. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 63 loops to the left of the body with a further double loop passing to the left of the stomach into the foot anterior to the stomach. The loops do vary slightly in their extent and curvature. This is similar to the condition in Y. subcircularis, Y. biguttata and Y. ovata but with an additional loop on the right. The hind gut has a typhlosole along its entire length. Fine material similar to that present in the stomach was seen in the digestive diverticula of a number of specimens. The kidney is well-developed.
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 63 loops to the left of the body with a further double loop passing to the left of the stomach into the foot anterior to the stomach. The loops do vary slightly in their extent and curvature. This is similar to the condition in Y. subcircularis, Y. biguttata and Y. ovata but with an additional loop on the right. The hind gut has a typhlosole along its entire length. Fine material similar to that present in the stomach was seen in the digestive diverticula of a number of specimens. The kidney is well-developed. Sexes are separate. The maximum diameter of the ovum as observed in sec- tions of females from samples taken in February and August was similar (130 (xm). There seems to be a wide variation in the numbers of ova present. A female collected in August ( mm) had 255 ova while another collected in February ( mm) had only 65 ova. Maturing gonads were recorded for all months sampled. Yoldiellajeffreysi (Hidalgo 1877) Type locality. Valorous Sta. 16, Iceland Basin, west of Rockall Plateau, south Maury Channel, 55°10'N, 25°58'W, , Dredge, 1785 fm. Type specimen. Holotype: not designated; Lectotype: Natl. Mus., No. 199696 as here designated. Leda lata Jeffreys 1876, 1876. p. 431 (in part). Leda jeffreysi Hidalgo 1877, p. 396; Jeffreys 1879, p. 579, pi. 46, Fig. 2; Dall 1881, p. 124; Smith 1885, p. 234; Dautzen- berg 1889, p. 75; Dautzenberg & Fischer 1897, ; Locard 1898, p. 353. Portlandia jeffreysi Posselt 1898, Yoldiellajeffreysi Verrill & Bush 1898, p. 866, pi. 81, Fig. 5, pi. 83, Fig. 3. A holotype of Y. jeffreysi was never designated but the following USNM specimens were identified as syntypes by Waren (1980):- No. 1999695, Valorous Sta. 9; No. 199694, and No. 199696, Valorous Sta. 16; No. 199700, Porcupine Sta. 20; No. 199701, Porcupine Sta. 16 & 17; No. 199698 Porcupine Sta. 30. and in the BM(NH):- No. , Valorous St
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