JURASSIC RHYNCHONELLIDS 
Pa roe 
a NS 
WY ~ 
iy \ 
y f ae “a 
NS / 
% rs 
\; 
mw a 
reg Le 
Si Ce, | 
Fic. 24. Transverse serial sections of A. (Acanthorhynchia) panacanthina (Buckman & 
Walker). Topotype. Bajocian. Burton Bradstock, Dorset. Specimen donated by the 
B.M.(N.H.). (x4). 
