. The Cambridge natural history. Zoology. OXYSTOMATA RESPIRATORY MECHANISMS 187 the chelipedes properly in position. The inhalant openings are situ- ated just in front of the chelipedes. It is a most remarkable fact that among the Cyclometopa, Lupa ^astoto(Fig. 13 l)has an exactly similar arrangement. Apparently we have here another instance. Fig. 129.â\}orsa.\ v\q\v of Matuta hanksii, x 1. (From an origiuiil drawing prepared for Professor Weldon.) of convergence, similar to that of Corystes and Alhunea, but the case is complicated by the fact that some of the Oxystomata, and among them Matuta
. The Cambridge natural history. Zoology. OXYSTOMATA RESPIRATORY MECHANISMS 187 the chelipedes properly in position. The inhalant openings are situ- ated just in front of the chelipedes. It is a most remarkable fact that among the Cyclometopa, Lupa ^astoto(Fig. 13 l)has an exactly similar arrangement. Apparently we have here another instance. Fig. 129.â\}orsa.\ v\q\v of Matuta hanksii, x 1. (From an origiuiil drawing prepared for Professor Weldon.) of convergence, similar to that of Corystes and Alhunea, 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 converf^ence. In the Leucosiidae, of which the Mediterranean Ilia imicleus (Fig. 130) is an example, the inhalant aperture is situated between the orbits, and leads into gutters excavated in the "pterygo- stoniinl plates" Hanking the mouth, which arc furiiislicd with tiltt-ring hairs and are converted into closed canals by cxpiinsions of the exopodites of the third maxillipedes. Thus these Crabs possess a filtering apparatus independent <it' llu; elielipedes and of the m;irgin of the carapace. Fam. 1. Calappidae.â(Je])IialoLhorax rounded ,111(1 (â ral)-like. Tlie aljdomen is hidden under tlu^ thonix, the antennae are small, and tlie legs normal in position. The afferent openings to the gill-eliambers lie in front of the chelipedes. Male ()i)en- ings on coxae of last pair of legs. Cahqipa (Fig. 12 8) eireum-. 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-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan
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