. . atonce dispose of the Eurypteridae and the Xiphosuridae. SECT, xv CLASSIFICATION OF CRUSTACKA 255 From the Trilobitcs, however, we arc inclined todeduce at least a part of one important group ofmodern Crustacea, the Ostracoda. \Yc think it Limiting Ostracoda Cirripedia Copepoda si pus Phylopoda Malactistraca Crustacean -Inn el id. Ceratiocaris Hy rnenocarisadult EnrypUridtz Jfl Pruposecl genealogy of ihe Crustacea. It will be seen from the text that though wehave here given only one root for the Ostracoda it is probable that they
. . atonce dispose of the Eurypteridae and the Xiphosuridae. SECT, xv CLASSIFICATION OF CRUSTACKA 255 From the Trilobitcs, however, we arc inclined todeduce at least a part of one important group ofmodern Crustacea, the Ostracoda. \Yc think it Limiting Ostracoda Cirripedia Copepoda si pus Phylopoda Malactistraca Crustacean -Inn el id. Ceratiocaris Hy rnenocarisadult EnrypUridtz Jfl Pruposecl genealogy of ihe Crustacea. It will be seen from the text that though wehave here given only one root for the Ostracoda it is probable that they havehad at least a twofold origin. probable that the Crustaceans in question may bededuced both from Trilobitcs and Phyllopods. Thestrong likeness between these early forms, especially intheir larval stages, now perpetuated in the Ostracoda, 256 THE APODID^E PART n accounts for the general resemblance of the latter toone another. THE OSTRACODA. These animals occur in company with the Trilobitesin the very oldest fossiliferous strata. Balfour sug-gested that they may have had an origin independentof that of the other Crustacea. As, however, we findthem possessing the bent intestine, clear traces of theentosternite, the paired and the unpaired eye, wemust, according to our theory, deduce them from ourbent Annelid. There are two ways in which the origin of thebivalve shell may be explaine
Size: 1487px × 1680px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherlondo, bookyear1892
