312 TEREBRATULID. 
branch off to the septum ; foramen complete. 2 sp. Cal., Japan. 
T. Californica, Koch (exxxy, 40). 
KINGENA, Davidson, 1852. Posterior part of the reflected 
portion of the loop broad, angulated, with the two angles bent 
down on each side and joined to the septum directly (not to the 
hzemal or septal processes), forming a broad ring, only intersected 
by the septum; exterior granulated ; foramen entire. 7. lima, 
Defrance (cxxxv, 43, 44). Cret.; Europe. 
MAGAS, Sowb., 1816. (Mannia, Dewalque, 1874 ) Shell smooth, 
conspicuously punctate, dorsal valve impressed, foramen angular, 
deltidium rudimentary; internal septum prominent, touching 
the ventral valve; reflected portions of the loop disunited. 3 
sp. U. Greensand—Chalk; Europe. Recent, 2sp. New Zea- 
land, Canaries. 7. pumila, Sowb. (exxxv, 48, 49). 
RHYNCHORA, Dalm.,1828. Like Magas, but hinge-margin long, 
straight, the large valve with an area. Cretaceous. JT’. costata, 
Dalm. 
MAGASELLA, Dall, 1870. Shell with the reflected portions of 
the apophyses united, forming a loop. Comprises most of the 
recent species of Magas. 7. Hvansii, Davy. 11 sp. N. Zea- 
land. 
ISMENIA, Gray, 1863. (Frenula, Dall, 1871.) Shell externally 
resembling Terebratella; apophyses broad and short, attached 
first by the septal process to a short stout septum, then recurved, 
the broad posterior edges of the reflected portion touching and 
blending with the septal processes and the adjacent part of the 
hemal processes, forming a funnel-shaped ring, into which the 
septum does not project; the lateral loops of the apophyses 
remain open in the adult. Brachia without a median spiral lobe. 
Recent; 7. sanguinea, Chemn. Fossil; Jsmenia pectunculus, 
Gray. Oxford Clay; France. 
BoucuArpiA, Davidson, 1849. 
Distr.—2 sp. Brazil, 13 fathoms. B. tulipa, Blainv. (exxxv, 
45-47). 
Beak prominent, with a minute apical foramen; deltidium 
blended with the shell; apophyses anchor-shaped, the septum 
being furnished with two short lamellee. 
PLATIDEA, Costa, 1852. 
Syn.—Morrisia, Davidson, 1852. 
Distr.—3 sp. Mediterranean, W. Ind., Isle Bourbon. Fossil, 
4sp. Chalk—; Europe. P. anomioides, Scacchi (cxxxv, 50-52). 
Shell minute, conspicuously punctate; foramen large, en- 
croaching equally on both valves; hinge-area small, straight ; 
loop not reflected, attached to a small forked process inthe centre 
of the valve. 
