294 GINGLYMACONCHA. VENERID2Z. 
1. PSAMMOBIA INCARNATA. 
Shells white, oblong-ovate, very finely striated transversely, 
ornamented with rosy bands; the area of the anterior angle 
with decussating strie. Length two inches; height three- 
quarters of an inch. 
Tellina incarnata, Lister, Anim. Angl. App. t.1. f. 8; Conch. 
t. ecexciv. f. 241; Penn. Brit. Zool. iv. 88. t. xlix. f. 32. 
Tellina Ferroensis, Pet. Gaz. t. xciv. f.9; Puit. Cat. Dorset. 
29. t. vi. f. 13; Mont. Test. Brit. 55; M. & i tee 
Linn. Soc. viii. 49; Flem. Edinb. Encycl. vu. 29; Dill. 
Dese. Cat. 77; Turt. Coneh. Dict. 171. 
Tellina angulata, Born. Mus. t. u. f. 5. 
Tellina radiata, Da Costa, Brit. Conch. 209. t. xiv. f. 1. 
Tellina Bornei, Gmel. Syst. Nat. 3231. 
Tellina trifasciata, Donov. Brit. Shells, t. ix. 
This species is found on the northern and western coasts of 
England; is very common in the Orkneys, Shetland and Ferée 
Islands, and has been found on the coasts of Iceland. 
It was first discovered by Lister, at Scarborough in York- 
shire. 
Genus 40. TELLINA. 
Tellina, Auctorum. 
The shells thin, transverse or orbicular, most generally flat- 
tened, with its hinder aspect angulated, with its margin either 
inflexed or marked with an irregular fiexuous fold; the hinge 
with two teeth in the left valve, the anterior one very minute, 
the hinder one irregularly bidentate, the posterior lacinia much 
shorter, with an elongate-triangular lamella; in the right valve 
one equally bidentate tooth with avery small tooth behind it. 
The animal with its tracheal tubes unequal, cylindrical, dis- 
jomed, excepting at their base; the under one longer and 
broader ; the foot lamelliform, elongate and acuminated. 
1. TELLINA TENUIS. 
Shells ovately trigonal, very thin and rather flat, with very 
fine concentric striz, reddish, above with narrow white striz ; 
