. Bulletin of the Natural History Museum (Zoology). . Fig. 17 Erenna comma. A. young tentillum of first type. Scale mm. B. Two views of mature tentillum of first type. Scale 1 mm. contraction in the length of the pedicle itself. The canal penetrated through the saccus of the cnidoband to its tip. The saccus was largely filled by large, vacuolate gastrodermal cells that formed a reticulate pattern. The nematocysts were restricted to four circular swellings; two lateral, one proximal, one distal. Three types of nematocysts were present and arranged so that the larger anisorhizas, measuring c
. Bulletin of the Natural History Museum (Zoology). . Fig. 17 Erenna comma. A. young tentillum of first type. Scale mm. B. Two views of mature tentillum of first type. Scale 1 mm. contraction in the length of the pedicle itself. The canal penetrated through the saccus of the cnidoband to its tip. The saccus was largely filled by large, vacuolate gastrodermal cells that formed a reticulate pattern. The nematocysts were restricted to four circular swellings; two lateral, one proximal, one distal. Three types of nematocysts were present and arranged so that the larger anisorhizas, measuring c. 130 x 35 urn. surrounded the smaller (?) haplonemes; the more cylindrical ones measuring 32 x 11 urn, and the more ovoid ones 41 x 14 urn. The youngest of the other type of tentillum (Fig. 18A) comprised a short, thickened pedicle, a long cnidoband, and a short terminal process, which had a circular spot of distinctive epidermal cells on one side. The broad gastrovascular canal was present throughout and. in the terminal process, it appeared to bend back and continue, for a short distance, toward the saccus of the cnidoband. However, even in the smallest tentilla examined, the saccus had already been occluded by gastrodermal cells. The nematocysts had begun to accumulate into an undulating series of connected swellings on one side of the saccus. Only a few mature tentilla (Fig. 18B) of the second type were found with the specimen. In these the pedicle remained short and broad and was largely filled by the gastrovascular canal. The cnidoband had increased greatly in length and was largely filled by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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