This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...the end of the caudal rami. In structure, they exactly agree with those in the preceding species. The posterior antennae (fig. 6) likewise resemble those in P. major, except that the 2nd joint of the outer ramus has only a single seta at the end, whereas in the 2 other species this joint carries 4 setae. The mandibles ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...the end of the caudal rami. In structure, they exactly agree with those in the preceding species. The posterior antennae (fig. 6) likewise resemble those in P. major, except that the 2nd joint of the outer ramus has only a single seta at the end, whereas in the 2 other species this joint carries 4 setae. The mandibles (fig. 7), maxillae (fig. 8), and anterior maxillipeds (fig. 9) do not exhibit any essential difference from those appendages in the other 2 species. The posterior maxillipeds (fig. 10), on the other hand, are rather more produced, and have the terminal part comparatively longer, and more generally reflexed. The natatory legs (figs. 11--13), on the whole, agree in structure with those in the 2 preceding species, though some minor differences may be found to exist. Thus in the 1st pair (fig. 11), the 1st joint of the outer ramus is without the usual spine outside, and the inner ramus has only 4, instead of 5 natatory setae. In the 3 other pairs (figs. 12--14) the apical spine of the outer ramus is exceedingly long and slender, being much longer than the terminal joint, and in the 4th pair (fig. 13) almost as long as the whole ramus. As in the other species of this genus, no trace of any 5th pair is present in the female. Occurrence. This small Calanoid occurred in considerable numbers in the samples taken north of the New Siberian Islands, in October, 1893; no male specimen, however, was found. Gen. Spinocalanus, Giesbrecht. Remarks. This genus was established by Dr. Giesbrecht, to include a small Calanoid found in the tropical part of the Pacific Ocean, at a very considerable depth (1000--4000 metres), for which reason the species was named S. dbyssalis. As the specimens were in a somewhat imperfect state of preservation, only some few detail-f...
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