364 



MANUAL OF THE MOLLUSCA. 



Distribution, 3 species. Mediterranean 90 — 250 fatKoms on 

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

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

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



XY., 



Shell finely striated, auriculate, 



Fig. 148. Dorsal valve. Animal, ^. 



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). King. PI. XY., Pig. 4 (p. 5, Pigs. 

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



i 

 — Z 



rig. 149. Dorsal valve. 



Fig. 150. Ventral valve. 



Fig. 149. J, cardinal process ; t\ dental sockets ; p, hinge-plate ; 5, septum ; c, crura 

 of the loop ; I, 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 the 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 



