550 BULLION. 



where it exhibits some sHght disposition to be reflected ; 

 hence the area behind it is somewhat hollowed ; occasion- 

 ally, too, there is an indistinct subumbilicus. Fine speci- 

 mens occasionally attain to the third of an inch in length, 

 and a quarter of an inch in breadth.'"" 



The animal of this species has been carefully examined 

 and described by its discoverer, and an account of it has 

 also been given by Loven. It is white, speckled with 

 flaky spots. The capital disk is quadrate-ovate and emar- 

 ginate in front ; the margin of the lateral lobes or reflexed 

 sides of the foot are laciniated ; the posterior margin of 

 the mantle is incised. 



It was originally found by Mr. Olark at Exmouth. 

 Mr. Alder has taken it on the Northumberland coast, and 

 Dr. Fleming in the Frith of Forth. Mr. Barlee finds it 

 in Loch Fyne and elsewhere in the Hebrides, and on the 

 Avest coast of Ireland. We have taken it in as deep as 

 seventy fathoms water on muddy ground in the Hebrides 

 (M'Andrew and E. F.). It occurs in Zetland. Loven 

 records it as an inhabitant of the Norwegian seas. 



The fry, or broken examples, of two species of BiiUidcB, have been raised to 

 the rank of species by the older Adams, whose wretched attempts at delineation, 

 and still more imperfect style of description, have rendered their determination 

 conjectural. The first of them is supposed by Mr. Jeffreys (who has bestowed 

 much pains on the almost hopeless task of identifying the obscure species of that 

 writer) to be the fry of aperta, the second to be drawn from a (broken) very 

 young liyaUna. 



Bulla de/iiicuhda, Adams, Trans. Linn. Soc. vol. v. pi. 1, f. 3, 4, 5, from which 

 Mont. Test. Brit. p. 217; Maton and Rack. Trans. Linn. 

 Soc.vol. viii. p. r2'2; Turt. Conch. Diction, p. 27; Fleming, 

 Brit. Animals, p. 294. — Brown, 111. Conch. G. B. p. 57, 

 pi. 19, f. 25, 26. 



* The drawing of the U. veiitrosa of Searles Wood (Crag Moll. p. 102, pi. 21 , 

 f. 11 ) looks very like an adult pruinosa ; but the outer lip of the recent species 

 is not " deeply cleft or sinuatod, and disconnected up to the vertex." 



