BRAcHIOPODA. 891 
median septum a short distance above the insertion of the 
descending branches. 
Type, Magasella Adamsi, Davidson (sp.). 
Fias. 609, 610. Magasella Adamsi, Davidson (sp.). (WooDwWARD.) 
Distribution. Recent (Australo-Zealandian, Japanese, Aleutian 
and Magellanian Provinces.) 
Muhlfeldtia, Bayle. 180. 
Synonym; Megerlia, King, 1850. 
Shells transverse or elongate, the transverse forms having a 
straight hinge-line and a well-developed cardinal area on each 
valve. Beaks low, foramen large, deltidial plates incomplete. 
Surface radiate. Cardinal process large. In the loop the 
descending processes unite anteriorly with the ascending 
branches, the latter being joined at their base to the median 
Fias. 611-618. Muhifeldtia truncata, Linné (sp.). (DAvipson.) 
septum, whence they bend forward and recurve. The lateral 
or basal portions of the ring thus formed are expanded and, in 
final stages of development, broadly perforated. Internal surface 
of the valves covered with radiating rows of pustules. 
Type, Mihlfeldtia truncata, Linné (sp.). 
Distribution. Tertiary — Recent (Lusitanian, West African, 
Indo-Pacific, Australo-Zealandian and Japanese Provinces.) 
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