292 OSTREAD^. 



The Pecten glaher of Montagu,* taken by Mr. Laskey 

 near Dunbar, agrees better with this than with any other 

 of our known native species ; neither figure (Suppl. pi. 28, 

 f. 6) nor description (both, we beheve, taken from a single 

 valve) being absolutely at variance with one of the many 

 varieties of this polymorphous shell. So many of the 

 supposed Dunbar species having turned out to be foreign, 

 this too may possibly prove an exotic Pecten; never- 

 theless, we cannot, after studious examination, ascribe 

 the species in question, with positive certainty, to any 

 member of this extensive genus. As to the glaher \ of 

 Pennant (Brit. Zool. ed. 4, vol. iv. p. 102 ; copied, Mont. 

 Test. Brit. p. 150), his description is so brief and inade- 

 quate, that unaccompanied as it is with any representa- 

 tion, its determination must be purely conjectural ; it 

 certainly does not appear to be identical with that of 

 Linnseus, which is a well known species of the Mediter- 

 ranean. 



This beautiful shell was first announced with certainty as 

 a British species by Captain Thomas Brown, who described 



* " Mottled with rufous brown and yellow, thin, and nearly smooth, but not 

 glossy ; it has seven rounded raj's, not much elevated : the ears are nearly equal, 

 and large, one is reticulated, the other only striated. The inside is sin- 

 gularly marked with twenty-one slender rays, the sixteen middle ones are 

 placed in fours ; that is to say, there are four rays between the sulci that form 

 the rays on the outside, and the two middle of these series of quadruplicate rays 

 approximate ; the others are remote : the colour is paler than the outside, except 

 at the upper part about the hinge. Length, three quarters of an inch, breadth 

 rather less. In the specimen before us there is some slight appearance of interme- 

 diate rays in the depressions that separate the evident ones, and which are 

 formed by the sulci between the approximate rays on the inside. Those who are 

 fortunate enough to obtain the shell will observe by the assistance of a pocket 

 lens, that it is most minutely striated concentrically, but does not possess any 

 longitutlinal striae, like P. ohsolctus.'''' (Mont. Test. Brit. Suppl. p. 60.) 



"Y " P. with a very thin shell, fifteen faint rays, equal ears. The inner side of 

 the shells marked with rays, divided by a single sulcus. Anglesea. A scai'ce 

 species. Small." 



I 



