26 
CEETACEOUS BEACITIOPODA 
iwoducto siirsiimque curvato ; snperficie radiatim midti-costata, coslis in v. neur. ad 
apicem civciterlH, smpUcihus, deindo regione mediana dichotonm et laterallter multi- 
dlvisis, in v. liccm. costis prope apicem circiter 12, shnpUcibus, deinde mimerose 
divisis, et valde attenuatis, omninis minute granidosis et ad intermlla slriis incre- 
menti nonnidlis ahrupte inteesectis. 
I have only a single specimen of each valve to examine, hut both arc sufficient 
for tlie determination of this interesting species. It differs from nearly all known 
crctaccons forms hy the haiinal valve being considerably more convex than the 
neinal one, and hy the latter having its median anterior margin conspicuously pro- 
duced and turned upward. In the latter character the species approaches the Juras- 
sic 2\ substriata, Sehloth. 
The radiating ribs are more numerously divided, and consequently thinner, on 
the lipcmal than on the neural valve. 
LocaUty . — North-west of Coodycand (beds of Am. Eotomagensis and rostratusj, 
apparently rare, in a yellowish brown limestone. 
Formation . — Ootatoor group. 
IvIXGENA, Dav., 1852. 
Davidson, British Cret, Brach., p. 40. 
Shell incquivalve, subcircular, clongatcly suhpentagonal or ovate, with the 
surface more or less distinctly granular and pustulate ; ncinal valve generally Avith 
Avell developed uml)onal ridges, and a small deltidium in tAvo pieces, separated or 
touclung each other ; hoemal valve with a distinct septimi, and the reflected (neural) 
])ortion of the arms united and attached to, or iutcrscctcd hy, the septum ; muscitlar 
impressions similar to those of other Teeebratvliuje. lApe, Kingena lima, Defr., 
from cretaceous rocks. 
There are only a fcAV cretaceous and tertiary sjjecies referable to this genus, 
such as Tereb. tamarindus, Sowerhy, Kingena past tdosa, Eosq., K. Eaincourti, 
E. Desk, &c. 
Megerlea differs from Kingena hy the radiating striation or costulation of the 
shell, and hy the neural portion of the brachial system being attached to the sep- 
tum as AA'cll as to the hannal branches, and also hy having the lateral loops filled 
AA'ith shell substance, Avhich lattq^* character separates it from Knienia. 
1. Kixgexa GRAXULbERA, StoUczka, PI. VII, Pigs. 8 — 12. 
King, testa subpientagona sen elongate omta, antice et postice sensim producta, 
snperficie densissime cequaliter gramdata, raids modice conve.ds ; valra hcemali antice 
sensim depressa, postice uniforme subrotundata, septo lineari f partem longitudinis 
(Bquante ; val. neurali medio maxime elecata, lateraliter depressa ; nnibone calde 
