360 THE ORIGIN OF VERTEBRATES 
Gegenbaur, in his picture, draws a straight tubule passing from every 
goblet among the fine canaliculi of the chitin. He says they are 
difficult to see, except in the case of the larger goblets. The tubule 
from the larger goblets is most conspicuous, and is in my sections 
always tortuous, never straight, as represented by Gegenbaur. A 
special branch of the appendage-nerve passes to these organs, and 
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IN 
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A 
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B 
Fig. 144.—A, A GOBLET FROM Fic, 145.—Tur Enpoenatus or Limvubus 
ONE OF THE BRANCHIAL SENSE- PUSHED OUT OF THE WAY ON ONE SIDE 
Orcans oF Limutus (ch.t., IN ORDER TO SHOW THE POSITION OF 
chitinous tubule); B, SurRFace THE FLABELLUM (fl.) PROJECTING TO- 
View oF 4 PorTION oF A BRAN- WARDS THE CRACK BETWEEN THE PRo- 
CHIAL SENSE-ORGAN. SOMATIC AND MrsosomaTic CARAPACES. 
upon the fine branches of this nerve groups of ganglion-cells are seen, 
very similar in appearance to the groups described by Patten on the 
terminal branches of the nerves which supply the mandibular organs. 
At present I can see no mechanism by which the goblets are extruded 
or returned into place. In the case of the Capitellide, Eisig describes 
retractor muscles by means of which the lateral sense-organs are 
