406 



MOLLUSCOIDEA 



PHYLÜM V 



Frenulina Dali. Subgenus of Muehlfeldtia. Recent. 



Terebratalia Beecher. Shell when adult like Terebratella, but passing 

 through a quite different series of metamorphoses. E-ecent. 



Dallina Beecher. Elongate Terehrataliae with a small cardinal process and 

 a ventral median sinus. Tertiary to Recent. 



Macandrevia King. Elongate Terehrataliae with dental plates and no 

 cardinal process. Recent. A subgenus of Budesia, according to Dali. 



Laqueus Dali (Frenula Dali). Like Terebratalia, but the loop has two 

 lateral processes connecting the ascending and descending branches. Recent. 



Fig. 609. 

 A, B, Kingeim lima (Defr.). Cretaceous ; England. Lateral and frontal aspect of loop, enlarged (after 

 Davidson). C, Specimen froni the Galeritenpläner of Salzgitter, i/^. D, Bxternal surface, enlarged. E, F, 

 Kingena friesensis (Schriifer). Upper Jura ; Gruibingen, Würtemberg. i/i. c, Crnra ; d, Dental sockets ; 

 e, Jugum ; /, l, Ascending and descending branches of loop ; j, Cardinal process ; r, Point of recurvatiire of 

 loop ; S, Median septum. 



Kingena Davidson (Kingia Schloenbach) (Fig. 609). Cretaceous ; Europe 

 and North America. 



PseudoJcingena Böse and Schlosser. Cretaceous ; Europe. 



Lyra Cumberland (Terebrirostra d'Orb.) (Fig. 610). Cretaceous; Europe. 



Fio. 610. 



Lyra neocumiensis (d'Orb.). 

 Lower Cretaceous ; Morteau, 

 Doubs. Natural size. 



Fig. 611. 



A, Trigonosemus elegans Koenig. White Chalk ; 

 England. Interior of dorsal valve, enlarged (after 

 Davidson). B, T. palissyi Woodw. Upper Cretace- 

 ous ; Ciply, Belgium. i/i. 



Trigonosemus Koenig (Fissurirostra, Fissirostra d'Orb. ; Delthyridea King) 

 (Fig. 611). Cretaceous; Europe. 



ificro^^m Deslongchamps (Fig. 612); Orw^Mk Deslongchamps ; Zeilleria 

 Bayle. Jurassic genera ; Europe. 



Äulacothy ris DovcviW^ (¥ig. 613). Trias to Cretaceous; Europe. Eudesia 

 King ; Orthotoma and Trigonella Quenst. ; Flabellothyris Deslong. Jura ; Europe. 



