. Fresh-water biology. Freshwater biology. Fig. 827. Ascaris microcephala. Dorsal view of head. (After von Linstow.) 64 (60) Without serrate labial plates. 65 (66) With interlabia. Magnified. 6s Ascaris helicina Molin Male 6 to 8 by to mm.; female 13 to 28 by to I mm.^ Three interlabia. Lips almost quadrangular with auricles on anterior corners. Tail of male with 5 postanal and 4 large lateral preanal papillae. Vulva an- terior, or almost in center of body. In stomach of Alligator mississippienis. Fig. 828. Ascaris helicina. Dorsal Hp, inner, aspect. X SS. Tail of male. X 85
. Fresh-water biology. Freshwater biology. Fig. 827. Ascaris microcephala. Dorsal view of head. (After von Linstow.) 64 (60) Without serrate labial plates. 65 (66) With interlabia. Magnified. 6s Ascaris helicina Molin Male 6 to 8 by to mm.; female 13 to 28 by to I mm.^ Three interlabia. Lips almost quadrangular with auricles on anterior corners. Tail of male with 5 postanal and 4 large lateral preanal papillae. Vulva an- terior, or almost in center of body. In stomach of Alligator mississippienis. Fig. 828. Ascaris helicina. Dorsal Hp, inner, aspect. X SS. Tail of male. X 85. (After von Drasche.) 66 (65) Neither interlabia nor dental plates in oral armature. Ascaris mucronata Schrank 1790. Length 52 mm., breadth mm. Body much attenuated anteriorly. Lateral membrane broad on head, disappears on neck. Greatest breadth of upper lip twice its length; base broader than anterior margin; lateral margins chvided into anterior straight and posterior arcuate portion. Tail of male with 2 rows of preanal papillae on each side. From Alligator mississippiensis. Listed by Stiles and Hassall in Leidy Collection. 67 (57) Lips distinct, not large. Male with ventral sucker near anus. Family HETERAKmAE Railliet and Henry 1914. None known from aquatic hosts. Likely to be confused with Cucullanus {of. page 530) which has a preanal sucker without horny ring. There are in North America numerous species of this 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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