A treatise on zoology . Fig. 10-1. Cladosdache Fi/Ir ri, . fln. (After Dean, fromA. S. AVoodward.) D, tin-mem-brane with dermal rays; N, neuralspines; R, endoskeletaliradials. .<. Cladoselach: Fi/kri, Xewb. Left pectoral and pehic lins. (After Dean, from A. S. AVood-ward.) B, basal cartilages within the body-wall ; D. dermal lin-membrane with dermal rays ;•R, endoskeletal radials. CLADOSELA CHI I 187 ring, are the only clearly specialised characters they possess; andin these they approach the Acanthodii. Another point of resem-blance is the manner in which the paired fins merge
A treatise on zoology . Fig. 10-1. Cladosdache Fi/Ir ri, . fln. (After Dean, fromA. S. AVoodward.) D, tin-mem-brane with dermal rays; N, neuralspines; R, endoskeletaliradials. .<. Cladoselach: Fi/kri, Xewb. Left pectoral and pehic lins. (After Dean, from A. S. AVood-ward.) B, basal cartilages within the body-wall ; D. dermal lin-membrane with dermal rays ;•R, endoskeletal radials. CLADOSELA CHI I 187 ring, are the only clearly specialised characters they possess; andin these they approach the Acanthodii. Another point of resem-blance is the manner in which the paired fins merge posteriorlyinto the body-Avall. Important differences, however, separate thesetwo sub-classes. Family Cladoselachidae. Cladoselache, Dean ; Cleveland Sluile(Upper Devonian or Lower Carboniferous). Sub-Class 4. ACANTHODII. Among the earliest knoAvn fossil Vertebrata are certain spinyfish, which are generally associated with the Elasmobranchii.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
