. Fresh-water biology. Freshwater biology. S>.l MM Fig. 1159. w4/0»e//a j£n/;/£ra, with dsveloping epbippium. 234 (231) No infero-posteal teeth; form rotund. Alonella glohulosa Daday 1898. Small; shape oval-rotund; head reaching about to middle of valves. Valves striated; all margins rounded and without teeth. Post-abdomen long, narrow; broadest near anus; about 12 minute marginal denticles and as many slender lateral fascicles. Keel of labrum with 2 notches. Color yellow-brown. Length, $, mm. Lake Charles, Louisiana, among weeds. This species is A. sculpta Sars. Fig. 1160. Alonell
. Fresh-water biology. Freshwater biology. S>.l MM Fig. 1159. w4/0»e//a j£n/;/£ra, with dsveloping epbippium. 234 (231) No infero-posteal teeth; form rotund. Alonella glohulosa Daday 1898. Small; shape oval-rotund; head reaching about to middle of valves. Valves striated; all margins rounded and without teeth. Post-abdomen long, narrow; broadest near anus; about 12 minute marginal denticles and as many slender lateral fascicles. Keel of labrum with 2 notches. Color yellow-brown. Length, $, mm. Lake Charles, Louisiana, among weeds. This species is A. sculpta Sars. Fig. 1160. Alonella 23 s (230) Post-abdomen with marginal denticles only 236 236 (237) Denticles minute; post-abdomen large, bent behind anus; no in- fero-posteal tooth on valves. Alonella diaphana (King) 1853. Head short, rostrum not reach- ing more than two-thirds distance toward ventral margin. Valves striated, sometimes passing into reticulation, often inconspicuous; infero-posteal angle rounded, with- out teeth. Post-abdomen long, sHghtly enlarged behind anus; with nmnerous very minute marginal denticles and no other spines. Claws long; I basal spine. Length, V, mm.; J, mm. Color yellow, transparent. Louisiana, Texas; in pools and iakes; rare. Fig. 1161. Alonella 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. ]
Size: 1998px × 1250px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
