. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 23 and at least three times as large as the posterior. The foot is large, anteriorly directed and with a large byssal gland. The cerebral and visceral ganglia are relatively large, club-shaped with a stout commissure. The pedal ganglia are also large but more rounded. The labial palps are well-developed and extend across approximately half of the body and have up to 14 broad internal ridges present on their inner face. The palp proboscides are moderately long. The gills are small with up to 18 alternating filam
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 23 and at least three times as large as the posterior. The foot is large, anteriorly directed and with a large byssal gland. The cerebral and visceral ganglia are relatively large, club-shaped with a stout commissure. The pedal ganglia are also large but more rounded. The labial palps are well-developed and extend across approximately half of the body and have up to 14 broad internal ridges present on their inner face. The palp proboscides are moderately long. The gills are small with up to 18 alternating filaments. The stomach is large and laterally distended. The proximal part of the hind gut penetrates deep into the foot, ventral to the pedal ganglia. It forms a single loop on the right side of the body. In external appearance the shells of the species can be easily confused with Yoldiella artipica (p. 25) although Y. hanna is slightly more inflated and the height/length ratio is slightly greater (Fig. 20). Nevertheless, hinge and teeth differ markedly, as does the hind gut configuration. Yoldiella capensis (new species) Type locality. Atlantis II, Cruise 42, Sta. 189, Cape Basin, , 23°00'S, 12°45'E, Epibenthic Trawl, 1007-1014 m. Type specimen. Holotype BM(NH) 1992026, Paratypes: in collection held by J. A. Allen. Material. Cruise Sta Depth (m) No Lat Long Gear Date CAPE BASIN Atlantis II 188 619- 70 23°'S 12°'E ES 42 622 189 1007- 1014 918 23°'S 12°'E ES 190 974- 979 15 23°'S 12°'E AD Only found at slope depths of the Cape Basin. Depth range: 619-1014m. Shell description (Figs. 21 & 22). Shell, subovate, moder- ately inflated, inequilateral, posteriorly somewhat wedge- shaped, smooth with a few fine concentric lines, periostracum pale straw-coloured; umbos slightly raised, inwardly directed; antero-dorsal margin convex, slopes steeply from umbo to anterior margin, dorsally posterior margin produced into ro
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