216 



MANUAL OF THE MOLLUSCA. 



Sub-genera. Terebratulina (caput-serpentis) D'Orb. PI. XV. fig. 3. 

 Fig. 112. Shell finely striated, auriculate, deltidium usually rudimental ; 



Fig. 112. Dorsal valve: Animc 



foramen incomplete ; loop short, rendered annular in the adult by the union 

 of the oral processes. List. 7 sp. U. States, Norway, Cape, Japan. 10 

 1 20 fms. Fossil, 20 sp. Oxfordian . U. S. Europe. 



WaW.heim.ia (australis) King. PI. XV. fig. 4 (p. 8, figs. 4, 5.) figs. 109, 

 113, 114. 



Fig. 113. Dorsal valve. 



Fig. 114. Ventral valve. 



Fig. 113. j, cardinal process; t', dental sockets ; p, hinge-plate; s, septum; c, 

 crura of the loop ; I, reflected portion of the loop ; m, quadruple adductor-impression. 



Fig. 114. /, foramen; d, deltidium; t, teeth; o; single adductor-impression; r, 

 cardinal 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 com 

 plete ; loop elongated and reflected ; septum (s) of smaller valve elongated 

 Distr. 9 sp. Norway, Java, Australia, California, Cape Horn. Low- water 

 100 fms. Fossil, 60 sp. Trias . S. America, Europe. Eudesia (car 

 dium) King, includes 1 recent, and 6 fossil species which are sharply plaited 

 T. impressa (PL XV. fig. 5) is the type of a group which has the externa 

 shape of Terebratella. 



