. Bulletin. Natural history; Natuurlijke historie. Fig. 10, at left. Pentlandia macropterus. Por- tion of skull roof in dorsal view. Specimen L 10905, Manchester Museum. Redrawn from Watson and Day (1916) with new dermal bone notations. Fig. 11, at right. Scaumenacia curta. Portion of skull roof in dorsal view. Unnumbered specimen, Dartmouth College. Redrawn after Westoll (1949) with new dermal bone nota- tions. Phaneropleuron. As pointed out by Westoll (1949, p. 147), this genus has much in common with Scaumenacia. Our interpretation is given in Figures 12A and 12B. There is no reason to doub
. Bulletin. Natural history; Natuurlijke historie. Fig. 10, at left. Pentlandia macropterus. Por- tion of skull roof in dorsal view. Specimen L 10905, Manchester Museum. Redrawn from Watson and Day (1916) with new dermal bone notations. Fig. 11, at right. Scaumenacia curta. Portion of skull roof in dorsal view. Unnumbered specimen, Dartmouth College. Redrawn after Westoll (1949) with new dermal bone nota- tions. Phaneropleuron. As pointed out by Westoll (1949, p. 147), this genus has much in common with Scaumenacia. Our interpretation is given in Figures 12A and 12B. There is no reason to doubt the accuracy of Westoll's identification of bone K, except perhaps in his figure 7E where it may be an X; but without knowledge of the position of the lateral-line canals no decision can be reached on this specimen. The large elements anterior to X or K obviously belong to the L series, but we cannot determine if L^ has captured the space occupied by Lg in earlier forms, or vice versa. They are therefore simply labelled L. Rhinodipterus. It is probable that two different types have been assigned to this genus, R. ulrichi 0rvig (Fig. 13A) from the late Middle Devonian which lacks the bone D, and R. secans Gross (Fig. 13B) from the early Late Devonian in which D is well developed. The lateral-line series of R. ulrichi is known from the type speci- men (0rvig, 1961, fig. 8); contrary to 0rvig's interpretation it is evident that K has already disappeared. A pit line runs from B through J to X indicating a situa- tion in this region similar to that of Scaumenacia rather than that of Dipterus. On the other hand. White (1962, figs. 1-2) figures a specimen of R. secans in which. 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 Peabody Museum of Natural History. New Haven : The Museum
Size: 1540px × 1622px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
