332 THE ANIMAL. PARASITES OF MAN 



The dorsal ray is divided to its base, its two branches are 

 prominently divergent and their tips are bipartite instead of 

 tridigitate as in U. duodenalis. The common base of the dorsal 

 and dorso-lateral rays is very short. 



In the female the vulva is in the anterior part of the body, 

 but near the equator. 



The eggs are larger than in U. duodenalis, they measure 

 64 75 fju in length by 36 40 /* in breadth. 



So far, Uncinaria ' 'Americana has been found only Jn man, its 

 anatomical habitat is the small intestine. Its distribution, so far 

 as determined, includes Virginia, North and South Carolina, Georgia, 

 Florida, Alabama, Texas, Porto Rico, Cuba and Brazil. 



The life history of U. Americana has not yet been investigated, 

 but there is no reason for assuming that it will differ radically 

 from that of U. duodenalis. L. W. S.] 



LITERATURE. 



DUBINI, A. Nuov. verm. int. umano. (Ann. univ. med. d'Omodei., 1843, cvi., p. 5.) 

 SIEBOLD, C. Th. v. Ein Beitr. z. Helminthogr. hum. (Z. f. w. Z., 1852, iv., p. 55.) 

 GRIESINGER. Klin. u. an. Beob. iib. d. Krankh. v. Aeg. (Arch. f. phys., Hlkde., 



1854, xiii., p. 55.) 

 PARONA, C., and GRASSI, B. Sull. svil. dell' Anchil. duod. (Atti soc. ital. sc. 



nat., 1878, xxi., p. 53.) 

 PERRONCITO, E. Helm. Beob. (Molleschotts Unters. z. Naturl. d. Mensch., xii., 



P- 532.) 

 BUGNION, E. L'ankylost. duod. et 1'anemie du St. Gotthard. (Rev. med. Suisse 



romande, Geneve, 1881, Nos. 5 and 7.) 



SCHULTHESS, W. Beitr. z. An. v. Anc. duod. (Z. f. \v. Z., 1882, xxxvii., p. 163. 

 MENCHE. Anchyl. duod. b. d. Ziegelbrenner- Anaemic i. Dtschld. (Ctrlbl. f. klin. 



Med., 1882, p. 161, and Ztschr. f. klin. Med., 1883, vi., p. 161.) 

 PERRONCITO, E. L'anem. d. mineurs au point de vue parasitol. (Arch. ital. de 



biol., 1882, ii., p. 315 ; 1883, iii., p. 7.) 

 GRASSI, B. Anchilostomi ed Anguillule. (Gaz. d. ospit., 1882, No. 41 ; Giorn. 



R. Ace. med. Torino, 1883, xxxi., p. 119.) 

 LUTZ, A. Ueb. Anc. duod. (Volkmann's Sammlg. kl. Vortr., 1888, Nos. 255, 



256 and 265.) 

 LEICHTENSTERN, O. Ueb. Ancyl. duod. b. d. Ziegelarb. i. d. Umgeb. Coins 



(Dtsch. med. Wchsch., 1885, xii., Nos. 28-30. Weit. Beitr. z. Ancylostomen. 



frage. (Ibid., 1886, xii., Nos. 1114.) 



Fiitterungsvers. mit Ancyl. -Larven. (Ctrlbl. f. klin. Med., 1886, No. 39.) 

 Einig. iiber Anc. duod. (Ibid., 1887, xiii., Nos. 26 32.) 

 CHIARI, H. Ueb. einen in Prag secirt. Fall v. Ancylostomiasis bei einem Kruneger 



(Prag. med. Wchschr., 1893, No. 44.) 

 Looss, A. Not. z. Helm. Aeg. i. (C. f. B., P. u. I. 1896 [i], xx., p. 865. ii. Ibid., 



1897, xxi., p. 913.) 



Z. Lebensgesch. d. Ancyl. duod. (Ibid., 1898, xxiv., p. 484.) 

 ZINN, W., and M. JACOBY. Ancyl. duod., Lpzg., 1898. 

 Looss, A. Ueb. d. Eindr. d. Ancyl.-Larv. in d. menschl., Haut. (C. f. B., P. u. 



I. 1901 [i], xxix., p. 733.) 

 STILES, CH. WARDELL. Report upon the prevalence and geographical distribution of 



Hook-worm disease in the United States. Washington, 1903.: 



Gen. ii. Physaloptera, Rud., 1819. 



Mouth surrounded by two even lips usually situated at the sides, and 

 each provided with three papillae and teeth. The posterior extremity of 



