. Fresh-water biology. Freshwater biology. ffSn- Somites strictly five-ringed, none of the annuli obviously enlarged or subdivided. Eyes three pairs, the first largest; genital pores separated by two aimuli; atrial cornua simply curved; vasa deferentia reaching forward to ganglion XI. Herpobdella punctata (Leidy) 1870. The largest, best known and most widely distributed member of the family in North America. The color varies considerably according to the amount of black pigment present. A very active leech which feeds voraciously on small worms, other leeches, and aquatic insect larvae. It wil
. Fresh-water biology. Freshwater biology. ffSn- Somites strictly five-ringed, none of the annuli obviously enlarged or subdivided. Eyes three pairs, the first largest; genital pores separated by two aimuli; atrial cornua simply curved; vasa deferentia reaching forward to ganglion XI. Herpobdella punctata (Leidy) 1870. The largest, best known and most widely distributed member of the family in North America. The color varies considerably according to the amount of black pigment present. A very active leech which feeds voraciously on small worms, other leeches, and aquatic insect larvae. It will take human blood when opportunity offers. Egg capsules found abundantly attached to stones, etc. Fig. 1008. Eerpobdella punctata. Atrium and neighboring parts of reproductive organs, ai, atrium; de, ductus ejaculatorius; gXI, ganglion XI: 9, female orifice; of, fundus of ovary; <w, ovary; p, atrial horn. X 7j. (After Moore.) S6 (s5) Annulus h obviously enlarged and subdivided 57 57 (58) Atrial cornua spirally coiled, vasa deferentia with anterior loops reaching to ganglion XI; eyes four pairs; genital orifices separated by two annuli; colors plain or irregularly blotched. Nephelopsis obscura VerriU 1827. Fig. 1009. Nephelopsis ehscura. DorsaJ and lateral aspects of atrial region. X 3. (Original.). 58 (57) Atrial cornua not spirally coiled, but short and merely curved. Dina R. Blanchard 1892 . 59 59 (62) Vasa deferentia i^ith anterior loops reaching to ganglion XI. 60 60 (6i) No pigmented eyes; genital pores separated by two annuli; longi- tudinally striped. California. DinaanoculataMooieiSgS. 61 (60) Eyes four pairs; genital pores separated by three to three and one- half annuli; nearly pigmentless. Dina parva Moore 1912. 62 (59) Vasa deferentia not extending anterior to atrium 63 63 (64) Eyes, three pairs; genital pores separated by three annuli; atrial cornua very small; pigment nearly absent. Dina microstoma Moore 1901,. Please note that these images are extracted from
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
