A history of the British sessile-eyed Crustacea . ese charac-ters will at once distinguish the genus both from Sphceromaand Dynamene, which latter has been united with it as asecond section by Professor Milne Edwards. The head is nearly as broad as the broadest part of thebody. The flagella of both pairs of antennae are multi-articulate. The penultimate segment of the tail (formingthe posterior margin of the consolidated basal mass) isprolonged in the middle and emarginate, the terminalsegment bearing in the centre of its upper surface a com-pound tooth or spine, and the extremity of the tail
A history of the British sessile-eyed Crustacea . ese charac-ters will at once distinguish the genus both from Sphceromaand Dynamene, which latter has been united with it as asecond section by Professor Milne Edwards. The head is nearly as broad as the broadest part of thebody. The flagella of both pairs of antennae are multi-articulate. The penultimate segment of the tail (formingthe posterior margin of the consolidated basal mass) isprolonged in the middle and emarginate, the terminalsegment bearing in the centre of its upper surface a com-pound tooth or spine, and the extremity of the tail isdeeply notched, with a short horn or lobe in the middleof the notch. The foot-jaws have the intermediate jointsprolonged on the inner margin, the of the lobesthus formed being thickly ciliated. The lateral appen-dages of the tail have two small lobes, which are stronglyciliated with stiff short hairs, which also are thicklyscattered upon the upper surface of the segments of thetail. 426 SPH^*:. CYMODOCEA TRUNCATA. Specific character. Pleon eliglitly granulated ; fourth segment with twosmall tubercles in the middle of the hind margin ; terminal segment withtwo larger dorsal tuhercles, followed by a central oval, very setose tubercle,and three terminal spines, which are truncated. Length, five-twelfths of an inch. Oniscus truncata. Montagu MSS. in Brit. Mus. Leach, Edinb. Enc. vii. p. 433. Trans. Linn. xi. p. 303. Suppl. Enc. Brit. i. 427. Dictionn. Sci. Nat. xii. p. 343. Samouelle, Ent. Compend. p. 108. Desmarest, Cons. Crust, p. 297. Milne Edwards, Crust, iii. p. 214. W. Thompson, in Ann. Nat. Hist. XX. p. 246. White, B. M. Cat. Brit. Crust. p. 76. Pop. Hist. Brit. Crust, p. 246. Gosse, Man. Mar. Zool. 1, fig. 236. Our figure of this species is made from Dr. Leachstypical specimen preserved in the British Museum. Itis very nearly allied to the following species, but it ismuch less rugose, and the for
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Keywords: ., bookauthor, bookcentury1800, bookdecade1860, booksubjectcrustacea
