. The Australian zoologist. Zoology; Zoology; Zoology. Qk' sSr. Fig 2 (1). Exterior (tegmen- (2).-Interior (articulamentum) turn) of Rhyssoplax canaliculate of same. , antenor, one median, and posterior ti<m , S—Slits, valves. A.—Apex, —Sutural laminae, C.—Central areas, L.— Lateral areas, J.—Jugum, M.— Mucro, —Ante-mucronal area, —Post-mueronal area. The Shell.—The shell of a Loricate consists of eight pieces, called valves, held together by a leathery girdle. These valves, which are composed of a chitinous foundation, reinforced by carbonate of l
. The Australian zoologist. Zoology; Zoology; Zoology. Qk' sSr. Fig 2 (1). Exterior (tegmen- (2).-Interior (articulamentum) turn) of Rhyssoplax canaliculate of same. , antenor, one median, and posterior ti<m , S—Slits, valves. A.—Apex, —Sutural laminae, C.—Central areas, L.— Lateral areas, J.—Jugum, M.— Mucro, —Ante-mucronal area, —Post-mueronal area. The Shell.—The shell of a Loricate consists of eight pieces, called valves, held together by a leathery girdle. These valves, which are composed of a chitinous foundation, reinforced by carbonate of lime, may be separated from the girdle by soaking the shell in water for a few hours, or in the case of dried specimens, by boiling in a 5 per cent, solution of caustic soda. They are of three forms; the head or anterior valve; six central or median valves, all of the same shape but differing slightly in dimensions; and the tail or posterior valve. They are some- times referred to by consecutive numbers, 1 to 8, commencing with the anterior valve, which overlaps the first median valve, which in turn overlaps the second, and so on, the seventh (or sixth median) valve overlapping the anterior edge of the posterior valve. Each valve is composed of two or more layers, the outer or surface being called the tegmentum, and the inner called the articulamentum. The tegmentum in nearly all Loricates is divided into more or less clearly defined^ areas, which are adorned with the sculpture, or the colour-pattern which forms the basis of specific variation. The median valves are divided into two lateral areas, and two central areas connected by a dorsal area, or jugum, extending along the ridge of the .valve, the posterior extremity of which, if projecting, is called the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble th
Size: 1825px × 1369px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1914
