. Elementary lessons in zoölogy : a guide in studying animal life and structure in field and laboratory . ASELLUS. External Features. — Place a live asellus in a watch crystal with water. Add a few drops of chloroform or ether. Observe as to its general form the following points : — 1. A nearly linear hody^ much flat- tened dorsally. 2. A distinguishable head^ with a pair of sessile eyes, and greater and lesser antennae, easily seen from above. 3. A long, distinctly segmented thorax^ bearing seven pairs of legs. 4. A short, broad abdomen^ with a pair of terminal sty- lets projecting posteriorl
. Elementary lessons in zoölogy : a guide in studying animal life and structure in field and laboratory . ASELLUS. External Features. — Place a live asellus in a watch crystal with water. Add a few drops of chloroform or ether. Observe as to its general form the following points : — 1. A nearly linear hody^ much flat- tened dorsally. 2. A distinguishable head^ with a pair of sessile eyes, and greater and lesser antennae, easily seen from above. 3. A long, distinctly segmented thorax^ bearing seven pairs of legs. 4. A short, broad abdomen^ with a pair of terminal sty- lets projecting posteriorly. As soon as the animal has become quiet, place the watch glass on the stand of the microscope, and with low power (100 diameters) focus upon various parts of the abdominal stylets. They are sufficiently transparent to permit the blood in them to be seen circulating. Obtain a specimen which has been a short time in alco-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
