Soe GINGLYMACONCHA. PINNADZ. 
Linn. Soe. viii. 108 ; Flem. Edinb. Encyel. vii. 99; Dill. 
Desc. Cat. 211; Turt. Conch. Dict. 111. 
Var. 3. Mytilus umbilicatus, Penn. Brit. Zool. iv. 112. t. Ixy. 
yO: 
Modiola papuana, Lam. Hist. Nat. des Anim. sans Vert. vi. 
partsajiil. 
Mytilus barbatus, Gualt. Test. t. xci. f. u. ; Linn. Faun. Suec. 
2157; Syst. Nat. xii. 1156. no. 252 ; Chem. Conch. viii. t. 
Ixxxiv. f. 749; Pult. Cat. Dorset. 38. t. xii. f. 5, dextra; 
Donov. Brit. Shells, t. xx.; Mont. Test. Brit. 161. 
Musculus obscurus pilosus, Ginan. Conch. Adiat. ii. 36. t. xxvii. 
f. 169. 
Mytilus curtus, Penn. Brit. Zool. iv. 112. t. lxiv. f. 76, a, 
young. 
Mytilus subumbilicatus, Penn. Brit. Zool. iv. 112, distorted. 
Inhabits the Atlantic, European, Mediterranean and Adriatic 
seas, generally in very deep water. 
Dr. Goodall found this species at Sandersfoot and Wey- 
mouth; I have observed it in Salcombe Estuary, Sandgate, 
Little Hampton, the Hebrides, the Friths of Clyde and Forth, 
and have received specimens from the Orkneys. 
2. Mytitus GIBBSIANUS. 
Shells with their valves covered with a fuscous epidermis ; 
under the epidermis whitish ; internally whitish, reddish be- 
hind; the anterior side sinuated; the hinder side with a 
rounded wing. Length two inches and one-eighth; height 
one inch. 
Modiola Gibbsu, Leach, Zool. Miscel. ii. 34. t. Ixxii. f. 2. 
Mytilus modiolus, var. c., Turt. Conch. Dict. 112. 
This new species was first discovered by Mr. J. Gibbs, for- 
merly collector for Col. Montague, who pointed it out to me 
as a new species. The epidermis is serrated, and a red spot 
on the inside of each valve distinguishes it decidedly from the 
young of M. papuana. 
