. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 46 Bulletin Museum of Comparative Zoology, Vol. 148, No. 2. Figure 31. Pseudotindaria erebus (Clarke), outline; C, dorsal view of entire shell. A, anterior view of shell in outline; B, dorsal view of valve In not particularly well-developed. There is no great concentration of gland cells inter- nal to the feeding aperture; although there are small mucous cells lining the main man- tle rejectory ti'act leading to this area. The gills are more or less horizontal with 14 to 16 plates on each side of the axis, the plates
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 46 Bulletin Museum of Comparative Zoology, Vol. 148, No. 2. Figure 31. Pseudotindaria erebus (Clarke), outline; C, dorsal view of entire shell. A, anterior view of shell in outline; B, dorsal view of valve In not particularly well-developed. There is no great concentration of gland cells inter- nal to the feeding aperture; although there are small mucous cells lining the main man- tle rejectory ti'act leading to this area. The gills are more or less horizontal with 14 to 16 plates on each side of the axis, the plates on either side alternating. The gill plates are approximately equal in size, those of the inner demibranch slightly larger than those of the outer, particularly posterior to the body; each has a fan of three muscles in die transverse plane which pene- trate the axis as a retractor muscle, and on either side of the retractor muscle are longitudinal muscles running the length of the axis (Fig. 34). There is no tissue fusion to the mantle and/or the body opposite to form a diaphragm because the separation of the hypobranchial cavity from the re- mainder of the mantle cavity is accom- plished by ciliary junctions. Note that the cerebro-visceral connectives lie close to the junction of the gill axis with the body. The palps are relatively larger than those of Tindaria with many more ridges (17 to 30). The mouth is close to the anterior ad- ductor muscle and the palps extend more than half way across the body. The palp proboscides are relatively large. The foot is moderately large widi a well-defined neck; the fringing papillae and heel are very small. A large 'byssal' gland is present, the hyaline central portion of which is elongate, cylindrical and different in shape from any of those described to date (Sanders and Allen, 1973; Allen and Sanders, 1973) (Fig. 35). As in other genera, there is a centi'al sagittal strip of tissue dividing tlie gland in half, the gland opening just po
Size: 1905px × 1311px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
