. Bulletin - United States National Museum. 1, Valve of large, involute, tridentate pedicellaria of Araeosoma coriaceum (A. Agassiz). X 27. 2, Valve of large, involute, tridentate pedicellaria of Araeosoma owstoni var. nudum Mor- tensen. Hybrid (?). X 33. 3, Large, involute, tridentate pedicellaria of Araeosoma owstoni var. nudum Mortensen Hybrid (?). X 17. REPORT ON THE ECHINOIDEA MORTENSEN 21 involute form of tridentate pedicellariae (pi. 1, figs. 2, 3) so closelyresembling that of A. coriaceum that one might be inclined to thinkthis specimen rather to be referable to the latter species. As
. Bulletin - United States National Museum. 1, Valve of large, involute, tridentate pedicellaria of Araeosoma coriaceum (A. Agassiz). X 27. 2, Valve of large, involute, tridentate pedicellaria of Araeosoma owstoni var. nudum Mor- tensen. Hybrid (?). X 33. 3, Large, involute, tridentate pedicellaria of Araeosoma owstoni var. nudum Mortensen Hybrid (?). X 17. REPORT ON THE ECHINOIDEA MORTENSEN 21 involute form of tridentate pedicellariae (pi. 1, figs. 2, 3) so closelyresembling that of A. coriaceum that one might be inclined to thinkthis specimen rather to be referable to the latter species. As a mat-ter of fact, I believe this specimen to be a hybrid between A. coriaceumand A. owstoni var. nudum. Since the two forms evidently occur inthe same area (the China Sea) there is so far nothing to prevent themfrom forming hybrids. The unfortunate fact that there are nodactylous pedicellariae to be found in the specimen under considera-tion prevents reaching a definite conclusion. The dactylous pedicel-lariae of A. owstoni and A. coriace
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
