. Bulletin of the Natural History Museum Zoology. . Fig. 25. Tindariopsis agatheda. External lateral views of right side of two specimens of differing size to show change in shape with growth, a, from Knorr station 301 and b, from Knorr station 293, both from the Guyana Basin; c, external dorsal view of a shell also from station 293. Scale = 1mm. Table 1. Measurements and ratios of shell parameters of the sample from Knorr sta. 293. Length (L) Height (H) Post-umbonal (PL) PL/L H/L (mm) (mm) length (mm) 0.
. Bulletin of the Natural History Museum Zoology. . Fig. 25. Tindariopsis agatheda. External lateral views of right side of two specimens of differing size to show change in shape with growth, a, from Knorr station 301 and b, from Knorr station 293, both from the Guyana Basin; c, external dorsal view of a shell also from station 293. Scale = 1mm. Table 1. Measurements and ratios of shell parameters of the sample from Knorr sta. 293. Length (L) Height (H) Post-umbonal (PL) PL/L H/L (mm) (mm) length (mm) Internal morphology () The siphonal embayment is shallow and dorso-ventrally narrow. In contrast, the feeding aperture is broad and well-supplied with radial pallial muscles. The adductor muscles are small, the posterior muscle is oval and the anterior muscle is circular in cross section. The foot is large with a well-developed heel containing a large 'byssal' gland. The gland opens into the posterior limit of the pedal groove via a small papilla. The anterior two-thirds of the margins of the divided sole are broadly papillate. The palps are large with up to 25 ridges in the largest specimens. The gills are narrow ill-defined with about 16 plates in the largest specimens. The mouth lies close to the posterior face of the anterior adduc- tor muscle. The oesophagus opens into a large stomach and style sac. The hind gut passes posterior to the style sac and stomach to the dorsal side of the viscera and thence across the right side of the body where it forms 8 coils before returning along the same path to the dorsal side of the viscera and from there through the heart and then dorsal to the posterior adductor muscle to the
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Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
