. Bulletin of the Natural History Museum Zoology. . Fig. 99 Yoldiella insculpta. Lateral views from the right and left sides of the internal morphology of a specimen from Sta. S 65, West European Basin. (Scale = mm). For identification of parts see Fig. 34. between the siphons. The siphonal tentacle is large and found equally to either the right or left side of the siphonal embayment. There is a well-developed anterior sense organ. Adductor muscles are slightly unequal in size, the anterior being the larger. Gill plates are relatively small and difficult to count in preserved specimens (ma
. Bulletin of the Natural History Museum Zoology. . Fig. 99 Yoldiella insculpta. Lateral views from the right and left sides of the internal morphology of a specimen from Sta. S 65, West European Basin. (Scale = mm). For identification of parts see Fig. 34. between the siphons. The siphonal tentacle is large and found equally to either the right or left side of the siphonal embayment. There is a well-developed anterior sense organ. Adductor muscles are slightly unequal in size, the anterior being the larger. Gill plates are relatively small and difficult to count in preserved specimens (maximum recorded c. 18-20). The labial palps are well-developed with approximately up to 26 closely spaced ridges on each inner face. The palps extend between 1/3-1/2 across the body and each bears a long thin palp proboscis. The mouth is positioned a short distance posterior to the anterior adductor muscle. The foot is rela- tively large with a broad sole with a small papilla at the posterior limit. There is a large byssal gland in the heel (Fig. 100). The arrangement of pedal retractor muscles is similar to that of other species of Yoldiella. The cerebral ganglia are relatively large, the visceral ganglia are small and elongate. The pedal ganglia lie ventral to the style sac in the proximal part of the foot and are moderately large. The stomach is displaced slightly to the right of the body and is of moderate size with a large style sac. The hind gut configuration is unique. There are three loops to the right of the body and two. 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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