. The Cambridge natural history. Zoology. ANOMURA—GALATHEIDEA 169 Galathm, are littoral auinials, and may be found hiding under stones and in crevices on the shore; but a number occur in deep water, Munida and Munidopsis. The shallow-water species have ordin- arily developed eyes; the various species of Munida, which occur in fairly deep but by no means abyssal regions, have usually very large and highly pigmented eyes; while in Munidopsis, which is characteristic of very deep water, the eyes are degenerate and colourless, as shown in Fig. 114. The Zoaeae, or young larval stages of the Ga
. The Cambridge natural history. Zoology. ANOMURA—GALATHEIDEA 169 Galathm, are littoral auinials, and may be found hiding under stones and in crevices on the shore; but a number occur in deep water, Munida and Munidopsis. The shallow-water species have ordin- arily developed eyes; the various species of Munida, which occur in fairly deep but by no means abyssal regions, have usually very large and highly pigmented eyes; while in Munidopsis, which is characteristic of very deep water, the eyes are degenerate and colourless, as shown in Fig. 114. The Zoaeae, or young larval stages of the Galatheidea, are characterised by the immense length of the spines upon the carapace (Fig. 115). The young Zoaea which hatches out from the egg resembles in other respects that of tlie Brachyura. The Metazoaea, however, differs from that of the Brachyura in the fact that the third maxillipede is first present as a biramous swimming organ, and at its first appear- ance is not developed in its definitive form. The other thoracic limbs are not schizo- podous wlien they appear, and indeed in nearly all respects the development proceeds as in the Bracln'ura. Fam. 1. Aeg-leidae.—The gills are tri- chobranchiae, and there are eight arthro- branclis. There are no limbs on the second alidominal segment of the male. The al)domen is not carried folded on to the thorax. The first tw(^ cliaracteristics family from all tlie other Ae(jh(i, Ificvis, a fresh-water the rivers of temperate S. America, is the sole representative. Fam. 2. Galatheidae.—The abdomen is not folded against the thorax. The mem- bers of this family are often littoral in separate tliis Galatheidea. species fiom. Fig. ] ] 5. — Zoaea of PoiccUana, x 20. T, Telsoii. (After Clans.). 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 Harmer, S. F. (Sidney
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Keywords: ., bookauthorsh, bookcentury1800, bookdecade1890, booksubjectzoology
