. British and Irish Salmonidae. Salmon. 12 SALMONID^ OF BRITAIN, The head, whioh is comparatively large, is divided from the body by the gill- openings, while the eye (fig. 4 e) snb-divides it into two parts, that in front of this organ being termed the ante-orbital and that behind it the post-orbital region; in. 4, Outline of a young Loohleven trout, a. anal fin: ad. adipose dorsal fin: hr. branoMos- tegous rays: c. caudal fin: d. rayed dorsal fin : e. eye : interopercle ; lateral-line: m. maxilla: ma. mandible : n. nostrils: o. opercle : p. pectoral fin : fm. premaxilla : po.
. British and Irish Salmonidae. Salmon. 12 SALMONID^ OF BRITAIN, The head, whioh is comparatively large, is divided from the body by the gill- openings, while the eye (fig. 4 e) snb-divides it into two parts, that in front of this organ being termed the ante-orbital and that behind it the post-orbital region; in. 4, Outline of a young Loohleven trout, a. anal fin: ad. adipose dorsal fin: hr. branoMos- tegous rays: c. caudal fin: d. rayed dorsal fin : e. eye : interopercle ; lateral-line: m. maxilla: ma. mandible : n. nostrils: o. opercle : p. pectoral fin : fm. premaxilla : po. preopercle: so. Bub- opercle: suborbital ring : v. ventral fin : vt. vent: x. peduncle or free portion of the tail. the former is the snout wherein are placed the nostrils {ri) and the mouth. The region between the orbits is known as the inter-orbital space, while that below the orbit is the infra- or snb-orbital, with its ring of bones (^). The mouth is somewhat oblique, and rather protractile. The gill-covers or opercles consist of four pieces, the posterior and upper of which is the opercle or operculum (o). In front of it is the preopercle (^o). While of the two lower pieces, the posterior is known as the sub-opercle (so), and the anterior, situated below the preopercle, as the inter-opercle (). The body or trunk, which commences just behind the head, passes by almost imperceptible degrees into the caudal or tail portion, the vent (vt) separating the two regions. While the finless part between the adipose or dead fin of the back (ad) and the tail fin (c) is termed the peduncle or free portion of the tail (re). The skin is scaled, and the row of pierced scales that passes along the side is known as the lateral line (), the number on which may be useful in assisting in discriminating a species. If the composition of the fins in fishes of this family is examined, we perceive them to consist of soft rays that are either simple and undivided, or com- posed of nume
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1887
