The following families and genera are represented on the British coasts: Carinellidae, Cannella; Cephalothricidae, Cephalothrix, Carinoma; Eunemertidae, Eunemertes; Ototy Phlone Me Rtidae, Ototyphlonemertes; AM PHI PO Ridae, Amphiporus, Drepanophorus; TET Rastemmidae, Tetrastemma, Prosorhocmus; M Alacobdellidae, Malacobdella; Eu Poliidae, Eupolia, Valencinia, Oxypolia; Lineidae, Lineus, Euborlasia, Micrura, Cerebratulus, Micrella.
Again, if G be the mass-centre of four particles a, $, 7, situate at the vertices of a tetrahedron ABCD, we find a: ~ :~: tet GBCD: tetUGCDA: tetGDAB: tetGABC, and by suitable determination of the ratios on the left hand we can make G assume any assigned position in space.
Not only is there a total lack of those passes, so common in the Alps, which lead across the great mountain chains at a far lower level than that of the neighbouring peaks, but between the two extremities of the range, where the principal highroads and the only railways run between France and Spain, there are only two passes practicable for carriages - the Col de la Perche, between the valley of the Tet and the valley of the Segre, and the Col de Somport or Pot de Canfranc, on the old Roman road from Saragossa to Oloron.
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