. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. ON A NEW ICHTIIYOXENUS FROM LAKE BIWA. I27 Metasome segments slightly increase in length posteriorly, except the sixth or terminal segment which is very large, somewhat broader than long, nearly flat and half-moon-shaped.^ The first two metasome segments are visible in the middle parts only, the lateral parts being covered over by the last mesosome segment. Mandible (fig. 3) slender ; anterior end narrow and rounded, with a short claw-like process ; a comparatively large, internally directed process present near the end. A moderat
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. ON A NEW ICHTIIYOXENUS FROM LAKE BIWA. I27 Metasome segments slightly increase in length posteriorly, except the sixth or terminal segment which is very large, somewhat broader than long, nearly flat and half-moon-shaped.^ The first two metasome segments are visible in the middle parts only, the lateral parts being covered over by the last mesosome segment. Mandible (fig. 3) slender ; anterior end narrow and rounded, with a short claw-like process ; a comparatively large, internally directed process present near the end. A moderately large, 3-jointed palp on the outer side ; proximal joint the largest, distal joint the smallest. The palp bears no hair, but shows a few (2 or 3) very minute processes, probably of sensory nature, at the free end. In both sexes, tips of palps visible from the dorsal side. Maxillula (fig. 4) very simple, rod-like, distally slightly tapering, the tip provided with four claw-like processes, of which the largest is conspicuous on account of its brownish colour. Maxilla (fig. 5) finger-like, much stouter than maxillula, with minute subterminal seg- ment. Tip of maxilla bears a few (4 or 5) recurved hooks. Maxilliped (fig. 6) also simple, consisting mainly of two joints, of which the proximal about twice as large as the distal. Dorsally, to tip of the latter, is attached a rudimentary joint, bearing at its inner end three or four conspicuous recurved hooks. No endite pre- sent on the proximal joint. Thoracic legs divisible into anterior and posterior groups, the former consisting of three leg pairs and the latter of four pairs. In the anterior. Fig. 3, Mandible, p palp. Fig. 4, Maxillula. Fig. 5, Maxilla. Fig. 6, Maxilliped. All from Jj>. Magri, about 24X 1) In Ichthyoxemts japcuevsis, the terminal segment is usually a little longer than broad, and more or less cup-like, the free margin being distinctly curved Please note that these images are extracted from scanne
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
