4 o SHELVE DISTRICT 



Table 23 



Statistics of valve length (1) and length of the entire muscle fields (Is) in 12 brachial valves of 



Monobolina plumbea (Salter) 



1 mm (var 1) 12-89 (4"979) 



Is mm (var Is) 6-69 (2-343) 



r 0-943 



logel ( var log e l) 2-5419 (0-0296) 



logels (var logels) 1-8754 (0-0510) 



r e 0943 



a (var a) 1-3126 (0-0189) 



Table 24 



Statistics of length (1) and thickness (th) of 12 pedicle valves of Monobolina plumbea (Salter) 



1 mm (var 1) 8-27 (17-045) 



£R mm (var th) i-o (0-306) 



r 0-95 



logel (var logel) 2-001 (0-2228) 

 logeth (var logeth) —0-015(0-0301) 



r e 0-972 



a (var a) 0-3676 (0-00075) 



Table 25 



Statistics of valve length (1) and muscle platform length (sc) of 13 pedicle valves of Monobolina 



plumbea (Salter) 



1 mm (var 1) 12-74 ( I2- 778) 

 sc mm (var sc) 5-88 (3-235) 



r 0-983 



a (var a) 0-5032 (0.00079) 



Table 26 



Statistics of valve length (1) and pedicle groove length (pe) of 13 pedicle valves of Monobolina 



plumbea (Salter) 



1 mm (var 1) 12-74 ( I2 '778) 

 pe mm (var pe) 1-42 (0-288) 



r 0-903 



a (var a) 0-1502 (0-00035) 



Family PATERULIDAE Cooper 1956 



PATERULA Barrande 1879 



Paterula cf. bohemica Barrande 

 (PI. 6, figs. 2-11) 

 1879 Paterula bohemica Barrande : plate 152. 



Diagnosis. Elongately oval Paterula with a brachial valve 87% as wide as long 

 and 17% as deep as long ; ventral beak submarginal, dorsal beak submarginal, 



