GINGLYMACONCHA. AMPHIDESMAD. 279 
3. AMPHIDESMA BoysIANA. 
Shells white, opake, glossy, somewhat compressed and pris- 
matic, very finely striated concentrically, abruptly acuminated 
and rounded behind. Length seven-eighths of an inch ; height 
five-eighths. 
Mactra Boysii, Mont. Test. Brit.i.98; M.§ R. Trans. Linn. 
Soc. viii. 72. t.i. f. 12; Turt. Conch. Dict. 84; Dill. Desc. 
Cat. 143. 
Ligula Boysii, Mont. Test. Brit. Supp. 23; Flem. Edinb. 
Encycl. vii. 88. 
Amphidesma Boysu, Lam. Hist. Nat. des Anim. sans Vert. 
Ae 
Inhabits most of the sandy coasts of Great Britain, more 
especially in deep water. It is a favourite food of the Cod, 
Gadus Morrhua, and is frequently obtained in fine condition 
by examining the stomach of that fish. It is sometimes thrown 
on shore during storms. 
Genus 27. EvPOLEME. 
Shells very much compressed, longer than high, rounded 
before and behind ; umbones subcentral. Hinge in each valve 
with a lamella before and behind the umbones. The process 
which bears the ligament small ; that of the left valve having 
a tooth, which is situated before the ligament. 
EUPOLEME CANCELLATA. 
Shell white, thin, pellucid, suborbicular, exquisitely sculp- 
tured, resembling network of the finest lace. Length half an 
inch ; height three-eighths. 
Solen squamosus, Mont. Test. Brit. Supp. Add. 565; M. & 
R. Trans. Linn. Soc. vin. 48; Flem. Edinb. Encycl. vii. 
87; Dill. Desc. Cat. 70; Turt. Conch. Dict. 164. 
Inhabits the deep water, on a sandy bottom, off the coasts 
of Devonshire, but is excessively rare. 
It was discovered by Montagu, who found a single valve 
amongst sand dredged up in Salcombe Bay, where it was again 
