190 SUPPLEMENT. 



Vol. III. p. 3. — SoLECTJRTrs cAXDiDrs. F. Boulder- clay, 

 Caithness (Peach) ! ; Monte Mario (Conti and Rigacci) ! ; Pa- 

 lermo (Aradas) ! ; Rhodes (Mus. J. d. PI.) ! AVhen this mol- 

 lusk is laid on its back, the ralves are fully expanded, and it 

 is kept in its place by a pair of thread-like muscles, which 

 cross each other as if it were tied in that way. 



P. 4, 1. 6 from bottom, dele " 1." 



p, 6, — S. AXTiQUATUS. Pscimmohia antiqiia, Risso. 



P. 10. — Caratisolen LEGrMEX. Mersey estuary (CoUing- 

 wood). F. Vesuvius (Guiscardi). 



P. 14. — SoLEN PELLUciDUS. F. Xot Coralline Crag ; Monte 

 Mario (Conti) ! E. Bay of Biscay (Beltremieux and others)! ; 

 Naples (Acton) ! 



p. 16. — S. Exsis. F. N.W. Germany (Philippi)'; Maine 

 (Packard). E. Norway, from Finmark southwards, shore — 

 10 f. (Sars). 



p. 18. — S. siLiauA. F. Norway and Italy. E. Norway, 

 from Bergen southwards (Sars). Ensis magmis, Schumacher. 



P. 23. — Paxdora. Dr. Morch informs me that Hvass was 

 not a German but a Danish justiciary, and that he was for 

 many years secretary to the Danish Embassy at Paris, when 

 Bruguiere, Lamarck, and Schumacher (at that time medical 

 students) assembled every week at his house at Auteuil. 



P. 24. — P. ix^QUivALvis, var. ohtusa or Pinna. F. Monte 

 Mario (Rigacci). 



P. 25, 1. 7 from bottom, for " 10 " r. « 100 ". 



P. 29. — Lyonsia Norvegica. E. N.W. America (P. Car- 

 penter) ; not Sea of Okhotsk, Middendorff's species being L. 

 arenosa. 



p. 33.— Thracia. Described by De Blainville in 1825. 



P. 34, 1. 16 from top, for " Odoncincta " r. " Odoncineta^\ 



P. 34. T. PR^TEXUIS. 



BoDT clear white : mantle pouting at its edges, which are 

 plain: tubes short; branchial tube forming a wide slit, and 

 nearly sessile ; excretal tube (which is only now and then 

 protruded) longer and conical : foot large, lancet-shaped. 



F. Monte Mario (Conti and Rigacci)! ; Rhodes (Mus. J. d, 

 PI.)! E. Algeria (Weinkauff) ! 



