33 
had not been disturbed when brought to me. There was 
°o byssus. The same species is sometimes found on the 
shore. 
* M. DISCREPANS. Mytilus D. Mont. Test. Brit., 
v °)< 1, p. 1(39. Modioia D. Flem. Brit. An., p. 413. 
■Abundant on rocks, attached by a byssus to the stems of 
l, ‘e common Coralline. It is also frequently found embed- 
ded in the substance of a species of ascidia : in a manner 
pot easily to be accounted for, but in which situation 
grows to a much larger size than when openly exposed, 
a nd with much more beautiful colours. W hen thus en- 
olosed, the syphon pierces the tunic of the animal, and 
-thus preserves its commuication with the water. 
iV1 - DISCORS. Mytilus D. Mont. Test. Bril., vol. 1, 
P- 107. Modioia D. Flem. Brit. An., p. 413. Common, 
but less abundant than the last species; I have never found 
11 buried under the tunic of an Ascidia, like the last named 
a Pecies. 
CrIBBSii. Flem. Brit. An., p. 413. Of this rare spe- 
cies i [lave seen on iy one specimen, presented by a Lady. 
iVI - BARBATU8. Mytilus Curtus. Turt. Lin. Pen. Brit. 
Zo. vol. 4, pi. 64, fig. 76. M. B. Mont. Test. Brit., 
v °l. 1, p. 161. 
Br. Fleming confidently pronounces this to be a variety 
0 Modiolus Vulgaris ; with which opinion neither Montagu’s 
?° r mine can agree. It is not rare ; but whether the follow- 
|P§ is a younger growth or separate species, must be left for 
"rther research. It is provisionally named, for it differs 
JP^siderably from a foreign shell marked M. Barbatus in 
,. le museum of the Royal Institution ; and I have found 
ae Cornish shells so named, so commonly fixed amongst 
P e ®imens of Mytilus lucurvatus, a shell which from its 
P x posed situation soon becomes naked and worn, that I have 
r °pbted whether it be not the young of that species; an 
% Pinion which seems to have been held by Pennant. 
M. MINUTUS. It is minute ; and many specimens were 
f °und among a multitude of the Kellia rubra, studding 
tlle fibres of a small green sea weed, on which they appear 
have been feeding. It is about as deep as long, and 
along the side of the hinge thinly studded with short firm 
J airs. It is not attached by a byssus, and seems capable 
°* motion, like the Kellia. 
r MYTILUS. 
ENERIc CHARACTER: Shell longitudinal, the valves 
PTml, regular, pointed at the base, fixed by a byssus. 
Beaks almost strait, terminal, pointed. Hinge lateral, 
Usually without teeth. Ligament marginal, subinternal. 
Uae elongated, clavate, sublateral muscular impression. 
v 
