This dolphin is from 9 to 10 feet long; its body is large and cylindrical, of a brownish-gray color above and a pure white below. Its jaws, of equal length, are long, narrow, linear, armed on each side with 26 large conical, somewhat rugose teeth, with wide crowns. Its forehead is bomb-shaped, the eyes a little above the commissure of the lips. The pectoral fins are of considerable size, brownish at their extremities, and placed very low; the dorsal fin is elevated and semilunar. This dolphin, as its name shows, inhabits the mouth of the Amazon. It has a thick and fibrous skin, which we employ in medicine. (Before trying the drug, the prover had paroxysms of cough with suffocation, during which a hernia protruded with much force.) _First day._—1. Slight pain at the navel, after five minutes. Feeling of a quantity of air in the stomach, with grumbling in the abdomen. Pain at the loins, on rising in the morning. Eructations. 5. Violent smarting and excoriating pains, shifting from the right thigh to the heel, then to the right shoulder; these pains are aggravated by contact. In moving the right toes, the bones cracked as if notched. Quickly passing pain at the right eyebrow (when coughing, the hernia did not protrude any longer with so much force.) _Second day._—Doughy mouth. 10. He has not been troubled with suffocation and the cough is less. Headache. Violent colic with soft and strong-smelling stools. Pain in the loins. Hard abdomen, especially on the right side, where he feels like a ball which is painful when touched, in the evening. 15. Dry lips. _Third day._—Restless and disturbed sleep. (Cough continues.) Pain in the loins. The hardness in the abdomen has shifted to the left side. 20. Bleeding from the left nostril. (Before taking the drug he bled from the right nostril.) _Fourth day._—Acid stomach. (Cough with suffocation.) Erections, with sexual desire. Itching at the anus as from worms. 25. The bones of the thorax are affected with rheumatic pains. AMPHISBŒNA VERMICULARIS. AMPH. [Illustration] This species moves either backwards or forwards, as occasion may require, and is quite frequent in the woods of Brazil. Its body is cylindrical, from two feet to two and a half long, terminated by a very obtuse tail. It has no scales properly speaking, but its skin is divided into quadrilateral compartments disposed in rings round the body; 228 on the trunk and 26 on the tail. The lower lip is divided into six long and narrow plates; the head is small, rather sharp, protected by scutellæ, and not distinguished from the neck. It has small eyes; the jaw is not dilatable, the teeth are conical, bent, unequal and distinct from each other; the nostrils are on the sides, and pierced in a single naso-rostral plate. The amphisbœna is of a brownish color above, and a pinkish-white under the belly. The poison was taken from the living animal by cutting off part of its jaw, which was triturated immediately.