. Bulletin of the Natural History Museum Zoology. 18 ALLEN, SANDERS AND F. HANNAH Table 1 Yoldiella lucida; numbers of anterior and posterior hinge teeth in specimens from different localities. Biscay North Atlantic 'Thor' N. European Length Teeth No. USNM. Length Teeth No. Length Teeth No. (mm) Ant. Post. No. (mm) Ant. Post (mm) Ant. Post. INCAL DS 02 6 6 738419 8 8 8 7 INCAL DS 01 7 7 159718 10 10 8 9 INCAL DS 01 7 7 74517 11 10 9 9 INCAL DS 01 8 8 202847 11 11 9 9 INCAL CP 01 9 9 202847 11 11 9 10 INCAL DS
. Bulletin of the Natural History Museum Zoology. 18 ALLEN, SANDERS AND F. HANNAH Table 1 Yoldiella lucida; numbers of anterior and posterior hinge teeth in specimens from different localities. Biscay North Atlantic 'Thor' N. European Length Teeth No. USNM. Length Teeth No. Length Teeth No. (mm) Ant. Post. No. (mm) Ant. Post (mm) Ant. Post. INCAL DS 02 6 6 738419 8 8 8 7 INCAL DS 01 7 7 159718 10 10 8 9 INCAL DS 01 7 7 74517 11 10 9 9 INCAL DS 01 8 8 202847 11 11 9 9 INCAL CP 01 9 9 202847 11 11 9 10 INCAL DS 01 8 8 202847 11 10 11 11 INCAL CP 01 8 8 202847 12 12 12 12 INCAL DS 02 9 9 202847 11 11 11 11 POLYGAS DS26 11 11 73172 12 12 11 12 INCAL DS 01 10 10 202847 12 14 14 14 INCAL DS 01 10 10 202847 15 14 13 11 11 13 12 13 14 12 12 13 11 13 Very similar to Y. lucida (for points of difference see p. 19), past records (Verrill & Bush, 1898; Waren, 1989) testify to this. Internal morphology (Fig. 10). The internal morphology is similar to that of Y. lucida. There is a well-developed ciliated anterior mantle sense organ. The inhalent and exhal- ent siphons are combined for most of their length, and the inhalent siphon is not fused along its ventral margin. The siphonal tentacle is well-developed and usually attached to the left of the base of the siphons. The feeding aperture is. Fig. 9 Yoldiella obesa obesa. Lateral views of shells from the right side to show change in shape with increasing size and detail of hinge plate. Specimens from Sta. 62 North America Basin. Note adductor muscles and hind gut loop seen through the transparent shell. (Scale = mm). also well-developed and provided with numerous gland cells. The broad and, in preserved specimens, convoluted part of the inner muscular lobe which forms the feeding aperture, extends anteriorly beyond the lim
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