. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 256 Bulletin Museum of Comparative Zoology, Vol. 145, No. 5 M. turnerae Sta. S-65 M. yongei Sta. 200. HEIGHT (mm) Figure 21. Size/frequency histogram of one sample each of Microgloma yongei and M. turnerae. proboscides are proportionately shorter. In Microgloma the palp does not lie as close to the mantle edge as in Pristigloma and the palp proboscides are relatively longer than in the latter genus. Because food is not plentiful and much is refractile (Sanders and Hessler, 1969), and probably difficult to dige
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 256 Bulletin Museum of Comparative Zoology, Vol. 145, No. 5 M. turnerae Sta. S-65 M. yongei Sta. 200. HEIGHT (mm) Figure 21. Size/frequency histogram of one sample each of Microgloma yongei and M. turnerae. proboscides are proportionately shorter. In Microgloma the palp does not lie as close to the mantle edge as in Pristigloma and the palp proboscides are relatively longer than in the latter genus. Because food is not plentiful and much is refractile (Sanders and Hessler, 1969), and probably difficult to digest, the gut of deej)-sea protobranchs, and of the Pristi- glomidae in particular, is modified. Thus, while the stomach is similar in design to that of shallow-water protobranchs (Yonge, 1959; Pmchon, 1956), in Pristigloma alba and Microgloma sorting ridges are only two or three in number and these are not very pronounced. However, the stomach remains relatively large, as does the style sac, and together they take up most of the available body space. The hindgut in shallow-water species such as Nuctilana forms a single loop on the right-hand side of the stomach. In deep-sea species the hindgut is extended and, as such, poses a problem in the dispo- sition of an elongate tube. Many different arrangements have been evolved, as will be apparent from future publications. In Pristigloma the hindgut is looped to the right and left of the stomach, the loops being carried from one side to the other be- hind the stomach. In contiast, in Micro- gloma there are three coils around the top of the stomach in a horizontal plane and also an additional loop on each side. In all protobranchs the final straight section of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambrid
Size: 1419px × 1761px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
