BRAcHIOPODA. 893 
Bouchardia, Davidson. 1849. 
Synonym; Pachyhrynchus, King, 1850. 
Shells elongate-oval; surface smooth. Beak of the pedicle- 
- valve elevated, subacute, truncated by a circular foramen. LDel- 
tidial plates coalesced, concave. Interiorly both valves much 
thickened in the umbonal region. Teeth and sockets much 
abbreviated. In the pedicle-valve the adductor and diductor 
scars are situated anteriorly and divided by alow median ridge. 
Fias, 620-622, Bouchardia rosea, Mawe{(sp.). (Davipson.) 
In the brachial valve is an elongate rectangular, bilobed cardinal 
process, which fits into the deep pedicle-groove of the opposite 
valve. Median septum developed anteriorly. Brachidium with- 
out the descending branches; ascending branches represented by 
two broad, curved triangular processes coalesced with the sep- 
tum below and not uniting above. 
Type, Bouchardia rosea, Mawe (sp.). 
Distribution. Recent (Caribbean Province). 
Magas, Sowerby. 1816. 
Shells small, subplano-convex. Surface smooth. Pedicle- 
valve deep, with incurved umbo. Foramen subtriangular, del- 
tidial plates feebly developed. Brachial valve with a well- 
developed cardinal process, and very prominent median septum. 
Descending branches of the loop joined to the walls of this sep- 
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