Descriptive Catalogue of the British Testacea. cV CEN 
- transversis rudis, antice compressa, production, postice rotundata; intus - 
> margaritacea. 
Varietas 6. 12 poll. longa, 3 poll. lata, margine antériore rectiusculo seu 
subarcuato, cardine versus extremitatem posteriorem. 
31. 
discors. M. testa ovali, cornea, subdiaphana, antice longitudina- 
Ebh 8. liter, postice transversaliter, striata. Linn. Syst. Nat. 
p.1159. n. 261. Linn. Gmel. p. 3856. 
Da Costa Brit. Conch. p. 221. t. 17. f. 1. 
| Born Mus. p. 121. vign. 
Chemn. Naturf. 10. t. 1. f. 8. 
— Conch. 8. t, 86. f. 764. 767. PRAA 
-> Pulteney in Hutch. Dorset. p. 38. t. 2. f. 1. 
ds Donovan Brit. Shells, t. 25. 1 
E co 
— — Montagu Test. Brit. p. 107... | 
-~ B.  Montagu Test. Brit. p. 169. M. Media. 
t. 3. f. O. Habitat in mari, sepius epidermide Ascidie@ Mentule, vel testaceis, et 
* fucis, bysso adherens. 
Testa3.poll.longa, 1lata,alba,rufescente-maculata, sub epidermide olivacea, 
tenuissima, fragilissima. Testa tribus areis distinguitur. Area antica 
striis constat ab umbonibus ad marginem exteriorem anticum, longi- 
tudinalibus ; tertia ab umbonibus ad marginem exteriorem posticum, 
fere transversalibus ; intermedia vel striis obsoletis transversalibus vel 
- Rp. plane nullis. (Linn.) ` 
[ ; Varietas 8. minor, minus convexa, antice rotundata, latior, striis solum 8 vel 
gin area juxta umbones ; absque maculis. 
First noticed as British by 1 Dr. Pulteney, ‘who sent it 
to Da Costa. Found sparingly on the Western coast. 
The variety was first noticed by Mr. Montagu, and is 
found at Southampton, Poole, and Ilfracombe, Devon ; 
ir and on the S. coast of Wales. 
19. precisus. 
