Zoological Society bulletin . ?V NORMAL AND PALE PHASES OF Cambarus limosusThe pale form is really much lighter than it appears in the cut, being nearly white. Photograph by R. C. Osburn. lower Hudson would gain considerable is a possibility that they may have beendistributed accidentally among water plants,or that they have been purposely carried bysome one. At any rate there is no question butthat they have permanently adapted themselvesto the local waters. Our two local species of crayfishes may bereadily distinguished as follows: Cambarus limo-sus has a strong spine on either
Zoological Society bulletin . ?V NORMAL AND PALE PHASES OF Cambarus limosusThe pale form is really much lighter than it appears in the cut, being nearly white. Photograph by R. C. Osburn. lower Hudson would gain considerable is a possibility that they may have beendistributed accidentally among water plants,or that they have been purposely carried bysome one. At any rate there is no question butthat they have permanently adapted themselvesto the local waters. Our two local species of crayfishes may bereadily distinguished as follows: Cambarus limo-sus has a strong spine on either side of the ros-trum, or pointed projection between the eyes,while C. bartoni lias no marginal spine on therostrum. In C. limosus there is a patch of spineson either side of the carapace in the region ofthe cervical, or neck, groove, while in C. bartonithis region is only slightly granulated. Thereare various other well-marked differences instructure, form and color of the body, and espe-cially in the appendages. A distinc
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
