NO. 1210. SYNOPSIS OF NORTH AMERICAN TELLINIDyE—D ALL. 287 



to the two oceans, a.s, indeed, is an overwhelming proportion of the 

 wliole Arctic and boreal fauna, thoug-h largely mixed toward the 

 south with the fauna of the temperate regions, which is distinct. 



As the Tellinas are mostly inhabitants of moderate depths, their 

 distril)ution in latitude rarely affords anything remarkable. A few 

 species, like Mdconid Inflatula., manage to extend their range over the 

 northern l)order of the Panamic province by descending to considerable 

 depths, where they find their normal temperatui'e; and one species, 

 found in shallow water on the Texas coast, b}- some remarkable chance 

 still survives in deep water off' the coast of California, though not 

 known near shore. It may perhaps ])e a relic of the time when the 

 cold northern current, passing through the Suwanee Strait (now the 

 neck of the Floridian peninsula), carried a number of cold-water types 

 to the northern shores of the Gulf of Mexico, where several of them 

 have accommodated themselves to circumstances and still survive. 



The full synonymy of the genera and of such species as were repre- 

 sented in the Tertiary or Pleistocene beds of North America will be 

 found in the Transactions of the Wagner Institute, III, Pt. 5, now in 

 press. For the convenience of students I add a list of references 

 which will enable them to look up any of the species cited. 



I may add that for want of time and material, in the synopsis of the 

 group-names of the famil3\ no attempt has been made to include the 

 more or less prol)lematical groups of the Mesozoic which are the pre- 

 cursors of Tdllna and its allies. 



WORKS REFERRED TO BY DATES IN THE TEXT. 



1758. LiNNiEUS, Systema Naturie, 10th Edition. 

 1778. Da Costa, Britisli Conchology. 

 1780. Fabricius, Fauna Grunlandica. 

 1780. Born, Mns. Test. Vindobonensis. 

 1792. (tMElin, Systema Natune, I, Pt. 6. 



1797. Humphrey, Museum Calonnianum. 



1798. Spengler, Skrifter Naturistoriske Selskabet, IV. 



1799. Lamarck, Prodrome d'un Nouveau Classification des (Joiiuiiles. 

 1802. Bosc, Histoire Naturelle des Coquilles, III. 



1803-4. Montagu, Testacea Britannica. 

 1806. SowERBY, British Miscellany. 



1811. Megerle, Magasin der Gesellschaft Naturforschender Freunde zii Berlin. 



1812. Lamarck, Systeme des Animaux sans Vertebres. 

 1815. Wood, General C-onchology. 



1817. Schumacher, Essai d'un Nouveau Systeme des habitations des Vers testaces. 



1817. DiLLWYN, Catalogue of Recent Shells, I. 



1818. Lamarck, Animaux sans Vertebres, V. 



1819. Leach, Journal de Physique, LXXXVIII. 



1819. TuRTON, Conchological Dictionary of the British Islands. 

 1822. TuRTON, Dithyra Britannica, or Bivalve Shells of the British Islands. 

 1822. Say, Journal of the Academy of Natural Sciences of Philadelphia, II. 

 1824. Say, Journal of the Academy of Natural Sciences of Philadelphia, III. 



