. Bulletin - United States National Museum. Science. 130 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. and intelligibly explained that can not be explained in any other way. No one of the comparisons is in itself at all conclusive, while in one or two cases a comparison between the ecliinoderms and tlie annelids is almost as justifiable as between the echinodeims and crustaceans; but the sum total of the comparisons indicates that. Fio. 77.—Dorsal view or a spectmen of Comatulella BRAcraoLATA from Austraua, showing tue relative propor- tions OF the arms, hnmtles, centrouorsai. and cirri (reconst
. Bulletin - United States National Museum. Science. 130 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. and intelligibly explained that can not be explained in any other way. No one of the comparisons is in itself at all conclusive, while in one or two cases a comparison between the ecliinoderms and tlie annelids is almost as justifiable as between the echinodeims and crustaceans; but the sum total of the comparisons indicates that. Fio. 77.—Dorsal view or a spectmen of Comatulella BRAcraoLATA from Austraua, showing tue relative propor- tions OF the arms, hnmtles, centrouorsai. and cirri (reconstructed from the type-speciiiens of Alecto rosea J. UOller). there is between the ecliinoderms and the crustaceans a similarity of fundamental structure which can not but ho more than accidental. At first sight it may seem unwarranted to suggest, even remotely, a comparison between such highly diverse and relatively recent animals as the echinoderms and the crabs of the present day. Yet in the two groups we have to do with types which are in a way convergent. Both the echiiiotierms aiul the crabs are ultimately. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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