. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. JACKSON: STATUS OF BOTHRIOCIDARIS 493 compared with that of all known Echini is strongest evidence of im- mediate kinship. The radial position of the supposed teeth of Bothriocidaris has been a real stumbling block. Dr. Mortensen's observations help this diffi- culty by seeming to show that they are not teeth at all. As he notes. Fig. 9.— Arbacia punciulatn (ham.). Woods Hole, Mass. X 4. Variant. Interambulacrum 3 reduced to single column for last three plates built, genital 3 of peculiar shape and im- perforate. Comp
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. JACKSON: STATUS OF BOTHRIOCIDARIS 493 compared with that of all known Echini is strongest evidence of im- mediate kinship. The radial position of the supposed teeth of Bothriocidaris has been a real stumbling block. Dr. Mortensen's observations help this diffi- culty by seeming to show that they are not teeth at all. As he notes. Fig. 9.— Arbacia punciulatn (ham.). Woods Hole, Mass. X 4. Variant. Interambulacrum 3 reduced to single column for last three plates built, genital 3 of peculiar shape and im- perforate. Compare fig. 8. (After Jackson, 1927, fig. 40.) (p. 102, 109): "There is an indication of tubercles on them, decidedly no ; Again, in the examination of another specimen from the Reval Museum, Dr. Mortensen says of the "teeth" (p. 121), "It is perfectly evident in this specimen that these plates are of the same nature as the other coronal plates, absolutely not coming from the in- terior of the ; With all the evidence it seems that these supposed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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