. Fourteen weeks in zoology. Zoology. 348 SUBKIN6D0M MOLLUSCA. Helicidae (spiral-form).—The Land-snail has four tenta- cles, the longer pair with eyes at the extremity. It lays its eggs singly, while the other Orders lay theirs in chains.* Limacidae.—The Slugs are snails without the shell, or with only a rudimentary one coucealed in the mantle. ORDER OPISTHOBRANCHIATA. General Characteristics.—The Opisthobranchs (gills behind) are geaerally naked, with feathery gills behind the heart. Fig. lae. ^E6lis^ Britain. The toll's is typical of the order, having its gills arranged in tufts along the ba
. Fourteen weeks in zoology. Zoology. 348 SUBKIN6D0M MOLLUSCA. Helicidae (spiral-form).—The Land-snail has four tenta- cles, the longer pair with eyes at the extremity. It lays its eggs singly, while the other Orders lay theirs in chains.* Limacidae.—The Slugs are snails without the shell, or with only a rudimentary one coucealed in the mantle. ORDER OPISTHOBRANCHIATA. General Characteristics.—The Opisthobranchs (gills behind) are geaerally naked, with feathery gills behind the heart. Fig. lae. ^E6lis^ Britain. The toll's is typical of the order, having its gills arranged in tufts along the back, and the tentacles non-retractile. ORDER NUCLEOBRANCHIATA. General Characteristics.—The Nucleobranchs (clus-. Carinaria medlierranla. * If placed upon a pane of i^lase, by looking underneath, one can easily obserre JtB curiouB profession by means of a single 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 Steele, Joel Dorman, 1836-1886. New York, Chicago [etc. ] A. S. Barnes & Company
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1872
