880 Report or THE STATE GEOLOGIST. 
plates well developed. Pedicle-valve without dental plates. In 
the brachial valve is a conspicuous trilobed cardinal process and 
a hinge-plate supported by a median septum which may be more 
or less developed. Loop long, extending nearly to the anterior 
Fie. 556, Fic, 557. 
Fies 557, 558. Magellania flavescens. a, pedicle-valve; b, brachial valve; c, adductor scars; 
d, diductors; e, accessory diductors; p, ventral pedicle-muscle; v, median pedicle-muscle, . 
(@avipson.) » 
Fig. 559. Magellania flavescens, showing Fic. 560. The brachial supports of Magel- 
the brachia. (Davipson.) lania flavescens. CHANCOCK.) 
margins of the valves ; oral processes large, not united ; ascend- 
ing branches extending backward to or beyond the center of the 
shell and united by a stout transverse lamella. Muscular area 
posterior in both valves. 
1382 
