96 Account of a Journey across the claw, and the tarsus is broad with a diverging tooth. The first pair of feet is much broader than the second. The fol-lowing feet terminate with a long straight claw but slightly curved in the form of a hook at the apex only, the three pos-terior have merely a small foliaceous appendiculated member. I did not see the branchice at their base, but very distinctly the three pairs of pseudo-abdominal feet, which consist of a securiform, lamellar basal joint, and two articulated and ci-liated spines j so that there can be no doubt to which order of Crustacea this animal belongs. The cibarian apparatus seemed to me to consist of a marginated upper lip, a pair of mandibulae provided with biarticulated palpi, three (?) or four (?) pairs of lamellaceous maxillae, and two sex-articulated foot-jaws. Plate III. Fig. 5. Chelura terebrans. o. The animal lying on its side, magnified four times. h. The fourth and fifth caudal segment from above, as it appears when it is magnified fifteen times. c. The same from below. The third pair of false abdominal feet is evident at the basis. d. The first foot seen magnified twenty-five times. e. One of the posterior feet with the same power. [To be continued.] XI. — Ewtracts from a few rough Notes of a Journey across the Pampas of Buenos Ayres to Tucuman, in 1835. By James Tweedie, Esq., addressed to Sir W. J. Hooker. [Continued from p. 15.] This morning, the 26th, we regained the post-road which we had left at Pergamena, at 3 leagues beyond the post house of Cabeza del Tigere, 320 miles N.W. of Buenos Ayres. Here the tract turns more to the west, keeping along the east bank of the Rio Corcouneon, a most delightful tract to behold, being finely interspersed with woods of Algaroba and Chafieos, the river gli-ding on at the rate of about a mile in the hour, in a deep ravine whose sides are nearly perpendicular for 30 or 40 feet, espe-cially the east bank where the sun is so powerful as to dry up much of the vegetation, while on the west and north-west, where it is shaded from the midday rays, the crooked course
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