. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. STOMATOPODA. 471 The sub-order Stomatopoda, with which formerly the Sehizopoda, the genus Leucifer and the Phyllosomata (which are now known to be the larvae of Scyllarus and Palinurus) were united, is confined at the present day to the small and well-defined group of forms included in the Squillidce. They are Thoracostraca of considerable size and of elongated shape, with a broad, well-developed abdomen, which is much more extensive than the anterior part of the body and terminates in an e
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. STOMATOPODA. 471 The sub-order Stomatopoda, with which formerly the Sehizopoda, the genus Leucifer and the Phyllosomata (which are now known to be the larvae of Scyllarus and Palinurus) were united, is confined at the present day to the small and well-defined group of forms included in the Squillidce. They are Thoracostraca of considerable size and of elongated shape, with a broad, well-developed abdomen, which is much more extensive than the anterior part of the body and terminates in an extraordinarily large caudal fin. The cephalo-thoracic shield, which is formed of comparatively soft integument, is short and leaves at least the three large posterior thoracic segments to which the biramous swimming feet belong quite uncovered. The short segments of the maxillipeds also are not fused with the carapace. Appendages.—The anterior part of the head with the eyes and antennaa is movable, and the ventral portions of the following segments covered by the cephalo-thoracic shield are capable of limited movements upon one another (fig. 3G9), The anterior 4. FIG. 3G9.—Squilla mantif. A', A', antenna;; ITf, Iff, the anterior maxillipeds on the cephalothorax ; B', B", li'", the three pairs of biramous legs. internal antennas consist of a long three-jointed shaft, bearing three multiarticulate flagella. The second pair of antennae has a large scale on the outer side of the multiarticulate flagellum (fig. 3G9). The mandibles, which are placed far back, are provided with a slender three-jointed palp. The maxillae are relatively small and weak. The five following pairs of pediform appendages are crowded together close to the mouth, and on this account have been appro- priately described as oral feet. They all bear at their base a discoidal plate, which, in the case of the two anterior pairs, attains :i considerable size. The anterior pair alone (first maxillipod) i
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