. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 57 and well-developed. The labial palps are large, with up to 32 closely spaced ridges on each inner face. In some of the largest specimens (> mm) the anterior part of the palps are frequently folded in on themselves. The palp proboscides are relatively small and slender. The foot is conspicuous, being long and thin, with a much extended narrow neck and a long divided papillate sole. Gland cells are present along the ventral part of the sole and surrounding the aperture of a large byssal gland. Pedal ret
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 57 and well-developed. The labial palps are large, with up to 32 closely spaced ridges on each inner face. In some of the largest specimens (> mm) the anterior part of the palps are frequently folded in on themselves. The palp proboscides are relatively small and slender. The foot is conspicuous, being long and thin, with a much extended narrow neck and a long divided papillate sole. Gland cells are present along the ventral part of the sole and surrounding the aperture of a large byssal gland. Pedal retractor muscles are less conspicu- ous in this species than in others described here. The central haemocoele of the foot is extensive. The cerebral and visceral ganglia are relatively small, circular in transverse vertical cross-section. The visceral ganglia are some distance anterior to the posterior adductor muscle. The pedal ganglia lie at the dorsal limit of the extended neck of the foot close to its junction with the body, they are large and elongate with large associated statocysts dorsal to them. The mouth is displaced a short distance posteriorly from the anterior adductor muscle. The stomach and style sac are moderately large. Two broad sorting ridges can be seen on the right anterior wall of the stomach. A prominent gastric tooth is present on the left dorsal wall and posterior to it the gastric shield extends over the left and most of the right walls of the stomach. The major typhlosole extends along the right side of the stomach. The digestive diverticula lie either side and anterior to the stomach. The duct of the right digestive diverticulum curves dorsally over the hind gut and enters the stomach on the right anterior dorsal wall. A duct from one left diverticulum enters the stomach far anterior on the left dorsal side, and immediately posterior to it, a short duct from a second left diverticulum enters the stomach, ventral to the gastric tooth. Material similar t
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Keywords: ., bhlconsortium, bookc, bookcentury1900, bookcollectionbiodiversity
