Journal of Entomology and Zoology . nis der Gephyren. Zeit. Wiss. Zool. Ward, 1891 Some points on the anatoim and historj of Sipunculus Mus. Comp. Zool. Harvard College. (Contribution from the Zoological Laboratory of Pomona College) Pomona College, Clarcmont, California 33 EXPLANATION OF FIGURES Figure 1. Central nervous system of Pliascolosoma X15. The cord is shown inthree separate pieces. The lower end of the first or left-hand drawing should joinwith the second and so on. The central nerve band is shown with the lateral branchesof muscle and nerve. The brain is s
Journal of Entomology and Zoology . nis der Gephyren. Zeit. Wiss. Zool. Ward, 1891 Some points on the anatoim and historj of Sipunculus Mus. Comp. Zool. Harvard College. (Contribution from the Zoological Laboratory of Pomona College) Pomona College, Clarcmont, California 33 EXPLANATION OF FIGURES Figure 1. Central nervous system of Pliascolosoma X15. The cord is shown inthree separate pieces. The lower end of the first or left-hand drawing should joinwith the second and so on. The central nerve band is shown with the lateral branchesof muscle and nerve. The brain is shown attached to the first segment at the left. Thepigment spots, cerebral tubes and chief nerves are shown. The brain is drawn fromreconstructions made from serial sections. Figure 2. Cross section of the nerve cord. X75. Figure 3. Longitudinal section of the nerve cord. X75. Figures 4 to 6. Drawings of sections taken through the brain at various levels,only one-half is shown in each case. X75. 34 Journal of Entomology and Zoology. Pomona College, Claremont, California 35
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