3. _Osphromenus siamensis._ D. 7/8. A. 11/33-12/35. L. lat. 42. L. transv. 12/16. When we take the origin of the dorsal fin as the highest point of the upper profile, and the base of the last anal spine as the lowest of the abdomen, the depth between these two points is one-half of the total length (the caudal not included). The length of the head is three times and two-thirds in the same length. The snout is broader than long, equal to the diameter of the eye, which is one-fourth of the length of the head. The interorbital space is convex, wider than the orbit. Mouth very small, rather protractile; præorbital, with its extremity truncated and serrated: angle of the præoperculum serrated; there are two or three series of scales between the eye and the angle of the præoperculum. The dorsal fin commences nearer to the root of the caudal than to the end of the snout; it has six strong spines, which increase in length posteriorly, the last being longer than one-half the length of the head. Caudal emarginate; the anal is nearly entirely scaly, and terminates immediately before the caudal. The longest ventral ray extends beyond the extremity of the caudal, and has three or four rudimentary rays in its axil. The colour is greenish on the back, silvery on the sides and on the belly. A black spot on the middle of the body in the vertical from the origin of the dorsal, below the lateral line; a second on the middle of the root of the caudal. The soft dorsal and caudal with brown dots; anal yellowish, with lighter spots, and sometimes with brownish dots. This description is taken from specimens which are from three to four inches long. (Günth., Fishes, iii. p. 385.) 4. _Osphromenus microlepis._ D. 3/10. A. 10/39. L. lat. 60. L. transv. 12/22. The height of the body is one-half of the total length (without caudal), the length of the head two-sevenths; the profile of the nape is convex, that of the head rather concave. The snout is somewhat depressed, broader than long, with the lower jaw prominent; the interorbital space is convex, nearly twice as wide as the orbit, the diameter of which is one-fifth of the length of the head, and less than that of the snout. Præorbital triangular, with the lower margin serrated; there are five series of scales between the orbit and the angle of the præoperculum. The entire lower margin of the præoperculum and a part of the sub- and inter-operculum are serrated. The dorsal fin commences on the middle of the distance between the snout and the root of the caudal; its spines are moderately strong, the length of the third being more than one-half of that of the head. Caudal emarginate; more than one-half of the anal fin is scaly; it terminates immediately before the caudal. The longest ventral ray extends beyond the extremity of the caudal, and has three rudimentary rays in its axil. Immaculate: back greenish, sides and belly silvery; the soft dorsal and caudal with brownish dots. Total length six inches.