3."U) Mr. G. A. Boulcngcr on Fishes, Batrachianit, mental barbel ^ the diameter of the eye. Gill-rakers long and slender, 11 on lower p.art of anterior arch. First dorsal with five feeble simple rays, the first the longest and measuring ^ the length of the head. Second dorsal much more developed than and narrowly separated from the first, with 12 rays, all branched except the first ; second and third longest, as long as the head. Third dorsal with 38 short feeble rays, its base shorter than its distance from the second dorsal. Anal originating a little in advance of the second dorsal, composed of 103 subequal rays, which measure about \ the length of the head. Pectoral rather high up the side, with 15 rays, about f the length of the head. Longest ventral ray 1^ the length of the head. Caudal fin obtusely pointed, half the length of the head. 140 scales in a longitudinal series, 17 between the origin of the second dorsal fin and the lateral line, which is perfectly distinct. Yellowish brown, finely speckled with dark brown ; abdominal region bluish black. Total length 210 mlllim. I am indebted to Dr. J. D. F. Gilchrist for the favour of describing this most interesting fish, with which it gives me great pleasure to connect the name of its discoverer. The single specimen sent to me was obtained some 40 miles off Tabic Mountain, at a depth of 250 fathoms. LVI. — List of the Fishes, Batrachians, and Beptiles collected by the late Mr. P. 0. Simons iii the Provinces of Mendoza and Cordova, Argentina, ^j G. A. BOULENGER, F.R.S. Fishes. 1. Trichomyclerus Borellii, Blgr. — Rio Mendoza, Palmira, 900 m. 2. Trichomyclerus Burmeisteri, Berg. — Rio Mondoza, Pal-mira, 900 m. 3. Jenynsia pygogramma, sp. n. D. 8-9. A. 9-10. L. lat. 32-35. Closely allied to J. lineata, Jen., but scales on the back much smaller, 18 to 25 transverse series between the occiput and the dorsal fin. Depth of body equal to length of head and contained 4 times in tot:il length. Golden yellow above, speckled and spotted with black, white beneath; a more or
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