. Bulletin of the Natural History Museum Zoology. . Fig. 88 Yoldiella subcircularis. Dorsal view of the hind gut of a specimen from Sta. 80 North America Basin and a diagrammatic view of the course of the hind gut as seen from the left side. (Scale = mm). the shell antero-dorsally. There is also a double vertical extension of the hind gut deep into the foot. Thus, design advantage is taken of the exceptional length of the neck of the foot to accommodate a significant part of the greatly extended hind gut. The sexes are separate. Sectioned specimens larger than mm had maturing gonads. Th
. Bulletin of the Natural History Museum Zoology. . Fig. 88 Yoldiella subcircularis. Dorsal view of the hind gut of a specimen from Sta. 80 North America Basin and a diagrammatic view of the course of the hind gut as seen from the left side. (Scale = mm). the shell antero-dorsally. There is also a double vertical extension of the hind gut deep into the foot. Thus, design advantage is taken of the exceptional length of the neck of the foot to accommodate a significant part of the greatly extended hind gut. The sexes are separate. Sectioned specimens larger than mm had maturing gonads. The number of ova ranged from 37 ( mm) to approximately 140 ( mm) with a maximum ovum diameter of 132 \ and 156 um respectively. The gonads overlie the lateral and dorsal sides of the viscera. Mature females were present in February, June, August and October samples from the West European Basin. In two specimens from (Sta. DS76, Sta. DS79 respectively both mm total length), eggs were partially shed into the mantle cavity and had a maximum dimension of 156 Neverthe- less, there is no evidence to show that eggs are retained and incubated within the mantle cavity. Although the kidney is relatively small, it extends forward on either side of the stomach for a short distance. Yoldiella biguttata (new species) Type locality. Knorr Cruise 25, Sta. 299,Guyana Basin, , 7°'N, 55°'W, Epibenthic Trawl, 1942-2076 m. Type specimen. Holotype: BM(NH) 1992029. Paratypes: in collection held by J. A. Allen. Material. Cruise Sta Depth No Lat Long (m) Gear Date BRAZIL BASIN Atlantis II 167 943- 5 31 1007 ARGENTINE BASIN Atlantis II 245 2707 2 60 7°'S 34°'W ES - 7°'S 34°'W 36°'S 53°'W ES 8°'N 54°'W ES 8°'N 54°'W ES 7°'N 55°'W ES 8°'N 55°'W ES GUYANA BASIN Knorr 25 293 1456- 13 1518 295 1000- 2 1022 299 1942- 74 2076 301 2487- 44 2500 303 284
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Keywords: ., bhlconsortium, bookc, bookcentury1900, bookcollectionbiodiversity
