474 
+Arctica Schum., 1817. 
Cyprina Zam. ,1812 (nom. nudum) ; 
1818 cum descr., non Lz7., 1767 
Spherium Scop., 1777. 
Cyclas Brug., 1792. 
Nux Humph., 1797. 
Musculium Zzxk , 1807. 
Musculium 277%, 1807. 
Pisidium Pf, 1821. 
Pera Leach, 1832. 
Cyrenella Desh., 1835. 
Cyrenoida Joannzs, 1835. 
Cardissa Mh/f., 1811. 
Hemicardia K7ez, 1753. 
Hemicardium Cuv., 1817. 
Isocardia K7ez2, 1753, Lamk., 1799 
Glossus Po/z, 1795. 
Glossoderma Polz, 1795. 
Bucardia Schum., 1817. 
Bucardium, 7. von Muhif , 1811. 
Hindsiella Sto/iczka, 1871. 
Hindsia Desh., non H. & A. Adams, 
1853. 
Vasconia Fischer, 1873. 
Tridacna Brug., 1789. 
Chameetrachea A7e77, 1753. 
Axinus 7. Sozwd., 1821. 
Thyatira Leach, 1818 (nomen). 
Cryptodon 7zrt., 1822. 
Clausina Jef., 1847. 
Ptychina P/z/., 1836. 
Corbis Cuv., 1811. 
Gafrarium Bolten, 1797. 
Fimbria A/uh/f., 1811. 
Idothea Schum., 1817. 
Diplodonta Broz, 1831. 
Mysia Leach, in pte, 1827. 
Astarte /. Sowé., 1816. 
Tridonta Schum., 1817. 
Crassina Lamk., 1818. 
Cardita Zamk., 1799. 
Actinobolus A7/ezz, 1753. 
Dipsas Leach, 1814. 
Barbala Humph., 1797. 
Cristaria Schum., 1817. 
Dianisotis Raf, 1831. 
Anodonta Zammk., 1799. 
Anodon Ofen, 1815. 
MELVILL: THE PRINCIPLES OF NOMENCLATURE. 
Mutela Scof., 1777. 
Iridina Lamz., 1819. 
Hyria Zamk., 1810. 
Triquetra Alezm, 1757. 
Paxyodon Schum., 1817. 
Diplodon, Triplodon Sf7x, 1827. 
Miilleria 7., 1823. 
Acosteea a’ Orb., 1851. 
Modiolus 7z5s0, 1799. 
Perna Adanson, 1757. 
Modiola Zamz., 1801. 
Lithophagus 47. von Muhif., 1811. 
Lithophaga Bolten, 1798. 
Lithodomus Cuwzer, 1817. 
Dreissena P. v. Beneden, 1835. 
(Dreissensia form. subsq.). 
Tichogonia Rossm., 1835. 
Dythalmia Jay, 1836. 
Mytilina Cantr., 1837. 
Margaritifera P. Browne, 1789. 
Unionium Z27k, 1807. 
Margaritophora A/uAd7f., 1811. 
Meleagrina Lamk., 1812. 
Margarita Leach, 1814. 
Septifer Rec/uz, 1848. 
Septiger AZorch. 
Perna Srug., 1792. 
Isognomon A/e27, 1753. 
Melina ReZz., 1788. 
Sutura A/uh/f., 1811. 
Anadara Gray, 1847. 
Anomalocardia A7e777, 1753. 
Trisis Ofex, 1815. 
Parallelepipedum 47/ez7, 1753, in pte. 
Trisidos Bolten, 1798. 
Axinza Pol, 1795. 
Glycimeris Humph., 1798. 
Pectunculus Zamk., 1799. 
Limopsis Sassz, 1827. 
Pectunculina D’Oré., 1844. 
Trigonocelia Q. & G., 1835. 
Pecten J7i//., 1766 (Lamk., 1799). 
Vola K7lezz, 1753. 
Chlamys Bo/ten, 1798. 
Argus Polt, 1795. 
Janira Schum., 1817. 
Lima 4rug., 1789. 
Radula X7e77, 1753. 
t Arctica Schum., 1817. 
Both in this instance and in that of Sodzdula F. de Wald- 
heim and U?timus Mtft., I have some doubts whether the admission of such adjectival 
generic terms is strzctZy permissible. 
J.C., viii., Oct., 1897. 
