. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. THE FISHES OF ALASKA. 225 Family i. HEPTATREMIDyE. The Borers, or Hagfishes. 1. Polistotrema deani Evermann & Goldsborough, new sjiecies. Head to first gill-opening in total length; depth ; tail 7; branchial distance ; gill-open- ings 11 or 12; teeth 11 + 11 and 10 + 10; base of tongue under third gOl-opening. Body long and slender, little compressed; head somewhat depressed; nostrU broad, slit-like, termi- nal; mouth a longitudinal slit with wrinkled edges; 8 barbels, 4 above and 4 below; apparently no ante- rior r
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. THE FISHES OF ALASKA. 225 Family i. HEPTATREMIDyE. The Borers, or Hagfishes. 1. Polistotrema deani Evermann & Goldsborough, new sjiecies. Head to first gill-opening in total length; depth ; tail 7; branchial distance ; gill-open- ings 11 or 12; teeth 11 + 11 and 10 + 10; base of tongue under third gOl-opening. Body long and slender, little compressed; head somewhat depressed; nostrU broad, slit-like, termi- nal; mouth a longitudinal slit with wrinkled edges; 8 barbels, 4 above and 4 below; apparently no ante- rior rudimentary gill-slits. Fin-fold well pronounced on ventral surface of body, gi'adually disappear- ing in front of middle of length; caudal rounded, showing ray-like marks. Color purpliiih-blue or that of the Santa Clara prune, becoming blacker in alcohol, and uniform over the whole body; ventral fold or anal fin not bordered by white; no white border about gill-openings. This species differs fi'ora Polistotrema stouli in a ninnber of important respects, chief of which are the much shorter head ( instead of in body), the longer tail (7 instead of 8), the more numerous. Fig. 1.—Polistotrema deani Evermann & Goldsborough, new species. Type. teeth, and the color. In P. stouti the ground color of fresh specimens" was brown plus a little pink, which changes to a bluish tint in preserved specimens; ventral fold or anal fin bordered by white, which often encircles the caudal fin; gill-openings bordered by white ring; old examples often mottled or blotched about the head with white; a few specimens had in addition 1 or 2 l)lack blotches on the side uf the body. In the following table are given certain comparative measirrements of 97 examples of P. stouti,a and con-esponding measurements of our 4 specimens of P. deani. All measurements, etc., were taken from the right side of fresh hags that had just died. The specimens were laid flat on a board, but none was stretched.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
