. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 E. S. CLELLAND AND A. S. M. SALEUDDIN. / m Figures i-ssorv boring organ (ABO) ot'Nucclla lamellosa. Figure 1. .! .in exerted ABO stained with Mallory-Hciden- hain quick slain. ^ h in shape of the organ. The cap is comprised ol pithi n-IK in .1 ! sinus (s). which is Aiih ihe sinus in the stalk. The stalk |. iclls ..( the AHO i,i|' lit long (200-300 jimi. w ini hborder(b) H\ imiiiasi. the epithelial cells of the sin , i nssiu-(arrow heads) are short (40 ftm). Muscle is seen in H fl .
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 E. S. CLELLAND AND A. S. M. SALEUDDIN. / m Figures i-ssorv boring organ (ABO) ot'Nucclla lamellosa. Figure 1. .! .in exerted ABO stained with Mallory-Hciden- hain quick slain. ^ h in shape of the organ. The cap is comprised ol pithi n-IK in .1 ! sinus (s). which is Aiih ihe sinus in the stalk. The stalk |. iclls ..( the AHO i,i|' lit long (200-300 jimi. w ini hborder(b) H\ imiiiasi. the epithelial cells of the sin , i nssiu-(arrow heads) are short (40 ftm). Muscle is seen in H fl . .it ihr .talk .iiul ix ;K used to retract the AHO ml" il , nlMiln in the foot. ku 200 Mm. muricids. in particular to that of Thais (N.) lapillus (Webb and Saleuddin. 1977). The cap of the ABO consists of a single layer of epithelial L-ells ie). surrounding a central sinus (s). The epithelial cells possess a distinct apical brush hiMiU-i (hi. The stalk of the ABO invaginates into the foot Mi. and also contains a sinus (s). The brush border of the epithelial cells is about 10-15 ^im in height, and the cells themselves are tall (200 300 /inn and thin, with irregular basal infoldings abutting the central sinus. There is no distinct demarcation between the epithelial cells and the sinus. Interstitial spaces can be seen between the cells, providing additional surface area to the sinus. Nuclei are identifiable in the basal third of the cells, and other or- ganelles occur distally to them. Strands of muscle and connective tissue can he observed spanning the sinus, loosely connecting the epithelium to the more muscularized stalk. The muscle in the stalk is probably involved in retracting the ABO into its vestibule within the foot. By contrast, the surrounding foot epithelium (arrow- heads) is composed of shorter columnar cells (—40 in height) without a brush border. An obvious basement mem- brane underlies these cells, separating them from the foot tissue
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
