Beitrage zur Kenntnis der Gephyren. Zeit. Wiss. Zool. Bd. xxxiv.
Ward, H. B.
1891
Some points on the anatomy and history of Sipunculus nudus. Bull. Mus. Comp. Zool. Harvard College.
(Contribution from the Zoological Laboratory of Pomona College)
EXPLANATION OF FIGURES
Figure 1. Central nervous system of Phascolosoma ×15. The cord is shown in three separate pieces. The lower end of the first or left-hand drawing should join with the second and so on. The central nerve band is shown with the lateral branches of muscle and nerve. The brain is shown attached to the first segment at the left. The pigment spots, cerebral tubes and chief nerves are shown. The brain is drawn from reconstructions made from serial sections.
Figure 2. Cross section of the nerve cord. ×75.