306 MYTILUS. 



the opposite margin, a quarter of an inch, breadth half an 

 inch, but usually much less ; though we have one specimen 

 full three quarters of an inch wide. It is readily distinguish- 

 ed from the young of the Mytilus rugosus by the larger end 

 being truncated, and not rounded, and by the valves being 

 unequal." 



fuscus. 13. Shell oblong, smooth, incurved, with 

 the posterior side sub-cylindrical, and the 

 other compressed ; umbones prominent and 

 incurved. 



Mytilus fuscus. Gmelin, p. 3359- 



Mytilus brunneus. Solanders MSS. Portland Cat. p. 104. 

 lot 2275. Callone's Cat. p. 43. No. 798. 



Mytilus, No. 25. Schroeter Einl. iii. p. 459- 



Lister Conch, t. 359- f. 197. 

 Inhabits the East Indies ? and lives in stones. Humphreys. 

 Shell about three quarters of an inch or an inch long, and not 



much more than one third as broad ; it is ventricose, and of 



a brown colour. 



arborescens. 14. Shell sub-cylindrical, smooth, 

 compressed at the margin, and marked over 

 one half with minute branching lines. 



Mytilus arborescens. Chemnitz, xi. p. 251. t. 198. f. 2016 



and 2017. 

 Mytilus ornatus. Solander's MSS. Portland Cat. p. 135. 



lot 2994. 

 Mytilus. Enc. Meth. t. 221. f. 2. 

 Tamarindiformis Dendrites. Mus. Gevers. p. 412. No. 



1424. 

 D'Avila, t. 19- f. Z. Favanne, t. 50. f. G. 



Inhabits the coasts of St. Domingo. Chemnitz. China. Hum- 

 phreys. 



Shell about two inches and a quarter long, and one inch broad ; 

 of a yellowish colour ; the valves are divided diagonally into 

 two parts, of which one is plain, and the other ornamented 

 with minute irregularly branched lines of a dark brown or 

 blackish colour. 



plicatus. 15. Shell rhomboidal, inequilateral, 

 striated and wrinkled transversely, and the 

 summits inflected. , 



