The colour brown and glossy. From a fresh water stream near Faversham: common.
Mytilus Punctatulus.
Fig. 40. M. subrhombiformis punctatus. The subrombic dotted muscle.
The colour pellucid white. From Sandwich: common.
Mytilus Discors.
Fig. 41. M. discors areis tribus distinctis. The divided muscle.
The colour opake brown. From Sandwich: not common.
Lin. S. N. 1159, No. 261. Da Costa Br. Conch, p. 221. Tab. 17. f. 1. where it is exactly described, and as badly engraved.