. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 36 ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. AI. compressor. The bag-formed part of this muscle is rather long, and reaches considerably forward of the pelvis. On the contrary, the part forming the < outer lip-muscle is rather small (smaller than in m\- figures); as usual it originates from the stem-skeleton [[i) and from the hindmost rays, and is inserted on the proximal edge of the ventral marginal cartilage; it will here scarcely be able directly to contract the dilat
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 36 ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. AI. compressor. The bag-formed part of this muscle is rather long, and reaches considerably forward of the pelvis. On the contrary, the part forming the < outer lip-muscle is rather small (smaller than in m\- figures); as usual it originates from the stem-skeleton [[i) and from the hindmost rays, and is inserted on the proximal edge of the ventral marginal cartilage; it will here scarcely be able directly to contract the dilated terminal part').. Pristiurus melanostomus (Bonap.). (PI. II, fig. 20, 21.) The ventrals of the male of this species are also dorsally coalesced in a similar manner as in the preceding two vScylliidce^), but to a still less extent than in Sc. stellare., and a deep curve separates the coalesced part into two fin-laps. The appendices reach far behind the fin- membrane s), in a .specimen of the length of 78"^™ to 23""" behind the point of tlie fin-membrane; the whole length, from the hindmost edge of the cloaca, is 50'"™; the part quite free of the fin is 35'"'" long; the largest breadth of the organ is about j™'"; the terminal part has a length of about 25'""'. The ventral side is covered with dermal teeth, except the hindmost, soft, as it were, convoluted part (abt. 9""" long), on which still scattered groups of teeth may be seen; tlie dorsal side is naked, as are also the adjoining parts of the medial side, where they are covered by the fin- membrane; on the free edge of the lip / a few scattered rows of dermal teeth are seen. The dermal teeth are generally very fine; as in the fore- going species their points are on the terminal part turned towards the base of the aiDpendix. The dentition on the coalesced fin-parts is as in Sc. stellarc. The peculiar appearance of the will be seen with sufficien
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
