. Bulletin - United States National Museum. Science. 66 BULLETIN 189, UNITED STATES NATIONAL MUSEUM Color grayish, the disk with scattered dark specks; plain pale underneath. This species is related to U. peruanus, with which it agrees rather well in shape, though the tail is a little longer. It differs, further, in the absence of spines and prickles on the disk; in the wider, distally rounded caudal fin; and in the absence of cusps on the teeth. It differs from U. aspidurus (Jordan and Gilbert) in having a shorter tail (longer than disk in aspidurus); in the notably less strongly exserted sno
. Bulletin - United States National Museum. Science. 66 BULLETIN 189, UNITED STATES NATIONAL MUSEUM Color grayish, the disk with scattered dark specks; plain pale underneath. This species is related to U. peruanus, with which it agrees rather well in shape, though the tail is a little longer. It differs, further, in the absence of spines and prickles on the disk; in the wider, distally rounded caudal fin; and in the absence of cusps on the teeth. It differs from U. aspidurus (Jordan and Gilbert) in having a shorter tail (longer than disk in aspidurus); in the notably less strongly exserted snout; the larger eye (about in snout in aspidurus); and f. Figure 13.—Uroirygon serrula, new species. From the type, 187 mm. long, Lobos de Tierra Bay, Peru ( No. 127795). Insert, diagram of outline of snout and position of mouth and nostrils. in the notably differently shaped ventral fin, which has a nearly straight distal margin with the outer (lateral) part somewhat produced (about in length anterior to axil of pectoral in aspidurus). From U. chilensis (Giinther), according to the description and figure, it differs in the narrower disk (1,57 in total length in chilensis); and the tail is shorter, although it is described as longer than the disk in chilensis, and it seems to bear a broader and more broadly rounded caudal fin. It differs from the type of U. goodei (Jordan and Bollman) in the dif-. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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