56 shelve district 



Table 32 



Statistics of length (1) and depth (th) of n pedicle valves of Orthambonites exopunctata sp. nov. (A) 



and Lenorthis cf . proava (Salter) (B) 





A 



B 



n 



24 



17 



1 mm (var 1) 



7-4 (5-892) 



5-51 (3-441) 



tn mm (var th) 



2-31 (0-674) 



1-72 (0-2106) 



r 



0-919 



0-578 



a (var a) 



0-338 (0-0008) 



0-247 (0-00272) 



Table 33 



Statistics of length of pedicle valve (1) and length of ventral muscle scar (sc) for n specimens of 

 Orthambonites exopunctata sp. nov. (A) and Lenorthis cf. proava (Salter) (B) 



A B 



n 22 16 



1 mm (var 1) 7-79 (5-934) 57 1 (2-133) 



s"c mm (var sc) 2-77 (0-942) i-8i (0-343) 



r 0939 0-906 



a (var a) 0-399 (0-00094) 0-401 (0-00205) 



Table 34 



Statistics of length (1) and maximum width (w) of the ventral muscle scar of n specimens of 

 Orthambonites exopunctata sp. nov. (A) and of Lenorthis cf. proava (Salter) (B) 





A 



B 



n 



18 



14 



1 mm (var 1) 



2-8i (0-789) 



1-78 (0-299) 



w mm (var w) 



2-36 (0-426) 



1-7 (0-174) 



r 



0-912 



0-895 



a (var a) 



0735 (0-00569) 



0-763 (0-00966) 



Table 35 



Statistics of length of pedicle valve (1) and length of dental plates (dl) for n specimens of Ortham- 

 bonites exopunctata sp. nov. (A) and of Lenorthis cf. proava (Salter) (B) 



A B 



n 21 16 



1 mm (var 1) 7-23 (6-153) 5-75 (2-172) 



dl mm (var dl) i-68 (0-357) °'9% (°' I 37) 



r 0-923 0-895 



log e l (var log e l) 1-996 (0-098) 1-717 (0-0636) 



logedl (var log e dl) 0-46(0-1188) —0-66(0-1334) 



r e 0-926 0-903 



a (var a) 1-101(0-0091) 1-448(0-0275) 



