A treatise on zoology . of the stratain which the Cladoselachii occur, theirgeneral proportions and simplicity ofstructure, their dentition, amphistylicjaAvs, and paired fins, all favour the vieAvthat they are primitive. The stronglyheterocercal tail, and the circumorbital. Fig. 10-1. Cladosdache Fi/Ir ri, . fln. (After Dean, fromA. S. AVoodward.) D, tin-mem-brane with dermal rays; N, neuralspines; R, endoskeletaliradials. .<

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology