. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 314 MANUAL OF ZOOLOGY. tellidm, LittorinidiB (Periwinkles), Paludinidce (River-snails) Neritidm, Turbinidm (Top-shells), Haliotidm (Ear-shells), Fis- surellidce (Key-hole Limpets), Calyptrceidce (Bonnet Limpets), Patellida (Limpets), Dentalidce (Tooth-shells), and Fig. -Gasteropoda, a Holostomatous shell {Turri'tella camwimis)l b Siphonostomatous shell (Buccinum undaium}. Order II. Opisthobranchiata.—This order is'defined as follows:— "Shell rudimentary, or want
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 314 MANUAL OF ZOOLOGY. tellidm, LittorinidiB (Periwinkles), Paludinidce (River-snails) Neritidm, Turbinidm (Top-shells), Haliotidm (Ear-shells), Fis- surellidce (Key-hole Limpets), Calyptrceidce (Bonnet Limpets), Patellida (Limpets), Dentalidce (Tooth-shells), and Fig. -Gasteropoda, a Holostomatous shell {Turri'tella camwimis)l b Siphonostomatous shell (Buccinum undaium}. Order II. Opisthobranchiata.—This order is'defined as follows:— "Shell rudimentary, or wanting. Branchim arborescent or fasciculated, not contained in a special cavity, but more or less completely exposed on the back and sides, towards the rear iopisfhen) of the body. Sexes ;— (See Woodward's ' Manual.') The Opisthobranchiata, or " Sea-slugs," may be divided into two sections, the Tectibranchiata and Nudibranchiata, accord- ing as the branchiae are protected or are uncovered. The first section, that of the Tectibranchiata, is distinguished by the fact that the animal is usually provided with a shell, both in the larval and adult state, and that the branchiae are protected by the shell or by the mantle. Under this family are included the families of the Tomatellidce, Bullidce (Bubble shells), Aplysiadce (Sea-hares), Pleurobranchidce and PhyllidiadcR. In the second section, that of the Nudibranchiata (fig. in), the animal is destitute of a shell, except in the embryo condi- tion, and the branchiae are always placed on the back or sides of the body. This section comprises the families DoridcE (Sea-lemons), iyitotiiadiB, /Eolidce, Phylilrhoidce, and. 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 Nicholson, Henry Alleyne, 1844-1899. New York : D. App
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