. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. VARIATION IN TOAD AND ISOPOD. 279 rudiment of the spleen instead of a single one, as is normally the case. Bearing this uncertainty in mind, we may provisionally include the present case in the lienes accessorii of Haberer. Case 7. Lìgia sp., S£. With a supernumerary thoracic segment. (Cut 8.) This isopod is a very common species found on our rocky coasts, and on the banks of estuaries and the canals that open into them. It is more nearly allied to L. italica than to L. oceanica, but I regret to say that, with the literature at my
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. VARIATION IN TOAD AND ISOPOD. 279 rudiment of the spleen instead of a single one, as is normally the case. Bearing this uncertainty in mind, we may provisionally include the present case in the lienes accessorii of Haberer. Case 7. Lìgia sp., S£. With a supernumerary thoracic segment. (Cut 8.) This isopod is a very common species found on our rocky coasts, and on the banks of estuaries and the canals that open into them. It is more nearly allied to L. italica than to L. oceanica, but I regret to say that, with the literature at my disposal I have not been able to identify it. The sexes can easily be distin- guished by the fact that in the male the last thoracic seg- ment bears, in the mesial portion on the ventral side, a pair of long, slender, needle-like processes pro- jecting backwards, and that the endopodite of the second abdo- minal segment is transformed into a long process resembling in shape the claspers of certain skates. As in all isopods, the body is normally made up of twenty segments, as counted by the num- ber of pairs of appendages, viz. six in the head, corresponding to the two pairs of antennae, one pair of mandibles, two pairs of maxillae, and one pair of maxillipedes, seven in the thorax, each bearing a pair of legs, and seven in the abdomen, or pleon, of which the last two are fused together and bear a pair of long bifid appendages, while the first five bear the ordinary spurious legs. As shown in the accompanying cut, the example before us has eight thoracic segments, but is normal in all other respects. The thoracic segments are so exactly like those of normal examples, that it is only by actual counting that one can make out that there is a. Cut Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nihon Do?bu
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
