. Bulletin of the Natural History Museum Zoology. Fig. 63 Yoldiella inconspicua inconspicua. Lateral view from the right side of the internal morphology of a specimen from Sta. 72, North Atlantic Basin. (Scale = mm). For identification of the parts see Fig. Length (mm) Fig. 64 Yoldiella inconspicua inconspicua. Length frequency histograms of two samples from a, Sta. 72 North America Basin and b, Sta. INCAL CP 08 West European Basin. 12-23, the latter in a large individual mm in length. The distal gill filaments lie close to the siphon and the gill axis attaches to the siphon vent
. Bulletin of the Natural History Museum Zoology. Fig. 63 Yoldiella inconspicua inconspicua. Lateral view from the right side of the internal morphology of a specimen from Sta. 72, North Atlantic Basin. (Scale = mm). For identification of the parts see Fig. Length (mm) Fig. 64 Yoldiella inconspicua inconspicua. Length frequency histograms of two samples from a, Sta. 72 North America Basin and b, Sta. INCAL CP 08 West European Basin. 12-23, the latter in a large individual mm in length. The distal gill filaments lie close to the siphon and the gill axis attaches to the siphon ventro-laterally. The labial palps are moderately large with between 12-22 ridges on the internal face. The palp proboscides are long and thin. The cerebral ganglia are large, the visceral ganglia are moderate in size and the pedal ganglia are large and elongate oval in shape. They lie more dorsal in position in the foot than in most other Yoldiella species. The foot is divided and fringed with papil- lae and has a large byssal gland in the heel. The oesophagus is distended and wide in diameter. The longitudinal plane of the stomach lies at an angle to the vertical sagittal plane, and anteriorly is displaced to the right while posteriorly it lies to the left. The stomach is large but somewhat laterally flattened. The style sac is small. The first section of the hind gut which lies within the foot is wide in section from thence it curves dorsally parallel to the posterior margin of the foot. At its dorsal limit of its course there are two small kinks to the left of the body (possibly a result of contraction in preserved specimens) before it crosses to the right side to form a single anterior loop the outline of which is characteristic of the species. The diameter of the gut appears to vary somewhat between populations, western Atlantic specimens appear to have a more slender hindgut although the dimensions fall within the overall range of eastern Atlan- tic specimens. A typhlosole i
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