. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 52 ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. more, and that the M. extensor is single. The glandular body is prolonged into the shaft quite as in Torpedo. Rhinobatidce. Rhinobatus columnae Bonap. (PI. Ill, fig. 35-370 In a specimen of the total length of 85,5™ and a breadth of 26™ across the pectorals the appendix had a length of n,5cm. The other measures were: from the fore end of the slit to the hindmost point of the appendix 7Acm the part free of the fin 6,2cm Length of the terminal part i,9cm Breadth - -
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 52 ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. more, and that the M. extensor is single. The glandular body is prolonged into the shaft quite as in Torpedo. Rhinobatidce. Rhinobatus columnae Bonap. (PI. Ill, fig. 35-370 In a specimen of the total length of 85,5™ and a breadth of 26™ across the pectorals the appendix had a length of n,5cm. The other measures were: from the fore end of the slit to the hindmost point of the appendix 7Acm the part free of the fin 6,2cm Length of the terminal part i,9cm Breadth - - - o,8cm The appendix reminds of that in Torpedo, being flat, and having (on the ventral side) the terminal part marked off by a slight constriction; but it is considerably longer, with a long free portion, and a relatively short terminal part, and so it has a rather slender, elegant appearance. The ventral side is all covered with the same dense mosaic of fine, flat' dermal teeth as the other parts of the belly; only the very outmost point (imm) is naked and soft. On the dorsal side the region around the fore- most part of the appendix-slit is naked as well as the whole part before the slit, which is normally in contact with the belly, this having also a corresponding naked spot; furthermore the naked part stretches as a small stripe backward close to the medial edge until the terminal part, the dorsal side of which is quite naked; otherwise the dorsal side is co- vered with teeth, and has the darker colour of the back of the animal. The appendix-slit is situated quite close to the lateral edge, only in the terminal part it bends towards the middle. On the dorsal side of the terminal part are seen two leading into pockets, quite corresponding to those in Torpedo and Nardile; the medial one is the longer; in the lateral one the outermost part of the piece T, is seen freely protruding from the skin as a shining thorn. The skeleton. Between the basale and the appendix-slit are
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectscientificexpedition
