This shell, though sufficiently intelligible among the figures of Kircher’s shells, engraved and published by Bonanni, and also in the works of Lister and some others, escaped the notice of Linnæus. So late as the tenth edition of Systema Natura it does not appear. Gmelin describes this shell with much accuracy in his edition of the last mentioned work, under the specific name of Scapha. ------------------------------------------------------------------------ [Illustration: _5_ _London. Published as the Act directs, by E. Donovan & Mess.^{rs} Simpkin & Marshall, May 1.^{st} 1822._ ] ------------------------------------------------------------------------ ORNITHOLOGY. PLATE V. TROCHILUS PELLA, TOPAZ HUMMING-BIRD. PICÆ. GENERIC CHARACTER. Bill subulate or awl-shaped; filiform, tubular at the tip and longer than the head; upper mandible forming a sheath for the lower. Tongue filiform, the two threads coalescing, and tubular feet formed for walking; tail composed of ten feathers, in general. * Bill incurvate. SPECIFIC CHARACTER AND SYNONYMS. Red; middle tail feathers very long; body red; head brown; throat golden green; rump green. TROCHILUS PELLA: ruber rectricibus intermediis longissimis, capite fusca, gula aurata uropygioque viridi.—_Linn. Syst. 1. p. 189. 2._ _Gmel. t. 1. p. 1. 485. 2._ TROCHILUS PELLA: curvirostris ruber, rectricibus intermediis longissimis, corpore rubro, capite fusco, gula aurata uropygioque viridi. _Lath. Orn. 1. p. 302. 2._ Polytmus Surinamensis longicaudus ruber.—_Briss. 3. p. 690. 15._ Falcinellus gutture viridi.—_Klein, Av. p. 108. 15._ Le Colibri topaze.—_Buff. 6. p. 46._—_Pl. Ent. 599._ TOPAZ HUMMING-BIRD.—_Lath Syn. 2. p. 746. 2._ * * * * *