GINGLYMACONCHA. UNIONIDZ. O27 
f. 1; Donov. Brit. Shells, t. lv.; Mont. Test. Brit. 179; 
M. § R. Trans. Linn. Soc. viii. 109 ; Flem. Edinb. Encycl. 
vu. 99; Lam. Hist. Nat. des Anim. sans Vert. vi. part. i. 
85; Dill. Desc. Cat. 317; Turt. Conch. Dict. 116. 
Mytilus stagnalis, Sow. Brit. Miscel. t. xvi.; Turt. Conch. 
Dict. 115. 
Testa junior. 
Mytilus anatinus, Lister, Anim. Angl. t. ti. f. 29 ; App. t.i. f. 2; 
Conch. t. clv. f. 8; Petiv. Gaz. t. xcii. f. 8; Gualt. Test. 
t. vu. f. 3; Linn. Faun. Suec. 2158; Syst. Nat. xii. 1158. 
no. 258; D’ Argenv. Conch. t. xxxi. f. 10, med.; Miiil. 
Verm. Hist. ii. 207 ; Schroét. Fluss. 160. t.i.f. 1, 2; Penn. 
Brit. Zool. iv. 113. t. Ixvii. f. 59; Da Costa, Brit. Conch. 
22%. 1. xvii. f..1; Pult.. Cat. Dorset. xxviii. t. xi. f. 6; 
Drap. Hist. des Moll. terrest. et fluv. 134. t. xii. f. 1; 
Mont. Test. Brit. 171 ; Flem. Edinb. Encycl. vii. 99 ; Lam. 
Hist. Nat. des Anim. sans Vert. vi. part. i. 85; Dill. Dese. 
Cat. 317; Turt. Conch. Dict. 116. 
Mytilus Avonensis, Mont. Test. Brit. 172; Flem. Edinb. 
Encycl. vu. 99; Turt. Conch. Dict. 116. 
Anodonta intermedia, Lam. Hist. Nat. des Anim. sans Vert. vi. 
part. i. 86. 
Mytilus anatinus, 6., M. § R. Trans. Linn. Soc. viii. 110. 
Animal pale saffron ; abdomen luteous; the foot, especially 
at its extremity, deep saffron ; the lips saffron inclining more 
or less to fuscous ; the branchize lutescent ; the orbicular mus- 
cle saffron, generally blackish behind ; the tracheal fringes lu- 
teous ; the region of the respiratory or tracheal tubes generally 
brownish. 
The Mytilus stagnalis of English writers is merely a gigan- 
tic growth of this shell, which in its common adult state has 
generally been considered to be the Mytilus cygneus of Linnzeus, 
who expressly observes, ‘‘ habitat ad ostia fluviorum ;”’ whereas 
our shell is never found within the influence of the tide, but 
resides entirely in fresh water. The younger state of this spe- 
cies is most decidedly the Mytilus anatinus of Linnzeus, Mon- 
tague, and most other naturalists; Mytilus Avonensis is merely 
