. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 162 JOHN MAXWELL ANDERSON Hamann (1885). Cuenol (1887), Ludwig (1899). Schneider (1902), Chadwick (1923), and Hayashi (1935). There is considerable variation in details between various genera. In .Islcrias, the. innermost layer is a pseudostratified, columnar epithelium composed of tall, slender cells interspersed with mucous gland cells and secretory cells containing coarse granules; the distribution of these glandular cells varies in different parts of the stomach. Between the elongated bases of the epi- thelial cells run
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 162 JOHN MAXWELL ANDERSON Hamann (1885). Cuenol (1887), Ludwig (1899). Schneider (1902), Chadwick (1923), and Hayashi (1935). There is considerable variation in details between various genera. In .Islcrias, the. innermost layer is a pseudostratified, columnar epithelium composed of tall, slender cells interspersed with mucous gland cells and secretory cells containing coarse granules; the distribution of these glandular cells varies in different parts of the stomach. Between the elongated bases of the epi- thelial cells run the fibers of nerve cells constituting the "nerve layer" (Chadwick, 1923i or "neurollbrillar plexus" (Smith, 1937), varying in thickness in various regions. The extended basal processes of the epithelial cells rest upon, and often appear to intertwine with, the fibers of the connective-tissue layer lying just outside the neurofibrillar plexus. Beneath this collagenous and elastic coat (Fig. 4) are two layers of muscle fibers; the fibers of the inner layer take a generally circular. FIGURE 3. Portion of a channel system as viewed on the inner surface of the spread stom- ach. At a, intrinsic retractor bundle seen through the wall of the stomach; b, channels; c, esophagus; d, approximate plane of section shown in Figure 5. The eminences or ridges be- tween the terminal branches of the channel patterns are covered with the closely packed spe- cialized epithelial cells. course, while those of the outer layer are longitudinal. The longitudinal muscle layer is covered externally by the visceral peritoneum, which, as elsewhere in the body, consists of a single layer of approximately cuboidal, flagellated cel^. The connective-tissue layer appears to serve as the basement membrane of the epithelium and throughout its distribution sends short, branching fibers into the nerve layer and into the muscular layers. These fibers appear to be elastic strands which aid Maintai
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