Title: A classification of fishes : including families and genera as far as known
Abstract: Including Families and Genera as Far as Known Class LEPTOCARDII (Myelozoa) Order AMPHIOXI (Cirrostomi) The Lancelets (or Leptocardii) are without doubt simplest in organiza¬ tion of all fish-like chordates or vertebrates.Apparently their lowly structure is primitive but the geological history of the group is unknown and likely to remain so, as these creatures possess no hard parts.Whether the lampreys on the one hand or the lower and not fish-like acranite Chordata (Tunic at es and Entcropneustans) are de¬ rived from Leptocardians can not be known.Family 1. AMPHIOXIDXDJE Amphioxides 1 Gill, 1895, 467.1 This genus of three species, based on the absence of buccal cirri, the unsymmetrical mouth, and some other anatomical details, is now regarded as probably a larval form of Asymmetron rather than as a distinct genus.Family 2. BKANCHIQSTOMIBJE (.Amphioxides) (Lancelets)