. Fresh-water rhizopods of North America [microform]. Rhizopoda; Fresh-water fauna; Rhizopodes; Faune d'eau douce. Hi I i n 4:ii-> 144 FRKSIi-WATKU KHIZ()l'()J)8 OF NOKTH QiMdrula aymmvMca. Oppositn nidi's of tlio sumo shell. Besides fij^s. 20-2r), pi. XXIV, the ncconiiinnying figures, in tlio arrangement of the plates of the shell, represent the more important varieties wliioh I luivo observed. The size of the sliell ranges from about the .Jjh to the ,[^tli of an inch in length by J,A]i to :^^th of an inch broad. The sarccde is colorless, and in all its characters resembles that
. Fresh-water rhizopods of North America [microform]. Rhizopoda; Fresh-water fauna; Rhizopodes; Faune d'eau douce. Hi I i n 4:ii-> 144 FRKSIi-WATKU KHIZ()l'()J)8 OF NOKTH QiMdrula aymmvMca. Oppositn nidi's of tlio sumo shell. Besides fij^s. 20-2r), pi. XXIV, the ncconiiinnying figures, in tlio arrangement of the plates of the shell, represent the more important varieties wliioh I luivo observed. The size of the sliell ranges from about the .Jjh to the ,[^tli of an inch in length by J,A]i to :^^th of an inch broad. The sarccde is colorless, and in all its characters resembles that of Ilyalosphenia. The food-vacuoles often aj)pear yellowish. The nu- cleus when visible measures about the jJ^th of an inch or more. I'ho pseudopods are digitate and usu- ally two or three in number. In several instances I have found specimens, late in the season, with the sarcode in a quiescent or encysted condition. Fig. 25 represents such ii specimen obtained from sphagnum in November. It was of the largest size, about the j^.th of an inch in length. The plates were arranged ob- liquely across the shell, and were pretty uniform in size. The neck was occupied by a laminated diaphragm as thick as one third the length of the shell. The sarcode mass formed a compressed oval ball occujiying a cen- tral iiosition in the body of the latter The ball was nearly colorless or faintly yellowish, and granular, and contained several large oil-like glob- ules. A central clearer space appeared to indicate the presence of a nucleus. Dead shells are sometimes found containing in the interior a number of scattered plates, or the same in one or m /re little ppokets, like those composing the wall of the shell. QuadruJa symmetrica was first described by Dr. Wallich, under the name of Difflugia symmetrica^ from specimens found in England. It was more recently described, and referred to a new genus, by Prof. Schulze, from specimens found near Dresden. Ehrenberg described the same as pertaining to t
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1879
