siphuncular


si·phun·cle

S0433400 (sī′fŭng′kəl)n. A tubelike structure in the body of a shelled cephalopod, such as a nautilus, extending through each chamber of the shell.
[Latin sīphunculus, diminutive of sīphō, sīphōn-, siphon; see siphon.]
si·phun′cu·lar (-kyə-lər), si·phun′cu·late (-lĭt) adj.