TW va s 
Descriptive Catalogue of the British Testacea. - 179 
the necessity of adverting to Linnzus's. descriptions, as 
well as his references. The words * sutura subcrenata," 
point out a distinction in this species not to be found 
in any other. Yet this character has been overlooked, 
and several of the following species have been supposed 
to be T. bidens by every British author except Dr. 
Pulteney, who describes his shell as having “ the su- 
tures prettily crenated.” We have given a figure from 
a specimen in the doctors museum, now in the posses- 
sion of this Society. He notes it as a Dorsetshire shell ; 
but there is reason to believe'he was deceived, and that 
this species is not of British growth, since, notwith- 
standing a most diligent search, we have been unable to 
procure it. 
AT. | 
laminatus.'T. testa turrita, pellucida, levi; anfractibus contrariis; - 
apertura adnata, postice bidentata. 
Lister Conch. t. 41. f. 39. major. ` 
Gualt. Test. t. 4. f. C. — 
Muller Verm. 2. p. 116. n. 315. H. bidens. 
Schrot. Erdconch. t. 1. f. 4a. 
Chemn. Conch. 9. t. 112. f. 960. n. 1. 
Pulteney in Hutch. Dorset. p. 46. t. 19. 9. f 9. 
Montagu Test. Brit. p. 359. t. 11. f. 4. 
: Habitat in sylvis, et muscosis, rarior. 
^ Testa 4 poll. longa, 4 lata, glabra, Tétüiéenis-Cormes, obsolete rugosa. 
Anfractus 10. Apertura suborbicularis, leviter Ee plicis 
duabus albis, et interdum laminis 3 vel 4 internis. 
First noticed by Lister; found in Muiahire; Kent, 
and Dorsetshire. 
48. 
biplicatus.T. testa turrita, opaca, striata ; anfractibus contrariis 
apertura postice bidentata, minus contigua. 
2a 2. 2 2 Schrot. 
