. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. OX THE APPENDICES GENITALIAS ) IN THE SELACHIANS. 45 The peculiar mixture of Shark-like and Ray-like characters that, as it is well known, is found in RAina, is accordingly increased by several features in the appendages of the male, which features by the ventral covering piece and the pocket, situated below it, with entrance from a side-slit, and partly also by the glandular bag, recall those in the Rays (Torpedo, Narcine, Rliiiwbatns and Trygon\ while most of the other features are those common in other Sharks. C
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. OX THE APPENDICES GENITALIAS ) IN THE SELACHIANS. 45 The peculiar mixture of Shark-like and Ray-like characters that, as it is well known, is found in RAina, is accordingly increased by several features in the appendages of the male, which features by the ventral covering piece and the pocket, situated below it, with entrance from a side-slit, and partly also by the glandular bag, recall those in the Rays (Torpedo, Narcine, Rliiiwbatns and Trygon\ while most of the other features are those common in other Sharks. Cestraciontidce. Heterodontus (Cestracion) Phillipi (Cuv.). The skeleton has been described by Gegenbaur1;. Between the basale and the appen- dix are found two pieces (bt, b2 = /?, /?', fig. 18, io| that bear no rays; the piece fj is well developed (1. c. b fig. 19). The chief piece of the appendix is provided with two (rather long?) marginal cartilages (the boundary lines of which cannot be seen in the figures of Gegenbaur, as he has not understood the marginal cartilages to be particular pieces), of which the ventral one has a dorsally bent plate ( fig. 19, a); the stem is prolonged into a long style reaching almost to the end of the ter- minal part (1. c. fig. 19, 20, /). The number of terminal pieces is four: Td {^=\. c. fig. 19, 20, 0), Td2 (= 1. c. u), which, as is often the case, is prox- imally prolonged into the appendix-slit; Tv (= c), as commonly, stronger and thicker than the others, and finally T, forming a short thorn. Gegenbaur has correctly seen the homologies of these pieces with those in Acanthias, where, however, he has not seen the piece Td2 (= u in Heterodontus). Of these terminal pieces the piece T, is said (1. c. S. 452) to be hard, while the others, though fully developed, are still RJ Rv(a) (Z~ (u)Tdi Td (»J -R11 ill -Tv -Tvle) (o)rd--M : 0 Fig. 15. Heterodontus Phillipi. The skeleton of the right appendage. After Gegenbaur
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectscientificexpedition
