Bracuiopopa. 873 
= 
of pedicle-valve without dental plates. In the brachial valve 
the cardinal process is slightly developed; hinge-plate and 
median septum wanting; socket walls prominent, supporting a 
short loop which is rendered annular by the union of the oval 
processes. 
Brachia as in Liornyrina, the median unpaired arm being 
small. Each lobe of the mantle bears four sinuses; genital 
Fias. 518-522. Terebratulina caput-serpentis, Linné (sp.). (DAvipson; BARRETT.) 
glands six, two in each mantle lobe and two in the visceral 
cavity. 
‘Type, Terebratulina caput-serpentis, Linné (sp.). 
Distribution. Jurassic— Recent (Arctic, Boreal, Lusitanian, 
West African, Indo-Pacific, Australo—Zealandian, Japanese, 
Aleutian, Californian, Magellanian, Caribbean and Transatlantic 
Provinces). 
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