. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 312 DISTRIBUTION AND ETIOLOGY OF THE CRAYFISHES sternum is elevated into a transverse prominence, on the posterior face of which there is a pit or depression.* In hoth these characters, but more especially in the former, the Amurland and Japanese Astaci depart from both the Pontocaspian and the West American Astaci, and approach the Camhari of Eastern North America. In these crayfishes, in fact, one or both of the same pairs of legs in the male are provided with similar pd6
. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 312 DISTRIBUTION AND ETIOLOGY OF THE CRAYFISHES sternum is elevated into a transverse prominence, on the posterior face of which there is a pit or depression.* In hoth these characters, but more especially in the former, the Amurland and Japanese Astaci depart from both the Pontocaspian and the West American Astaci, and approach the Camhari of Eastern North America. In these crayfishes, in fact, one or both of the same pairs of legs in the male are provided with similar pd6_| Fig. 78.—Camiariis (Guatemala) penuliiuiate leg. cxp, coxopodite ; , coxopoditio setEB ; pdb, podobranchia; ip, basipodifce ; rp, ischiopo- dite; tiij), meropodite ; ej> carpopodite; pp. propodite j dp, daotylopodite. hook-like processes; while, in the females, the modifi- cation of the penultimate thoracic sternum is carried still further and gives rise to the curious structure de- scribed by Dr. Hagen as the " annulus ; In all the Camhari, the pleurobranchise appear to be entirely suppressed, and the hindermost podobranchia has no lamina ; while the areola is usually extremely narrow. The proportional size of the areola in the Amurland * Kessler, 1. 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 Huxley, Thomas Henry, 1825-1895; Huxley, Thomas Henry, 1825-1895. Crayfish. New York : D. Appleton
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
