11)2 



ANNALS NEW YORK ACADEMY OF SCIENCES 



Spirifer mucronatus mut. thedfordense — Continued 



Adult Stage Neanic Stage 



Number Width Height Index Index Width Height 



(reverse) ( 



88 33 . 5mm. 26 . 5mm. .791 1 . 26 33 . 5mm. 20mm 



89 28 21.5 .767 1.30 28 17 



90 30 30 1.000 1.00 30 19 



91 34 25 .735 1.36 34 18 



92 39 27 .692 1.44 .39 19 



93 34 26 .764 1.30 34 19 



94 34 25 .735 1.36 34 19 



95 34 23 .676 1.47 34 14 



96 43 29 .674 1.48 43 19 



97 31 30 .967 1.03 31 18.5 



98 35 24 .685 1.45 35 17.5 



99 27 26.5 .981 1.01 27 19.5 



100 39.5 32.5 .822 1.21 32.5 19 



101-175 inclusive = Spirifer mucronatus mut. alpenense. 



213 33.5 32 .952 1.04 33.5 20 



214 27 25.5 .944 1.05 27 14 



215 32 .31 .968 1.03 32 19 



216 26 28 1.076 .928 26 18 



217 .30.5 28 .918 1.08 30.5 14 



218 33.5 32.5 .970 1.03 33.5 20 



219 26 26.5 1.019 .981 26 14.5 



220 35 33 .942 1.06 35 22.5 



221 27 27 1.000 1.000 27 18.5 



222 .31 29 .935 1.06 31 20 



223 26 25 .961 1.04 26 17.5 



224 28 26 .928 1.07 28 22.5 



225 29 26 .896 1.11 29 20 



226 32 31 .968 1.03 32 22 



227-445 inclusive = Spirifer mucronatus mut. alpenense. 



446 39.5 26.5 .670 1.49 39.5 17.5 



447 33 22 .666 1.50 33 14.5 



448 35 31 .885 1.12 .35 17 



449 36 25.5 .708 1.41 36 20 



450 .36 22.5 .625 1.60 36 16.5 



451 



452 33 23.5 .712 1.40 33 16 



453 37 28.5 .770 1.29 37 18.5 



454 30 24 .800 1.25 30 17.5 



455 34 27 .794 1.25 34 22 



456 36 27.5 .763 1.30 .36 20 



4.-7 32 22.5 .703 1.42 .32 14.5 



458 35 27 .771 1.29 35 19 



459 31 25 .806 1.24 .31 18.5 



460 45 .30 .666 1.50 45 21 



Index 



Index 



(reverse) 





.597 



1.67 



.607 



1.64 



.633 



1.52 



.529 



1.88 



.482 



2.05 



. 558 



1.78 



. 558 



1.78 



.411 



2.42 



.441 



2.26 



.596 



1.67 



.500 



2.00 



.722 



1.38 



.584 



1.71 



.597 



1.675 



.518 



1.92 



.593 



1.68 



.692 



1.44 



.459 



2.17 



.597 



1.675 



.557 



1.49 



.642 



1.55 



.685 



1.45 



.645 



1.55 



.673 



1.48 



.803 



1.24 



.689 



1.45 



.689 



1.45 



.443 



2.25 



.439 



2.27 



.485 



2.05 



.555 



1.80 



.458 



2.18 



.484 



2.06 



.500 



2.00 



.583 



1.71 



.647 



1.54 



.556 



1.80 



.453 



2.20 



.542 



1.84 



.596 



1.67 



.466 



2.14 



