ORDOVICIAN BRACHIOPODA 



137 



Table 98 



Statistics of length (1) and maximum width (w) of n brachial valves of S. antiqua Jones from the 



Ffairfach Group (A), S. cf. antiqua from the Meadowtown Beds (B), S. multiseptata sp. nov. from 



the Spy Wood Grit (C) and S. cf . sericea permixta Williams from the Aldress Shales (D) 





A 



B 



C 



D 



n 



44 



3i 



10 



20 



1 mm 



377 



2-66 



2-27 



3-94 



(var 1) 



(o-8 5 i) 



(0-508) 



(o-333) 



(3-096) 



w mm 



7'45 



5-36 



4-42 



7-83 



(var w) 



(3-°39) 



(2-112) 



(0-971) 



(12-016) 



r 



0-956 



0-989 



0-987 



o-995 



logel 



1-2988 



0-9427 



0-7885 



1-2817 



(var logel) 



(0-0579) 



(0-0695) 



(0-0626) 



(0-1815) 



logeW 



1-9816 



I-6437 



1-462 



1-9685 



(var log e w) 



(0-0532) 



(0-0708) 



(0-0484) 



(0-1789) 



r e 



0-964 



o-995 



0-992 



0996 



a 



0-9582 



1-0094 



0-8795 



0-9928 



(var a) 



(0-00153) 



(0-00036) 



(0-00161) 



(0-00046) 



Table 99 



Statistics of length (1) and maximum depth (th) of n pedicle valves of 5. cf. antiqua from the 

 Meadowtown Beds (B) and S. cf. sericea permixta Williams from the Aldress Shales (D) 



(see Table 98) 



B D 



n 10 9 



3-28 (0-491) 5-n (3-I94) 



0-49 (0-023) 0-97 (0-232) 



0-883 0795 



1 mm (var 1) 

 th mm (var th) 



r 

 a (var a) 



0-2175 (0-0013) 0-2698 (0-00381) 



Table ioo 



Statistics of length of pedicle valve (1) and length of ventral muscle scar (sc) in n examples of S. 

 antiqua Jones from the Ffairfach Group (A), 5. cf. antiqua from the Meadowtown Beds (B), S. 

 multiseptata sp. nov. from the Spy Wood Grit (C) and S. cf. sericea permixta Williams from the 



Aldress Shales (D) 





A 



B 



C 



D 



n 



37 



20 



15 



21 



1 mm 



4-71 



3-24 



3H5 



5-2 



(var 1) 



(0-831) 



(0-869) 



(0-941) 



(3-ioi) 



sc mm 



1-5 



0-85 



1-09 



2-2 



(var sc) 



(0-157) 



(0-119) 



(0-146) 



(I-I09) 



r 



0-885 



o-947 



0-967 



o-953 



logel 



1-532 



I-I359 



I-20I 



1-5954 



(var logel) 



(0-0367) 



(0-0794) 



(0-076) 



(0-1083) 



log e SC 



0-3697 



-0-239 



0-0316 



0-6878 



(var logeSc) 



(0-0675) 



(o-i53) 



(0-H53) 



(0-2055) 



r e 



0-898 



o-954 



0-969 



0-9611 



a 



1-3567 



1-3878 



I-23I7 



1-3776 



(var a) 



(0-01014) 



(0-00959) 



(0-007I2) 



(0-00761) 



