. Bulletin - United States National Museum. Science. Fig. 5.—Diagrams showing the modes of imbkication and the homologies of compartments in chthamalidie and ^. c, carina, cl, carinolateral compartment. i, lateral. t, rostrum, rl, ROSTROLATERAL. THE SECOND DIAGRAM REPRESENTS OCTOMERIS. views of tlie homologies of the compartments, so far as he definitely expressed himself, and is opposcnl to the interpretations of Gnn^el.^ The question of homologies of the wall plates is by no means aca- demic. Our conceptions of the classification and phylogeny of the group depend upon our understandi
. Bulletin - United States National Museum. Science. Fig. 5.—Diagrams showing the modes of imbkication and the homologies of compartments in chthamalidie and ^. c, carina, cl, carinolateral compartment. i, lateral. t, rostrum, rl, ROSTROLATERAL. THE SECOND DIAGRAM REPRESENTS OCTOMERIS. views of tlie homologies of the compartments, so far as he definitely expressed himself, and is opposcnl to the interpretations of Gnn^el.^ The question of homologies of the wall plates is by no means aca- demic. Our conceptions of the classification and phylogeny of the group depend upon our understanding of these homologies. The cirri are always well developed in sessile barnacles, and there is much less diversity in the arrangement of the spines than in the Lepadomorpha. The first two or three pairs of cirri bear dense, brusliliko tufts of spines; the later cirri bear spines in pairs, two to eight or ten pairs on each segment. The number of pairs of spines is a useful specific character, though subject to some variation in polymorphic species. In descriptions the comit is made in the median third of the cirrus, where the maximum immbcr is found. I Gravel, Monographie des CirrhipMes, p. 194, fig. 213, where Professor Gruvel's views of the homologies pf the compartments are 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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