194 Mr. Jeffreys on British Mollusca. 



Calyptraea Sinensis, ii. 463. At Helford River, Cornwall ; most 

 abundant and fine, both at low-water mark and dredged {Mr. Web- 

 ster). 



Puncturella Noachina, ii. 470. Belfast Bay. 



Emarginula reticulata, ii. 477. The fry closely resembles a Scissu- 

 rella, and has a regular Trochoidal spire, with the edges of the slit 

 inflected. 



E. rosea, ii. 479. Jersey {Rev. A. M.Norman). 



Haliotis tuberculata, ii. 485. Dr. Lukis informs me that in Mrs. 

 Collings's collection is a specimen, about an inch and a quarter in 

 length, in which the perforations were absent from the very earliest 

 period of growth, being quite a congenital deformity. And he adds 

 that, although the demand for ormer shells, as articles of com- 

 merce, is on the decline, one merchant had (in February last) at 

 least fifteen to twenty tons weight in store ; that at sorting-time every 

 shell is separately examined, and that the best lots fetch on the spot 

 for exportation about seven shillings and sixpence per hundredweight ; 

 and that the quantity brought to this merchant varied, in the season, 

 from four to nine tons. It appears to be found in Alderney, and 

 also (though rarely) in Jersey, 



Trochus alabastrum, ii. 497, var. alba. Zetland {Mr. Barlee). 



T. exiguus, ii. 505. Jersey {Rev. A. M. Norman). 



T. striatus, ii. 508. In dredged sand from Belfast Bay. 



T. Montagui, ii. 511. Jersey {Rev. A. M. Norman). An exqui- 

 site scalariform variety has been found by Mr. Waller and myself, by 

 dredging off the north-eastern coast of Ireland ; but it is very rare. 

 The animal does not differ from that of the usual form. 



Margarita exilis {Skeneal Cutleriana, hi. 164). Falmouth, rare 

 {Mr. Webster) ; Fowey, abundant in dredged sand {Mr. Barlee). 



M. cinerea, Gould, Inv. Mass. 252. Mr. Waller and myself have 

 each found a specimen in dredged sand from the Turbot Bank in 

 Belfast Bay. They appear to be recent, although not in good con- 

 dition. Mr. Hyndman has kindly furnished me with some shells 

 (principally Astarte sulcata) which were taken from a pleistocene 

 bed near Belfast, lying about 90 feet above the present level of the 

 sea. All of them want the transparence and gloss which distinguish 

 the shells supposed to be of Arctic origin and lately dredged in Bel- 

 fast Bay. Although the latter are not pleistocene, there may still 

 be a question whether they are not ^o*#-pleistocene, or the relics of 

 the glacial epoch, like Leda pygmcea. Area raridentata, and other 

 species, which apparently survive only in a few, but widely separated, 

 parts of that extensive region which was once subject to an Arctic 

 temperature. Loven has recorded M. cinerea as occurring in Fin- 

 mark. I have since found and examined a bed of pleistocene fossils 

 lying by the road-side about half-way between Larne and Glenarm, 

 about 80 yards from high- water mark, and 15 feet above it. It is 

 situate about ten English miles from the Turbot Bank. All the 

 shells contained in this bed appear to be decidedly of an Arctic cha- 

 racter, and include Hypothyris Psittacea ; but few of them, and those 

 having an extensive range of geographical distribution, have as yet 



