. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. elegans concolor complanata parasitica. Figure D. Diagram indicating relationships of tlie species described. clusters to the body, when such attachment exists, is imperfect and the arrangement of the clusters irregular. The European species complanata and concolor are very closely related to elegans, complanata certainly, perhaps also concolor, being intermediate between it and parasitica. In view of the many points of similarity between parasitica and com- planata, there seems to me to be insufficient groun
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. elegans concolor complanata parasitica. Figure D. Diagram indicating relationships of tlie species described. clusters to the body, when such attachment exists, is imperfect and the arrangement of the clusters irregular. The European species complanata and concolor are very closely related to elegans, complanata certainly, perhaps also concolor, being intermediate between it and parasitica. In view of the many points of similarity between parasitica and com- planata, there seems to me to be insufficient ground for placing them in distinct genera, as proposed by Blanchard. Allusion has already been made to the somewhat isolated position of heteroclita. In size and in the character of its integument, it resembles the stagnalis group, likewise in the number of its crop diverticula ; in regard to the lobed condition of its crop diverticula, it resembles the parasitica group. In the number of its eyes (three pairs), it likewise resembles the latter group, but the derivation of these apparently is from different somites ( in heteroclita, in parasitica and elegans.) As regards the position of the genital pores and the way the eggs are borne, it differs alike from both 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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