. The Cephalopoda. Cephalopoda. Oegopsida: Chiroteuthidae 246 whole arm to the tip, where those that are still developing are densely arranged (Plate XLIII, Figure 4, luc). The specimen from Sumatra has 58 organs on the right arm and 55 on the left arm; the arms of the specimen from Sagami Bay bear 52 organs. The suckers of the arms are arranged in two alternating rows; they become gradually smaller toward the tip. The larger suckers are acorn-shaped and 3 mm wide. They have thin muscular stalks, situated on a pigmented gelatinous cone and inserted in the concave, grooved ventral side of the p
. The Cephalopoda. Cephalopoda. Oegopsida: Chiroteuthidae 246 whole arm to the tip, where those that are still developing are densely arranged (Plate XLIII, Figure 4, luc). The specimen from Sumatra has 58 organs on the right arm and 55 on the left arm; the arms of the specimen from Sagami Bay bear 52 organs. The suckers of the arms are arranged in two alternating rows; they become gradually smaller toward the tip. The larger suckers are acorn-shaped and 3 mm wide. They have thin muscular stalks, situated on a pigmented gelatinous cone and inserted in the concave, grooved ventral side of the posterior third of the sucker (Plate XXXIX, Figures 4, 5). The opening of the sucker is surrounded by a dark chitinous ring which is broad dorsally and reaches to the middle of the sucker, but it is very thin on the ventral side. The proximal margin of the ring has a ridge which extends obliquely on the sucker (Figure 4). The dorsal half of the opening bears 10-12 densely arranged crenelated denticles which become larger toward the middle (Figure 5). The chitinous ring is finely granulate near the denticles, especially on the dorsal side. According to Joubin, the suckers of have crenelated denticles on the ventral side and there are additional rounded tubercle-like denticles which are irregularly distributed inside the sucker (p. 51, Plate 2, Figure 7). As Pfeffer (p. 185) stated, this condition is so unusual that I examined the suckers of the type specimens in Geneva. It appeared that many suckers show the normal pattern described above, with 10-12 crenelated denticles on the dorsal margin of the ring (Text Figure 26 a). In other suckers the chitinous ring forms hump-shaped thickenings inside its cavity, sometimes so numerous that they reach the outer margin (Text Figure 26 b). But such suckers, which are apparently pathological, always also have distinct crenelated denticles at the dorsal margin. '^ --v -C". Please note that these images are extracted from scan
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
