. Outlines of zoology. nsidethe glassy case of the free-swimmingTunicate Pyrosoma, Division 3. Hoplocarida, with a carapacethat leaves at least four of the thoracicsegments free, with stalked eyes, with theeggs carried in a chamber formed by themaxilliped,es, with an elongated heart,and with a complicated . Order:—Stomatopods, Squilla, with resTra^r^uTte? ^^ ™ *^ second maxiUipedes forming very largerespira ory p a e . raptorial organs. Division 4. Eucarida, with a cephalo - thoracic shield uniting thehead and thorax segments ; with stalked eyes ; with a saccular heart;wit
. Outlines of zoology. nsidethe glassy case of the free-swimmingTunicate Pyrosoma, Division 3. Hoplocarida, with a carapacethat leaves at least four of the thoracicsegments free, with stalked eyes, with theeggs carried in a chamber formed by themaxilliped,es, with an elongated heart,and with a complicated . Order:—Stomatopods, Squilla, with resTra^r^uTte? ^^ ™ *^ second maxiUipedes forming very largerespira ory p a e . raptorial organs. Division 4. Eucarida, with a cephalo - thoracic shield uniting thehead and thorax segments ; with stalked eyes ; with a saccular heart;with eggs attached to the abdominal endopodites; with sphericalspermatozoa showing peculiar radiating pseudopodia; usually with acomplex metamorphosis. Order I. Euphausiacea :—shrimp-like surface and deep-water forms,with biramous thoracic limbs as in Mysids, Euphausia. Order 2. Decapoda:—with the three anterior thoracic limbsturned forward as maxiUipedes, with the other thoracic limbs almostalways Fig. 162.—An Amphipod(Caprella linearis). The two anterior thoracic seg-ments are fused to the head ;the abdomen is greatly re-duced and without append-ages ; the fourth and fifth MALACOSTRACA. 309 Sub-order Macrura.—Abdomen long. Homants (lobster); Neph-rops (Norway lobster, .sea crayfish); Astacus (fresh-water crayfish);Palinurus (rock lobster), whose larva was long known as the glass-crab (Phyllosoma); Penaus, a shrimp which passes through Nauplius,Zosea, and Mysis stages ; Lucifer and Sergestes are also hatched at astage antecedent to the Zosea ; Crangon vulgaris (the British shrimp) ;Palamon, Pandalus, Hippolyte (prawns); Galathea (with the abdomen
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
