142 



more than that it is scarcely distinguishable from it malacolo- 

 gically. The shell is rather more convex, the posterior end 

 shorter, more arcuated and scabrous, not quite so broad, and 

 the ossicle somewhat more wiry than in A. phaseolina : the 

 two when adult are about the same size. 



I am the original discoverer, more than thirty years ago, 

 and named it specifically intermedia, by which appellation 

 it was long known on the Devon coasts, and in private collec- 

 tions, but I neglected to substantiate my claim by publication. 

 Agreeably to the ' British Mollusca/ i. p. 224, Mr. Macgillivray 

 described and named it Anatina villosiuscula, in Jameson's 

 Edinburgh Philosophical Journal, 1827. Of course by my 

 laches I lost my discovery ; but it is strange that Professor 

 Macgillivray, in his ' Mollusca ' of Scotland, in 1844, passes 

 over his own previous notes and my discovery without the 

 slightest recognition. It is possible the learned Professor may 

 have had reason to doubt the honour of paternity, and thus 

 handsomely consigned it to the care of the " vrai Amphitryon." 

 Consequently, under this view, I feel that I am morally, if not 

 strictly, entitled to take care of my own bairn. 



A. NORVEGICA, Chemnitz et nobis. 



Lyonsia norvegica, Brit. Moll. i. p. 214, pi. 8. f. 6-9; (animal) pi. H. 



f. 3. 

 Mya norvegica, Auctorum. 



Animal elongated, rather thick, of a pale brown aspect, 

 except the foot; the liver is grass-green. The mantle is 

 closed, leaving only an opening for the foot close to the poste- 

 rior end. The margin of the pedal aperture is strongly scal- 

 loped, marked between the dentations with black points, as 

 well as on the sutural line of the mantle for some distance on 

 both sides of it. The foot is pure white, flat, broad at the 

 base, tapers to a point, and is cloven at the heel, from whence 

 byssal filaments issue. The siphonal processes are two short 

 tubes, which appear enclosed in one sheath, that has the 

 margin finely dentated ; each orifice is garnished with about 

 eight white simple cirrhi and as many black equidistant points 

 at their external edges ; the surfaces of both tubes when ex- 



