William Herschel discovered NGC 3367 = H II-78 = h748 on 19 Mar 1784 (sweep 177) and simply noted "pB". His position was off by 15' (too far northwest), but he measured a more accurate position on a later sweep. On 4 Apr 1831 (sweep 338), John Herschel noted, "pB; vL; irreg R; vgbM; 2' diam" and measured an accurate position in sweep 338. The description under h748 on 23 Mar 1830 (sweep 242) also probably refers to NGC 3379.

On 23 Mar 1851, Bindon Stoney noted "probably spiral, dark spaces in it and * suspected in preceding edge."

200/250mm - 8" (3/28/81): fairly bright, slightly elongated, slightly brighter core. Located about 25' SSE of 5th magnitude 52 Leonis.

300/350mm - 13.1" (2/25/84): fairly bright, fairly large, almost even surface brightness, slightly elongated ~E-W. NGC 3377 lies 20' NE.

Notes by Steve Gottlieb