. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Pacific Coast of North A merica. 159 Fiff. 1. Analytical Key to the Species o/Tanais. a. Inferior antennae scarcely half the length of superior antennae. Pereiopoda having the first three joints short and broad, affixed to sides of pereion like plates of mail 1. T. loricatus, Spence Bate. a'. Inferior and superior antennae of nearly equal length. Pereiopoda with joints not dilated, slender 2. T. alascensis, sp. n. 1. Tanais loricatus, Spence Bate. Tanais loricatus, Spence Bate
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Pacific Coast of North A merica. 159 Fiff. 1. Analytical Key to the Species o/Tanais. a. Inferior antennae scarcely half the length of superior antennae. Pereiopoda having the first three joints short and broad, affixed to sides of pereion like plates of mail 1. T. loricatus, Spence Bate. a'. Inferior and superior antennae of nearly equal length. Pereiopoda with joints not dilated, slender 2. T. alascensis, sp. n. 1. Tanais loricatus, Spence Bate. Tanais loricatus, Spence Bate, Lord's Naturalist in British Columbia, ii. (1866), p. 282. Hab. EsquimauU Harbour, British Columbia. 2. Tanais alascensis, sp. n. Body three and a half times longer than broad. Head large, narrowed anteriorly. Fron- tal margin almost straight. First pair of antenna? short, stout, consisting of four joints, the first joint being the longest. Second pair of antennse more slender, a little longer, consisting of four joints, the first joint being longest, and a rudi- mentary flagellum. Eyes small and pedunculated. The first segment of the thorax is con* fluent with the head. The second, third, fourth, and fifth segments increase slightly in length; the fifth and sixth are about equal; the seventh is not quite so long as the preceding one. The abdomen is composed of five seg- ments, the first three of which are sub- equal J the fourth is short, about half as long as any of the others and also nar- rower ; the terminal segment is as long as the two preceding ones together, and is rounded posteriorly, with a slight median notch. The segments of the abdomen decrease in width gradually from the first to the terminal segment. The terminal filaments are seven-jointed and single- branched, and are furnished at their ex- Tanaisalascensis,s^.vL. treraities with a few long hairs. x 8. o, dorsal view; The first pair of legs are stout and J'^J^^. J'^g j°"^*? °'' chelate; the propodus i
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