MARSHALL: ADDITIONS TO "BRITISH CONCH-OLOGY," 1S3 



Galeomma differs from all other bivalves in that it attaches itself to 

 the undersides of stones with the valves open, like an open book laid 

 page downwards, and in this position no part of the shell is visible, 

 the animal, which resembles a small lump of opaline jelly, and highly 

 distended with water, enveloping the whole shell with the mantle. 

 When detached, the Galeomma very slowly and gradually draws the 

 valves together, there being some difficulty in finding room within the 

 valves. 



I have taken the very young, about a line in length, during the 

 month of May ; in this stage the shells are extremely delicate, and 

 under the lens appear like a membrane. 



Their habitat under somewhat large stones, and the fragility of their 

 shells render the latter peculiarly liable to fracture, and they are fre- 

 quently found in a mended state. One specimen in my cabinet has 

 been completely crushed, and the pieces, lying in confusion one over 

 the other, are held together by a new shelly film formed inside. 

 Other specimens are abnormally thickened by successive layers of 

 shelly material, also formed on the inside of the shell. 



In ordinary specimens, a more or less shallow furrow runs down the 

 centre of each valve, a feature omitted from the published figures. 



An interesting paper "On the Animal of Galeomma," by Dr. 

 Philippi, will be found in xA.nn. Mag. N. Hist, 1839, vol. iv., p. 92, 

 with figures. 



Lepton squamosum Mont. — Milford Haven (Vaughan and 

 Span) ! This tends to confirm the record " Tenby (Lyons and 

 Hanley)," given in "British Mollusca," as to which there had been 

 some doubt; off Loch Ryan 25f., a single damaged valve. The 

 only previous Scotch record — -"Oban (Barlee)"^requires confirmation. 



L. nitidum Turt. — Mr. William Baillie, of Brora, obtains this 

 species habitually from the stomachs of haddocks. Dredged in Korea 

 Straits 36f , with var. hevis Jeff.! The latter variety is an unpunctured 

 form of the type, and also L. prismaticiim of Monterosato. 



var. lineolata Jeff — Guernsey 2of , Scilly 4of, The longitudinal 

 sculpture in this variety is similar to that of Z. clarkice. 



var. pisidialis Jeff. — With the type from haddocks (Baillie)! off" 

 Loch Ryan 25f., Mull of Cantire 26f. Figured in "Crag Mollusca," 

 vol. iii., tab. ix., fig. 7b. 



L. sykesii Chast. — Scariff, S.W. Ireland, 4of. (R.I. A. cruise). 



L. sulcatulum Jeff. — Alderney (Marquand)! Benbecula Sound, 

 in the Hebrides, from shallow water ; valves only ; a remarkable 

 locality for this southern species. For many years it was known only 

 from the Channel Islands, but I have taken it in the Scillies and at 

 the Land's End, and it has also been recorded from the Isle of Man. 



