42 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVI. 



Family CRANGONlDiE. 



CRANGON CRANGON (Linnaeus). 



Cancer crangon Linn.eus, Syst. Nat., 10th ed., I, 1758, p. 632. 

 Crangon vulgaris Y ABRiciv^, Suppl. Entom. Syst., 1798, p. 410. 

 Crangon crangon Ortmann, Proc. Acad. Nat. Sci. Phila., 1895, p. 179 (not 

 synonymy). 



Same, Rikuoku; Jordan and Snyder; one specimen. Hakodate, 

 Hokkaido; U. S. Fish Commission steamer AlhatroKs., several speci- 

 mens. 



I have separated from ( '. craitijon of Europe the form occurring in 

 America (Atlantic and Alaskan coasts) under the name C. xepteni^pi- 

 lUMi Sa}^ on account of the antennal scale being narrower at the distal 

 end, this margin sloping backward toward the inner end, instead of 

 forward as in C. crangon; the spine of the scale is also proportionally 

 longer in C. septemspinosa., equaling or exceeding the distal width of 

 the blade, while in O. cran<j<>n the spine is usually shorter than the 

 distal width of the blade, 



Japanese specimens resemble the European rather than the Ameri- 

 can species. The scale is about two-thirds as long as the carapace 

 (rostrum excluded). The length of the palms of the chelipeds varies 

 from 2.4 to 2.8 times the width. 



CRANGON PROPINQUUS Stimpson. 



Crangon propinquus Stimpson, Proc. Acad. Nat. Sci. Phila., XII, 1860, \). 25 [94]. 



Aomori, Rikuoku; 4 specimens. 



Rostrum narrow, exceeding the eyes, slightly spatulate. Scale 

 measured on outer margin al)out five-sixths as long as carapace, exclu- 

 sive of rostrum; spine more advanced than the blade. The palms of 

 the cheltie are about 3i times as long as wide, and the distal margin 



against which the dactylus folds, is directed 

 obliciueh^ at an angle of about 45 degrees. 

 The third and fourth segments of the pleon 

 are bluntly carinate. The telson is nearly 

 as long as the carapace (rostrum excluded). 

 The sixth segment and the telson are flat- 

 tened above, and incompletely and indis- 

 tinctlv sulcate. 



CRANGON HAKODATEI, new species. 



Fig. 15.— Ckangon hakodatei; 



a, CARAPACE, X2|; d, ACICLE, xSJ; 

 C, CHELIPED, X 3i. 



Doi'sal surface pubescent, except on the 

 abdominal carina. One median gastric 

 spine. Rostrum not exceeding the eyes, gradually tapering, tip round- 

 ing. Scale (measured on outer margin) four- fifths as long as carapace, 

 exclusive of rostrum; spine projecting beyond the blade as far as the 



