364 



MANUAL OF THE MOLLUSCA. 



Distribution, 3 species. Mediterranean 90 — 250 fathoms on 

 nTillipore mud. (Forbes.) Vigo Bay ; Falkland Islands. 



Fossil, 126 species. Devonian — . World-wide. 



Sub-genera. Tereliratulina (caput-serpentis), D'Orbigny. (PI. 

 XV., Fig. 3.) Fig. 148. Shell finely striated, auriculate, 



Fig. 148. Dorsal valve. Animal, -S-. 



deltidium usually rudimental ; foramen incomplete ; loop 

 short, rendered annular in the adult by the union of the oral 

 processes. Distribution, 6 species. United States, Norway, 

 Cape, Japan. 10—120 fathoms. Fossil, 22 species. Oxfordian — . 

 United States. Europe. 



Waldheimia (australis), 

 5, 6), Figs. 145, 149, 150. 



King. PI. XV., Fig. 4 (p. 5, Figs. 



Fig. 149. Dorsal valve. 



Fig. 150. Ventral valve. 



Fig. 149. J, cardinal process ; t', dental sockets ; p, hinge-plate ; s, septum ; c, crui-a 

 of the loop ; /, reflected portion of the loop ; m, quadruple abductor-impression. 



Fig. 150. /, foramen ; d, deltidium; t, teeth ; a, single abductor impression ; r. car- 

 dinal muscles ; x, accessory muscles ; p, pedicle muscles ; v, position of tke vent ; z, 

 attachment of pedicle-sheath. 



Shell smooth or plaited, dorsal valve frequently impressed ; 

 foramen complete ; loop elongated and reflected ; septum {s) of 

 smaller valve elongated. Distribution, 9 species. Norway, 

 Java, Australia, California, Cape Horn. Low water — 100 



