GINGLYMACONCHA. VENERIDZ. 297 
Tellina rubra, Da Costa, Brit. Conch. 211. t. xii. f. 4. 
Var. a. Testis fasciis concentricis flavis albicantibus aut rubris 
ornatis. 
Var. 6. Shells ornamented with yellow, whitish or blue con- 
centric bands. 
This species is found on most of the muddy shores of En- 
gland and I'rance. 
STIRPS III. 
Shells with their valves equally convex, inequilateral, the 
hinder aspect very short and very obtuse; the umbones placed 
before or behind the middle; the left valve with two di- 
verging teeth, the right one with one tooth; a lamella placed 
behind and sometimes before the cardinal teeth. 
Genus 42. Donax. 
Shells transverse, equivalve, inequilateral. its hinder aspect 
very short and very obtuse ; the umbones situated behind their 
middle; two diverging cardinal teeth in the left valve, in the 
right one notched tooth ; with a lamella in each valve behind 
the cardinal teeth. 
The animal with equal free tubes ciliated at their extremities, 
the upper one shortest ; the foot elongated and acuminated. 
1. DoNAX VARIEGATA. 
Shells slender, very smooth, yellowish or purplish, with a 
broad band extending from the umbones to the inferior aspect. 
Length one inch and a quarter; breadth five-eighths of an inch. 
Tellina variegata, Lister, Conch. t. ccclxxxiv. f. 227; Bonanni 
Recr. t. n. f. 42; Mus. Kirch. f. 41. 
Donax complanata, Mont. Test. Brit. 106. t. v. f.4; M. & 
R. Trans. Linn. Soc. viii. 75; Flem. Edinb. Encycl. vii. 
7); Dill. Desc. Cat. 150; Turt. Conch. Dict. 42. 
Donax polita, Poli, Test. ii. t. xxi. f. 14. 
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