320 MYTILUS. 



impactus. 42. Shell transversely oval, somewhat 

 four sided, very convex, with the two sides 

 longitudinally ribbed, and the middle trans- 

 versely wrinkled ; inside iridescent. 



Mytilus impactus. Herman Naturf. xvii. p. 147- t. 3. f. 5 



to 8, and xix. p. 183. 

 Mytilus discors Oceani Australis. Chemnitz, viii. p. 195. t. 



86. f. 768. 

 Mytilus Cor. Martyn Universal Conch, ii. t. 77. 

 Mytilus lanatus. Callone's Cat. p. 43. No. 796. 

 Mytilus discors, Var. Schroeter Einl. iii. p. 445. Gmelin, 



p. 3356. 

 Anodonta. Em. Method, t. 204. f. 5. 

 Born Mm. Vign. at p. 121. f. d. 

 Inhabits the coasts of New Zealand. Solander, «Sfc. 

 Shell sometimes an inch long, and an inch and five lines broad ; 

 of a purplish brown colour, and covered with a darker epi- 

 dermis ; the three compartments are as observable on the 

 inside as on the out, and the former is remarkably iridescent, 

 by which, as well as its much larger size, this species may be 

 distinguished from M. discors. It is said to be always found 

 in clusters, enveloped in a yellowish silky Byssus. 



fab a. 43. Shell roundish-oval, ventricose, longitu- 

 dinally striated, and the margin crenulated. 



Mytilus Faba. Muller Zool. Dan. Prodr. No. 3015. 

 Fabricius Fauna Granlandica, p. 418, No. 419- Chem- 

 nitz, viii. p. 184. t. 85. f. 761. Gmelin, p. 3359. 

 Mytilus decussatus. Montagu Supp. p. 69- ? 



Inhabits the coasts of Greenland. Fabricius. 



This shell is said to be about the size of M. discors ; white, 

 coated with a reddish epidermis, and the inside pearly ; it is 

 longitudinally striated, and has the margin crenulated through- 

 out. Mr. Montagu says that a single valve of his M. decus- 

 satus has been taken on the coast of Scotland, and he sus- 

 pects it may belong to this species. 



hirundo. 44. Shell smooth, with two lateral lobes, 

 of which that on the side of the hinge is 

 much larger than the other. 



Mytilus Hirundo. Linnaus Syst. Nat. p. 1159- Born 

 Mus. p. 129- Chemnitz, viii. p. 136. t. 81. f. 722. 

 Schroeter Einl. iii. p. 446. Gmelin, p. 3357. Brooks's 

 Introd. p. 86. t. 4. f. 50. 



