THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 139 



Dimensions: The length of the aperture varies between 1.5 and 

 2.5 mm; its width between 0.3 and 0.6 mm. The maximum length of 

 the burrow varies between 2.2 and 3.6 mm and the \vidth between 

 1.0 and 1.8 mm. The aperture, nicely comma shaped, is in dimension 

 slightly larger to those of the three other forms studied here; the 

 burrows are relatively deep. 



Genus Rogerella Saint-Seine, 1951, page 1051 



Diagnosis: Fossil acrothoracican burrows with peduncular slit 

 and marginal flange. 



Type-species: Rogerella lecointrei Saint-Seine, 1951, page 1051. 



Rogerella lecointrei Saint-Seine, 1951, page 1051 



Figure 39 



Diagnosis: Fossil acrothoracican burrows with aperture in two 

 parts, with the narrow attachment end sometimes strongly deflected 

 to form a variable angle. 



Distribution: In the Santonien (Upper Cretaceous) of Champagne 

 and Bourgogne, in Micraster and Echinocorys, Rare. 



p 



327-241 O - fis - in 



