. Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-76 under the command of Captain George S. and the late Captain Frank Tourle Thomson, R. N. ous layer forming an investment to the nerve-tissue; prs, the proboscidian sheath inoutline. Fig. 8. Cerehratulus macroren, n. sp. A few sections further backwards. The medullary nerve m is,here more distinct, its anterior continuation m being on the point of coalescing with as in fig. 7. pr, outline of the proboscis ; Br, fibrous core of the brain-lobe. Fig, 9. Cm-ehratulus medullaius, n.
. Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-76 under the command of Captain George S. and the late Captain Frank Tourle Thomson, R. N. ous layer forming an investment to the nerve-tissue; prs, the proboscidian sheath inoutline. Fig. 8. Cerehratulus macroren, n. sp. A few sections further backwards. The medullary nerve m is,here more distinct, its anterior continuation m being on the point of coalescing with as in fig. 7. pr, outline of the proboscis ; Br, fibrous core of the brain-lobe. Fig, 9. Cm-ehratulus medullaius, n. sj). Transverse section of the medullary nerve (ui). pi, the i)lexus ;/5 and a, the circular and longitudinal muscular layers ; (inner circular muscular fibresare seen to form the outer layer of the proboscidian sheath); prn, the proboscidian sheathnerve, receiving delicate fibres from the medullary nerve and situated just above the pro-boscidian sheath musculature. Fig. 10. Cerehratulus mednllatus, n. sp. Integument and muscular body wall. Lettering as in fig. 2.(/;//, the deeper glands of the integument enclosed in the musculature. The Voyage of H M SChallen^i XII. prn. dp. > St-^»ioA |?,3p^(j;j -^-k^j 0^ Hiitii-eclit et ie Groot Jel EJir, C E R E B R A T U L U S . D R E P A N 0 P H 0 R U S . PIATE XIIL (ZOOL. CHALL. EXP. PART LIV. 1887.) Hhh. PLATE XIII. Fig. 1. Cerehratuhis corrugatus, MInt. Transverse section tlnough part of the superior brain-lobes anddorsal brain commissure. Part of tlie fibrous core (7i) is represented; its contimiatiou into thefibres of the commissure {) being distinctly noticed on the left side. On the right thisconnection is only visible a few sections further. The bulk of the brain-lobe is seen to con-sist of nerve-cells of different sizes (!); from these a cephalic nerve (<■«) is seen to emergeon the left, whereas this cellular coating is also continued over the commissure, and thereforms the starting point (
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