eas. each with three slender, curv- The term cestracion is from the Greek kestra, a ed, subconical cusps, separat- weapon. Many of the extinct species are known by ed by a pair of rudimentary the preservation of this spine, which being of more denticles or a broad base. durable structure is… … preys, sharks, and rays are recognized as differing the vulcanite emery wheel, prolongs the life of the TICHENOB & WALKEB'S IMFBOVED STUMP PULLEB. sufficiently from the true fishes to entitle them to wheel, is concededly safe with the vulcanite wheel. [for description see page 133.] Thus run, it is…
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