. Smithsonian miscellaneous collections . ropor-tionally finer than the filaments of the distal joint of the exopodite. A diagrammatic outline of a portion of the proximal joint of oneof the epipodites is given in text figure 12, also a vertical section 372 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6j of the same; whether there were carinas on both sides of theepipodite as on the endites of Apus cancriformis is not fully deter-mined, but they are so represented on the restoration (fig. 12b). The natural side outline of the epipodite is unknown but it wasprobably not very unlike that of the up
. Smithsonian miscellaneous collections . ropor-tionally finer than the filaments of the distal joint of the exopodite. A diagrammatic outline of a portion of the proximal joint of oneof the epipodites is given in text figure 12, also a vertical section 372 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6j of the same; whether there were carinas on both sides of theepipodite as on the endites of Apus cancriformis is not fully deter-mined, but they are so represented on the restoration (fig. 12b). The natural side outline of the epipodite is unknown but it wasprobably not very unlike that of the upper one of figure 1, plate is no evidence that this specimen has been distorted by com-pression or movement within the matrix; it has been flattened toa thin film as have nearly all specimens in the Burgess shale. Comparison of exopodite and epipodite.—As already stated, theexopodite and epipodite of Neolenus have the same general form andif the filaments on the two were similar and the exopodite showed Upper margin mm* Carina. Carina Fig. 12.— (a) Diagrammatic outline of a portion of the proximal joint of theepipodite of Neolenus. (b) Vertical section of fig. 12a. traces of the presence of carinae similar to those of the epipoditethere would be no question raised as to the identity of the epipoditesshown by figures 1 and 2, plate 92, and the exopodites shown byfigure 6, plate 21, and plates 22, 23 of the 1918 paper. In additionto the epipodites being proportionally somewhat smaller and shorter,the fringing filaments of the epipodites are quite dissimilar. It hasbeen suggested that the strong filaments of the exopodite have beenbroken or pulled off from joints of the specimen, represented byfigure 1, plate 92. (See also figs. 3 and 4, pi. 20, of the 1918 paper.)A study of the fringing filaments or spines of the epipodite clearlyshows that they are inserted in the margin of the exoskeleton at thecrests of the fluted margin (text fig. 12) and that the large filaments
Size: 1482px × 1687px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
