. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 158 J. S. DICKSON ET AL. Figure 2. TEM of transporting gill filament after silver staining. Note crystals within and on the cuticle (arrows). Bar = 5 nm. Figure 3. TEM of respiratory gill filament after silver staining. Bar = pm. faced away from the stalk. A septum and the surrounding connective tissue separated the two major blood spaces. An epithelium, 80-90% of which occurred in the lacunar blood space, lined the noncalcified cuticle of the filaments. Epithelial cells extended across the lacunae forming pillar structu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 158 J. S. DICKSON ET AL. Figure 2. TEM of transporting gill filament after silver staining. Note crystals within and on the cuticle (arrows). Bar = 5 nm. Figure 3. TEM of respiratory gill filament after silver staining. Bar = pm. faced away from the stalk. A septum and the surrounding connective tissue separated the two major blood spaces. An epithelium, 80-90% of which occurred in the lacunar blood space, lined the noncalcified cuticle of the filaments. Epithelial cells extended across the lacunae forming pillar structures with their basal portion embedded in loose connective tissue. Also depicted is the marked difference in epithelial thickness within and between the filament types. In the transporting filaments, the cuticle epithelium bordering the afferent channel was the thickest (approx- imately 6 ^m) (Fig. 4). Numerous mitochondria, generally oriented perpendicular to the cuticle, were observed and were most abundant in the apical portion of the cells (Figs. 6, 7, 8). Apical microvillar processes were approximately 80 nm wide and varied in length from ^m to pm (Fig. 8). Electron-dense material was observed between the tips of the microvilli and the overlying cuticle (Fig. 9). Numerous infoldings and interdigitations occurred in the basal region of the epithelium (Figs. 6, 7). The micro- tubules observed within the cytoplasm were oriented nearly perpendicular to the cuticle and were often closely apposed to mitochondria (Fig. 8). Occasional golgi ap- parati were observed in the epithelium lining the outer margin of the afferent canal (Fig. 6), as well as a thin basal lamina (Figs. 6, 9). Adhering junctions occurred apically on lateral cell membranes, below which were septate junctions. Gap junctions were observed below the septate junctions (Fig. 6). The portion of the epithelium lateral to the septum and on the efferent side of the filament was thinner (approx- imately nm) t
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