. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 155 intact . specimens. 12 3 4 Length mm. Fig. 56 Ledella solidula: Comparative histograms of size range of living and dead shells (see text for further explanation). The adductor muscles differ in size and shape. The anterior muscle is 2 or 3 times the size of the posterior, it is bean- shaped with the longitudinal axis parallel to the anterior margin. The posterior adductor is elongate-oval in shape with the longitudinal axis parallel to the dorsal margin. The siphon is moderately large and muscular with the s
. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 155 intact . specimens. 12 3 4 Length mm. Fig. 56 Ledella solidula: Comparative histograms of size range of living and dead shells (see text for further explanation). The adductor muscles differ in size and shape. The anterior muscle is 2 or 3 times the size of the posterior, it is bean- shaped with the longitudinal axis parallel to the anterior margin. The posterior adductor is elongate-oval in shape with the longitudinal axis parallel to the dorsal margin. The siphon is moderately large and muscular with the siphonal tentacle usually inserted to the right at the base of the siphon. The feeding aperture is well developed. The species has the greatest number of labial palp ridges of any species described here (22-28 depending on the size of the animal), however, the area of body covered by the palps is similar to that of most other species. The palp proboscides are large, long and in the contracted state, much folded. The gills are moderately well developed with 22-26 filaments. Posterior of the foot the inner demibranchs lie in close proximity to one another, those close to the base of the siphon appear to be interlocked. The foot is large, peripherally deeply papillate and with an extended heel. The 'byssal' gland is large. The pedal retractor muscles are similar to those described for L. pustulosa. The cerebral and visceral ganglia are relatively small and cylindri- cal in shape while the pedal ganglia are large. The stomach and style sac are large. The hind gut follows a course similar to that described for L. solidula with a single loop to the right and four or five coils to the left of the body. The number of coils immediately visible through the translus- cent shell varies from 2-5, coils overlain by others often being masked in lateral view (Fig. 60). In a subsample of nine sectioned individuals taken from Station 211 the number of coils varied, 5 specimens having 5 coils, the
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