19 Dr. Maton’s and Mr. Rackert’s 
nated M. Listeri by Gmelin, in compliment to that la- 
borious and accurate author. 
8. | . 
tenuis. M. testa compressa, subtriangulari, equilatera; cardinis 
dente in altera valvula PARURE et dentibus laterali- 
bus remotis. see 
Montagu Test. Brit. p. 572. - —  Supplen. LI FT 
Halitat in mari, ad littora. 
Testa + poll. longa et lata, vel paululum major, tenera, sénipelucida, alba, 
rugis concentricis; intus lzvis, glabra; cicafrice conica, lata. Valvula 
una dente bifurcato et dentibus duobus lateralibus lamellatis remotis ; 
altera dente simplici; foveola in utraque. Umbo centralis, productior. 
- Distinguitur a M. Listeri, dentibus lateralibus; a testis junioribus M., 
solide et M. Stultorum facie et dentibus primariis, et quod una temm 
valvula gaudeat dentibus lateralibus. (Montagu.) - 
. Discovered by Mr. Montagu at Southampton; found 
also by Mr. Bryer at Weymouth, Dorset. 
9. 
triangu- M. testa. subtriangulari; altera valvula dente unico 
laris. Crasso “bifido, altera fossula triangulari inter denti- 
culos duos. M seeds Test. Brit: P- 99. b 3. y 5. 
Habitat in mari, rarior. 
Testa diametro + poll. crassa, opaca, s; albi, vba pom Gaoi pro- 
minentes, obtusi. Margo crenatus. 
Discovered by Mr. Montagu in Falmouth Harbour, 
and on the South coast of Devon. 
OPI ciety) i in v Hutch. Dorset. * 5. F X 
Habitat in man. ee DAE 
Testa magnitudine faboe minoris, sehen, alba, convexa, margine postico ro- 
OS tundato, 
* 
