p. 148. 
Equivalve, in front rather obtuse, closed; hinge with two cardinal 
teeth, lateral ones indistinct ; anterior slope shorter than the furrow- 
shaped posterior slope; ligament external. 
Sunetta scripta (Chemn. f. 261-265) = Cuneus, Muhlf. 1811 = 
Meroé, Schum. 1817. 
Trve.a, Link, 1807, 7. c. ii. p. 152. * 
Equivalve, longitudinal, without epiderm, closed; hinge with two 
cardinal and one elongated lateral tooth ; anterior and posterior slopes 
equally elongated ; ligament external. 
Tivela vulgaris (Chemn. f. 362).—T. tripla (Venus), Linn.= Tri- 
gona, Muhlf. 1811. 
Muscutrvum, Link, 1807, l. c. iii. p. 152. 
Equivalve, closed; hinge with two small cardinal teeth, no lateral 
ones ; anterior and posterior slope nearly equal. 
Musculium lacustre (Tellina), Linn. 
The genus established here, fourteen years afterwards was pub- 
lished as Pisidium. 
TrENTACULATA. See ‘Ind. Gen. Malacoz.’ ii. 541. 
Verpa, Bolten, 1798, Mus. (ed. 1819, p. 49) ; Link, 1807, JZ. e. iii. 
p. 159. 
Shell tubular, partly straight, partly winding, at one extremity 
open, at the other closed by a convex perforated blade. 
Verpa penis (Serpula), Linn. 
