The Cambridge natural history . shed on the slideand boiled on it, after removing as much as possible of the broken shell. Theradula can then be searched for under the microscope, and washed and mounted onthe slide. The student must be warned that though the general process is simple, thereare difficulties in particular cases. In the Pulmonata, for example, membranes onboth sides of the radula need careful removal. Murex, Purpum, and most of theTaenioglossa have the side teeth folded down over the central, so that the arrangementis not well seen till they have been brushed back. The Cones, aga
The Cambridge natural history . shed on the slideand boiled on it, after removing as much as possible of the broken shell. Theradula can then be searched for under the microscope, and washed and mounted onthe slide. The student must be warned that though the general process is simple, thereare difficulties in particular cases. In the Pulmonata, for example, membranes onboth sides of the radula need careful removal. Murex, Purpum, and most of theTaenioglossa have the side teeth folded down over the central, so that the arrangementis not well seen till they have been brushed back. The Cones, again, have no basalmembrane at all, so that if the potash is not used with great care, the single teethwill fall asunder and be lost. Perhaps the worst case is where a large animal hasa radula as small as that of a Pisaoa like Turritclla, Harpa, or Struthiolaria, or 214 FUNCTIONS AND POSITION OF RADULA tion of the jaw, it comes within the province of the radiila, thefront part of which perhaps co-operates to a certain extent with. Fig. 110.—Jaws o^ Sepia: A, in siiu,witliin the buccal mass, several ofthe arms having been cut away ;B, removed from the mouth andslightly enlarged.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
