So JURASSIC .RHYNCHONELLIDS 
Pedicle valve. A pedicle collar is present ; the deltidial plates are conjunct and 
“crumple up’’ against one another. A quadrate delthyrial cavity is flanked by 
lic, 28. Transverse serial sections of Somalivhynchia africana Weir. Taken from Muir-Wood 
(1935, fig. 8, p. 95). 
