. A guide to the study of fishes. Fishes; Zoology; Fishes. 2o6 The Scyphophori, Haplomi, and Xenomi to account for its wide distribution in the rivers of the southern hemisphere. Neochanna is an ally of Galaxias living in burrows in the clay or mud like a crayfish, often at a distance from water. As in various other mud-living types, the ventral fins are obsolete. Order Xenomi. — We must place near the Haplomi the singular group of Xenomi {Sevos, strange; S/ao?, shoulder), regarded by Dr. Gill as a distinct order. Externally these fish much resemble the mud-minnows, differing mainly in the ver
. A guide to the study of fishes. Fishes; Zoology; Fishes. 2o6 The Scyphophori, Haplomi, and Xenomi to account for its wide distribution in the rivers of the southern hemisphere. Neochanna is an ally of Galaxias living in burrows in the clay or mud like a crayfish, often at a distance from water. As in various other mud-living types, the ventral fins are obsolete. Order Xenomi. — We must place near the Haplomi the singular group of Xenomi {Sevos, strange; S/ao?, shoulder), regarded by Dr. Gill as a distinct order. Externally these fish much resemble the mud-minnows, differing mainly in the very broad pectorals. But the skeleton is thin and papery, the two coracoids forming a single cartilaginous plate imperfectly divided. The pectorals are attached directly to this without the inter- vention of actinosts, but in the distal third, according to Dr. Charles H. Gilbert, the coracoid plate begins to break up. Fig. 164.—Alaska Blackfish, Dallia pectoralis (Bean). St. Michaels, Alaska. into a fringe of narrow cartilaginous strips. These about equal the very large number (33 to 36) of pectoral rays, the basal part of each ray being slightly forked to receive the tip of the cartilaginous strip. " In the deep-sea eels of the order Heteromi there is a some- what similar condition of the coracoid elements inasmuch as the hypercoracoid and hypocoracoid though present are merely membranous elements surrounded by cartilage and the acti- nosts are greatly reduced. It seems probable that we are dealing in the two cases with independent degeneration of the shoulder-girdle and that the two groups {Xenomi and Heteromi) are not really ; (Gilbert.) Of the single family Dalliidce, one species is known, the Alaska blackfish, Dallia 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 Jordan
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