. Elementary text-book of zoology. Zoology. FIG. 603.—Acanthias vulqaris Spl, spiracle; K», gill slits. Order 3.— SELACHII* (CHONDEOPTERYGII). Cartilaginous Fishes ivith large pectoral and pelvic Jins, with transverse ventr ally-placed mouth, usually with Jive (rarely six or seven) pairs of branchial pouches and branchial slits. They have, a muscular conus arteriosus which contains several rows of valves. The intestine has a spiral valve. The Selachians differ strikingly in their outward appearance from all other Fishes (fig. 603), and present even among themselves great variations. The form a
. Elementary text-book of zoology. Zoology. FIG. 603.—Acanthias vulqaris Spl, spiracle; K», gill slits. Order 3.— SELACHII* (CHONDEOPTERYGII). Cartilaginous Fishes ivith large pectoral and pelvic Jins, with transverse ventr ally-placed mouth, usually with Jive (rarely six or seven) pairs of branchial pouches and branchial slits. They have, a muscular conus arteriosus which contains several rows of valves. The intestine has a spiral valve. The Selachians differ strikingly in their outward appearance from all other Fishes (fig. 603), and present even among themselves great variations. The form and position of the mouth, which is a broad transverse slit placed on the under surface of the snout, is an impor- tant distinguishing character. The skin usually contains a number of bony granules (ossified dermal papilla?, placoid scales), and obtains * Compare Joh. Miiller and J. Henle, •' Systematische Beschreibung der I'lagiostomen," rait (50 Steindrucktafeln. Berlin. 1841. Fr. Leydig, '• Beitriige zur mikroskopischen Anatomic und Entwickelungs- geschichte der Rochen und ; Leipzig. 1S52. C. Gegenbaur. •' Untcrsuchuugeii zur vergleichenden Anatomie der Wirbel- ; Leipzig. 1872. F. M. Balfour, :' A monograph on the development of Elasmobranch Fishes.'' C. Hasse. " Das natiirliche System der ; Jena. 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 the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
