FIGURE 15 in New shallow water species of Caribbean Ircinia Nardo, 1833 (Porifera: Irciniidae)

FIGURE 15. Histological sections of Ircinia cf. reteplana USNM 1641982. A: Image showing moderately cored secondary fibers. A primary fiber terminates in a conule on the left of the image. B: Two primary fibers running in parallel, connected by a mesh of secondary fibers. A group of spicules is circled below the topmost primary fiber. Note the difference in the degree of coring of secondary fibers between A and B. Annotations follow Figure 3.