The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . Typhis,Sphcsroma, Tylos, and Armadillo, figured above, and in theapterous genus Glomeris, subsequently figured, betweenwhich tribes there is a considerable hiatus. The genera Ca-hjmene and Asaphus, amongst the Trilobites, on account oftheir contractility, evidently approach the Glomeris and someof the isopodous Crustacea {Spharoma); but the Trilobiteshave the terminal segment of the body entire, and not fur-nished with lateral swimm
The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . Typhis,Sphcsroma, Tylos, and Armadillo, figured above, and in theapterous genus Glomeris, subsequently figured, betweenwhich tribes there is a considerable hiatus. The genera Ca-hjmene and Asaphus, amongst the Trilobites, on account oftheir contractility, evidently approach the Glomeris and someof the isopodous Crustacea {Spharoma); but the Trilobiteshave the terminal segment of the body entire, and not fur-nished with lateral swimmerets, as in the Sphceromce j thesame negative character however exists in the Glomeris, andespecially in the genus Tylos, of which the upper side of thethoracic segments is divided into three lobes. The discoveryof the isopodous genus Serolis on the coasts of Patagonia hasafforded another proof of the correctness of Latreilles ideaof the osculant situation of these creatures between theIsopoda and the mpiapodous insects, the eyes in that genusbeing situated in the same vertical situation, and of thesame lunate form, as in the Trilobites. Moreover, the body. Asaphus expansus. : rolled up. is longitudinally divided into three lobes, like the legs and caudal swimmerets scarcely extend beyond the 124 TRILOBITES- sides of the body; but the antennae are very large and dis-tinct. This genus has lately been described and figured indetail in the Transactions of the Albany Institute, by Eights, under the name of Brongniartia. Much ofthis diversity of opinion has resulted from the very muchworn state of the Trilobites, which have, in many instances,been so rubbed, that their eyes have been entirely effaced;but it is questionable whether any Trilobite was ever desti-tute of those organs, which Dr. Buckland has, in his Bridge-water Treatise, described at great detail, in connexion withtheir fitness for the situations in which the animals are sup-posed to have reside
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Keywords: ., bookau, bookcentury1800, booksubjectcrustacea, booksubjectinsects
