. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 43. Pseudotindaria championi (Clarke). Lat- eral view of the course of the hind gut as seen from the right side. Stippled sections are positioned on the left side of body, blacked sections on the right. f the anterior adductor muscle. The adduc- tor muscles are oval, equal in size, with the 'quick' and 'catch' portions clearly seen. The 2;ills are horizontal, each with 10 or 11 pairs of plates. The gill axis extends be)'ond the posterior plates to fuse with the siphonal tissue at the junction of incurrent and e
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 43. Pseudotindaria championi (Clarke). Lat- eral view of the course of the hind gut as seen from the right side. Stippled sections are positioned on the left side of body, blacked sections on the right. f the anterior adductor muscle. The adduc- tor muscles are oval, equal in size, with the 'quick' and 'catch' portions clearly seen. The 2;ills are horizontal, each with 10 or 11 pairs of plates. The gill axis extends be)'ond the posterior plates to fuse with the siphonal tissue at the junction of incurrent and excurrent channels, and as in T. erebus there is no fusion between gill and mantle, body or opposite gill. It seems likely that I as in other protobranchs, tlie posterior limits â of tlie gill axes act as guide rails to facili- tate the removal of bulky faecal rods. The palps are moderately large and extend from the mouth partly across the foot; the dorsal limit of the ridged area is attached to the body in front of the junction of the anterior edge of the muscular part of the foot to the viscera. The many ridges (approximately 25) spread fanwise, posteriorly. The re- tracted palp proboscides do not extend be- yond the posterior margin of the foot. The foot is dorso-venti'ally elongate, the sole is not exceptionally large, the tip is pointed, with the fringing papillae moderately small, rounded and low crowned. The heel is pro- duced as a small, short process with a mod- erately large 'byssal' gland, similar to that described for P. erebus. The gut is also similar to that of P. erebus (Fig. 42), with tlie hindgut arranged in the same con- figuration. However, the relative diameter. Figure 44. 'Tindaria' acinula Dall. Internal views of the left and right valves. of the hind gut is greater in P. championi, in which the gut occupies much more of the body space (Figs. 32, 42). DISTRIBUTION PATTERNS Of the six species considered in this paper, four members of the genus Tindaria and
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