PLATE 12. 
Fic. 60. Center of a young Cestum veneris, 84 mm. long. Tortugas, 
Florida, May 25, 1907. 
Fic. 61. Center of a mature Cestum veneris. Tortugas, Florida, 
July 4, 1907. ad, adradial vessels; 7, funnel; 7#, axial 
funnel-tube; g, paragastric canals; 7, interradial canals; 
mu, muscle fibers; st, subtentacular meridional canals; 
sto, stomodzeum; sv, subventral meridional canals; 2, 
tentacular canals; ten, tentacle-bulb; ts, opening of ten- 
tacle-sheath. 
Drawn from life, by the author. 
