. Bulletin of the British Museum (Natural History) Zoology. Fig. AHLedella galatheae: a) Left lateral external view of holotype, b) right lateral external view of specimen from Biogas VI Station DS 78, c) right lateral internal view of specimen from Station 287, d) and e) lateral external views of shells in outline from Station 287. (Scales = 1 mm; a, b, d & e drawn to same scale). Morphology. As there were only three specimens available, the description of the internal morphology is based on one whole mount stained in haemotoxylin (Fig. 47). The mantle structures differ little from those
. Bulletin of the British Museum (Natural History) Zoology. Fig. AHLedella galatheae: a) Left lateral external view of holotype, b) right lateral external view of specimen from Biogas VI Station DS 78, c) right lateral internal view of specimen from Station 287, d) and e) lateral external views of shells in outline from Station 287. (Scales = 1 mm; a, b, d & e drawn to same scale). Morphology. As there were only three specimens available, the description of the internal morphology is based on one whole mount stained in haemotoxylin (Fig. 47). The mantle structures differ little from those described for L. pustulosa. The siphonal tentacle originates on the right side close to the base of the combined siphon. The adductor muscles are approximately equal in size and oval in shape; the long axes of the muscles are parallel to the shell margins. The foot is moderately large with a large byssal gland. The nervous system is well developed with a large pedal ganglion, situated in the anterior half of the neck of the foot. The cerebral and visceral ganglia are large and club-shaped. The gills have approximately 15 pairs of alternating plates. The palps are small with 8 broad ridges while the palp proboscides are slender although much contracted in the preserved speci- mens. (Fig. 47). The stomach and style sac are relatively large. The hind gut extends only a short distance into the foot before turning dorsally, posterior to the stomach. At the posterior dorsal margin of the body its course is to the right side of the body as far as the inner face of anterior adductor muscle where it. Fig. 49 Ledella galatheae: Dorsal view of specimen from Station 287. (Scale = 1 mm). crosses to the left side to form one loop before returning to the right again at the inner face of the anterior adductor. From there its course is dorsal to the anus. This configuration is but the elongation of the single-looped primitive condition. Please note that these images are extracted from scanned p
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