GLOSSARY OF TECHNICAL TERMS. 95 
0. 
Oar'ed, a. An oared foot (L. stegano'pus) has the hind toe or hallux united 
on one side with the anterior toes by a web or connecting membrane. 
Hence the name Steganopodes, applied to the group including the 
Pelicans, Cormorants, etc., in which the feet are of this character. 
Obcord'ate (L. obcorda'tus), a. Shaped like an inverted heart. 
Oblique' (L. obli'quus), a. Slanting; crossing, or running, diagonally. 
Ob'long (L. oblon'gus), a. Longer than broad. 
Qbome'goid (L. obome' 'goideus) , a. Obversely omegoid. (Plate XV. 
fig. 8.) 
Obo'vate (L. obova'tus), a. Inversely ovate. (Plate XIV. fig. 6.) 
Obscure' (L. obscu'rus), a. Dusky, or without distinct definition; little 
known. It is sometimes improperly used in the same sense as obsolete, 
but the two terms are quite distinct in meaning ; an obscure or obscured 
marking is one which is rendered indefinite by a suffusion with the 
surrounding color ; an obsolete marking is one rendered indistinct by 
lack of intensity or depth of color. 
Ob'solete (L. obsole'tus), a. As applied to words or writings, disused or 
neglected. In the natural-history sense, indistinct, rudimental, faded. 
An obsolete spot, or bar, is one which, while representing a well- 
developed marking on another individual of the same species, or on 
another species with which the one being described is compared, 
is nearly or quite wanting from encroachment of the adjacent color, 
or lack of intensity of color in itself. Hence, obsolete, as used in 
this sense, is quite distinct from obscure, often improperly treated 
as synonymous ; an obscure spot or other marking being one which 
lacks distinct definition through suffusion of its own color with 
that adjacent. 
Obtuse' (L. obtu f sus), a. Blunt. (Opposed to acute.) 
Occip'ital (L. occipila'Us), a. Pertaining to the hind-head, or occiput. 
Oc'ciput (L.), n. The back part of the head, bounded below by the nape, 
anteriorly by the vertex. (Plate XI.) 
Oc'ellate (L. ocella'tus), a. Marked with ocelli, or eye-spots. (Plate XIV. 
fig. 3.) 
Ocellus (L. ; pi. ocel'li), n. A distinct, rounded, usually brightly colored 
spot, more or less resembling the " eyes," or ocelli, of a Peacock's 
train. 
Ochra'ceous, \ (L. ochra'ceus), a. Of the color of certain ochre pigments ; 
Och'reous, > a brownish orange color, or intense buff. (Light 
Och'rey, ) ochre, No. 2, of Schoenfeld.) (Plate V. fig. 7.) 
Ochra'ceous-Buff (L. ochra'ceo-lu'teus), n. (Yellow ochre + burnt sienna + 
white.) (Plate V. fig. 10.) 
