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Show 1877. ] CRUSTACEA, CHIEFLY FROM SOUTH AMERICA. 677 rounded. ~ami of the uropoda subequal, narrow, oblong-oval, and abont reachmg to the posterior margin of the terminal segment. An~enn~ very slender; superior about half as long as the inferior, whICh Just reach to the anterior margin of the first segment of the body. These latter are eight-jointed, the third joint appearing twice as lo~g as the pre?eding, as if consisting of two coalescent joints, superIor antennre eIght-jointed. All the legs with the thigh-joints oblong, and very little dilated posteriorly, the last four pairs with the postero-superior margins slightly produced and carinated. Length about 1 inch, breadth 7 i lines. Hab. Dauria, R. Onon. A single specimen (female with ova) is in the collection. In this species the coxre are inserted in the angles between the segments of the body, in front of the anterior margin of each segment, not exterior to the lateral margin of the segment, as is usually the case. It is at once distinguished from the Cymothoa amurensifl, Gerstaecker, Mem. Acad. Imp. Sci. St.-petersbourg, viii. p. 278 (1859) by the slender femora, non-inflexed front, &c. LIRONECA LATICAUDA, sp. n. (Plate LXIX. fig. 5.) Ovate, slightly gibbous, moderately convex. Head small, front inflexed, and concealing the bases of the antennre. First segment of the body with the anteriOl' margin deeply excavate, antero-lateral lobes prominent and obtuse. Coxre of the followillg segments oblong and inserted externally to the lateral margin of the segment; in the first, second, and third segments the lateral margin is straight; in the fourth to seventh it is excavated. Terminal segment transverse, with the posterior margin rounded. Rami of the uropoda short, ovate, the outer twice as large as the inner, but not reaching halfway to the posterior margin of the segment. Length nearly 1 inch 3 lines. Hab. :M:anchuria. (ColI. Brit. Mus.) This species cannot be confounded with the foregoing. It is far more closely allied to the Li1'oneca novt£-zealandit£, described by me (Cat. New-Zeal Crust. p. 106, pI. iii. fig. 2, 1(76), which it altogether resembles in external appearance; in that species, however, the epimerre are longer in proportion to their width, and the rami of the uropoda subequal. In both L. laticauda and L. novt£-zealandice the posterior margin of the thigh-joint of the last four pairs of legs is produced at its proximal extremity and form~ a s~.rong tubercl~. In L. emarginata, Bleeker, Act. Soc. Indo.-N eerl. 11. p. 27, pI. 1. fig. 5 (1857), from Batavia, another nearly allied species,. the fro~lt is produced beyond the bases o~ the a?-tennre, and the postenor margm of the thigh-joints of the legs IS straIght. ANILOCRA, Leach. ANILOCRA TRICHIURA. (Plate LXIX. fig. 6.) Anilocra trichiu1'a, List Crust. Brit. Mus. p.108 (1847), sine descr. Narrow-oblong, oval, convex. Head small, with the anterior |