. The Cambridge natural history. Zoology. OXYSTOMATA RESPIRATORY MECHANISMS I 87 the chelipedes properly in position. Tlie inhalant openings are situ- ated just in front of the chelipedes. It is a most remarkable fact that among the Cyelometopa, Lupa /i,astota(rig. 131)has an exactly similar arrangement. Apparently we have here another instance. FiH. 129.—Dorsal view of iliatete SaKfeii, x 1. (From an original drawing prepared for Professor Weldon.) of convergence, similar to that of Corystes and Albunea, but the case is complicated by the fact that some of the Oxystomata, and among them Matut
. The Cambridge natural history. Zoology. OXYSTOMATA RESPIRATORY MECHANISMS I 87 the chelipedes properly in position. Tlie inhalant openings are situ- ated just in front of the chelipedes. It is a most remarkable fact that among the Cyelometopa, Lupa /i,astota(rig. 131)has an exactly similar arrangement. Apparently we have here another instance. FiH. 129.—Dorsal view of iliatete SaKfeii, x 1. (From an original drawing prepared for Professor Weldon.) of convergence, similar to that of Corystes and Albunea, but the case is complicated by the fact that some of the Oxystomata, and among them Matuta, show a certain amount of relationship to the Cyclometopous Portunids, so that it is just conceivable that the resemblances in the respiratory arrangement are due to a common descent and not to convergence. In the Leucosiidae, of which the Mediterranean Ilia nucleus (Fig. 130) is an example, the inhalant aperture is situated between the orbits, and leads into gutters excavated in the " pterygo- stomial plates" flanking the mouth, which are furnished with filtering hairs and are converted into closed canals by expansions of the exopodites of the third maxillipedes. Thus these Crabs possess a filtering apparatus independent of the chelipedes and of the margin of the carapace. Fam. 1. Calappidae.—Cephalothorax rounded and crab-like. The abdomen is hidden under the thorax, the antennae are small, and the legs normal in position. The afferent openings to the gill-chambers lie in front of the chelipedes. Male open- ings on coxae of last pair of legs. Gala-ppa (Fig. 128) circum-. 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 Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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