. Fresh-water biology. Freshwater biology. 702 FRESH-WATER BIOLOGY 59 (58) Fornices of ordinary form; eye large 60 60 (61) Head inflated in front of antennules. Small form not exceeding mm Ceriodaphnia pulchella Sars 1862. Form of ordinary type. Head rounded in front; inflated in region behind eye, angulated in front of antennules. Valves retic- ulated but not plainly so. Post-abdomen not sinuate above anal spines, which number 7-10. Length, 9, mm.; d', mm. Found among weeds and limnetic in lakes and in pools; reported from all regions. Forms agreeing perfectly with this descri
. Fresh-water biology. Freshwater biology. 702 FRESH-WATER BIOLOGY 59 (58) Fornices of ordinary form; eye large 60 60 (61) Head inflated in front of antennules. Small form not exceeding mm Ceriodaphnia pulchella Sars 1862. Form of ordinary type. Head rounded in front; inflated in region behind eye, angulated in front of antennules. Valves retic- ulated but not plainly so. Post-abdomen not sinuate above anal spines, which number 7-10. Length, 9, mm.; d', mm. Found among weeds and limnetic in lakes and in pools; reported from all regions. Forms agreeing perfectly with this description may be found, as also quadrangula forms, but other varieties occur which are difficult to assign to either species, but which so closely agree with them as to render it impossible to make a new species Fig. 1084 Ceriodaphnia for them. pulchella, 61 (60) Head angulated but not inflated in front of antennules. Length to mm. . Ceriodaphnia quadrangula (O. F. Miiller) General form like reticulala. Valves reticulated, often not plainly marked. Antennules with lateral sense-hair near apex. Post-abdomen narrowing toward apex, often, but not always, sinuate above anal spines; these number 7-9. Claws large, denticulate. $ antennules with long flagellum, hook-hke at tip. Color transparent to pinkish opaque. Length, ?, to mm.; J, to mm. Common in all regions; found both among weeds and limnetic. C scilula Herrick seems to be a large variety of this species. q I 1^114,. 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
