The Journal of experimental zoology . be counted in the intactanimal, because of its faintness, but it seemed (see dotted line,fig. 7, B) that the straight-line relation between frequency andtemperature was departed from at the lower temperatures. c. In the attempt to localize possible areas of special thermalsensitivity, small volumes of warm water were applied from apipette to different regions of the animals surface. The an-terior end seemed the most sensitive part, but it was not deli-cately so. A stream of water running under low pressure from SENSORY REACTIONS OF CHROMODORIS ZEBRA 299 a
The Journal of experimental zoology . be counted in the intactanimal, because of its faintness, but it seemed (see dotted line,fig. 7, B) that the straight-line relation between frequency andtemperature was departed from at the lower temperatures. c. In the attempt to localize possible areas of special thermalsensitivity, small volumes of warm water were applied from apipette to different regions of the animals surface. The an-terior end seemed the most sensitive part, but it was not deli-cately so. A stream of water running under low pressure from SENSORY REACTIONS OF CHROMODORIS ZEBRA 299 a heated tank was allowed to flow over various portions of thesurface. A delicate thermometer held in a position correspondingto that of the part concerned was used to get some idea of thetemperature of the water stream. The current did not sea-water at 40°C., the buccal veil seemed the most sensi-tive part. The tentacles also gave good responses. The gillslikewise reacted locally to water of about this temperature. Not. 20 Z5 Fig. 7 Relation of the rate of the heart beat to temperature, in two individuals, A and B. until water was used issuing from the tube at a temperature ofnearly 50° were well-defined reactions had from the rhinophores,the tactile irritation occasioned by the stream can hardly havebeen very important in these experiments, since with the waterat a lower temperature issuing at the same rate the rhinophoreswere not activated. Efforts made in this way to localize a cold response werequite unsatisfactory. The gills react to water at 9° to 10° byweak contraction. 300 W. J. CROZIER AND LESLIE B. AREY Sunlight concentrated by a lens of 30-cm. focal length gavea very hot spot of light even when screened by 30 cm. of sea-water. This spot was allowed to fall upon different parts of Chro-modoris surface. Even though to ones hand the heat stimu-lation by this focussed beam was intense, it evoked only localreactions—absolutely restricted to
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1919
