British reptiles and batrachians . Fig 1. (Half natural size) a, incurrentaperture; b, excurrent aperture. Fig 2. something like a leather sac or bottle (fig. 1). Just now I spokeof the microscope revealing new organisms and unexpected relation- 14 INTRODUCTION. ships, and here is a case in point. These Tunicafes, belongingto the division or sub-kingdom Molluscoid^e, were for a timeregarded as zoophytes, some of them sociably living, several in acolony, like buds on a stem, and even fixed to one spot (fig. 2). Though in their adult state they possess but slight indicationsof sensibility, they
British reptiles and batrachians . Fig 1. (Half natural size) a, incurrentaperture; b, excurrent aperture. Fig 2. something like a leather sac or bottle (fig. 1). Just now I spokeof the microscope revealing new organisms and unexpected relation- 14 INTRODUCTION. ships, and here is a case in point. These Tunicafes, belongingto the division or sub-kingdom Molluscoid^e, were for a timeregarded as zoophytes, some of them sociably living, several in acolony, like buds on a stem, and even fixed to one spot (fig. 2). Though in their adult state they possess but slight indicationsof sensibility, they have a heart, respiratory organs, and some ofthem a single eye in the middle of their transparent body; but inexternal form they have no resemblance whatever to a vertebratedanimal. Some features in their early development, however, givepromise of better things. They are at first free-swimming tad-poles, with an indication of backbone; and when we come totalk about the frog we will give another glance at these Tunicates.,which jus
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