Fishes . in color, with whitishspots, and reaches a length of 2^ feet. As a shallow-waterform, with certain differences in the claspers and in the tail,Chimara colliei is sometimes placed in a distinct genus, Hydro-lagus. Other species inhabit much greater depths and havethe tail produced into a long filament. Of these, Chimaramonstrosa, the sea-cat of the north Atlantic, has been longerknown than any other Chimcera. Chimara afflnis has beendredged in the Gulf Stream and off Portugal. Chimccra phan-tasma and Chimccra mitsukurii are frequently taken in Japan, 222 The Holocephali, or Chimeras an
Fishes . in color, with whitishspots, and reaches a length of 2^ feet. As a shallow-waterform, with certain differences in the claspers and in the tail,Chimara colliei is sometimes placed in a distinct genus, Hydro-lagus. Other species inhabit much greater depths and havethe tail produced into a long filament. Of these, Chimaramonstrosa, the sea-cat of the north Atlantic, has been longerknown than any other Chimcera. Chimara afflnis has beendredged in the Gulf Stream and off Portugal. Chimccra phan-tasma and Chimccra mitsukurii are frequently taken in Japan, 222 The Holocephali, or Chimeras and the huge jet-black Chimara piirpurascens in Hawaii andJapan. None of these species are valued as food, but all impressthe spectator with their curious forms. The fossil Chimccridcc, although numerous from Triassictimes and referred to several genera, are known chiefly by theirteeth with occasional fin-spines, frontal holders, or impressionsof parts of the skeleton. The earliest of chimaeroid remains has. Fic. —Elephant-fish, Chimara colliei Lay & Bennett. Monterey. been described by Dr. Charles D. Walcott * from Ordovicianor Lower Silurian rocks at Canon City, Colorado. Of the speciescalled Dictyorhabdus priscus, only parts supposed to be thesheath of the notochord have Ijeen preserved. Dr. Dean thinksthis more likely to be part of the axis of a cephalopod definitely known ChimtrridcB are mainly confined to therocks of the Mesozoic and subsequent eras. Ischyodiis priscus(avitus) of the lowev Jura resembles a modem oweni is another extinct chima^ra, and numerousfin-spines, teeth, and other fragments in the Cretaceous andEocene of America and Europe are referred to Edaphodon. Aspecies of Chimara has been recorded from the Pliocene ofTuscany, and one of Calorhynchiis from the greensand of NewZealand. Other American Cretaceous genera of chim;croids areMylognathiis, Bryactiniis, Isotccnia, Lcptomylns and plates called Rhynchodus
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