I [AGCHYLOSTOMA " Dubini, 1843.] 
1 Diagnosis. — r^K'iitarla: Provided with ventral recurved teeth. 
Type species. — Agchn/osfom(( dnodeitaJr Duhini, 1S4.‘>. 
i 
The Old World hookworm — AGCHYLOSTOMA DTJODENALE Dubini. 1843, or UNCINARIA 
DTJODENALIS ( Dubini i Railliet, 1885 — of man. 
(Figures 10 to 41.) 
Specific Diagnosis. — Agchylostoma: Body cylindrical, somewhat attenuated ante- 
riorly. Buccal cavity with two pairs of ventral teeth curved like hooks, and one 
pair of dorsal teeth directed forward; dorsal rib not projectinj^ into the cavity. 
Male, 8 to 11 mm. long; caudal bursa with dorso-median lobe, and prominent lateral 
lobes united by a ventral lobe; for rays, see tig. 14; dorsal ray divides at a iK)int 
two-thirds its length from its base, each branch being tridigitate; spicules long and 
slender. Female, 10 to 18 mm. long; vulva at or near posterior third of body. Eggs, 
ellipsoid, 52 to 60 // by 32 /<, laid in segmentation. Develoiiment direct without inter- 
mediate host. 
There are numerous ways of spelling this word (.see p. 15), more than one with 
more or less philological authority. Under these circumstances I ado])t the original 
orthography, despite the fact that it is not philologically correct. By this action I 
do not intend to necessarily reject the ruling covered by the International Code, hut 
from practical experience I find it impracticable to carry out said rule in reference 
to the emendation of names until the question of homonyms is decide^!. 
^Synonymy, with Original Pl.vce of Pphlic-vtion. 
1843: Agchylostoma duodenale Dubini <Ann. univer. di mod., Milano, y. 106, aprile, 
pp. 5-13, pi. 1, tigs. 1-5; pi. 2, ligs. 1-3. 
1845: Ancylostoma duodemde (Dubini) Ckeplin <Arcli. f. Xaturg., Berk, 11. J., v. 1, 
p. 325. 
(1846): Anchyloftloma duodemde (Dubini) Delle Ciii.v.ie <Rendicon. dell’ .\ccad. 
dellesci., Napoli, v. 5, p. 339. [Not verilie<l.] 
1850: AnchyloHt(jm(i duodenale (Dubini) Dubini, Ento/.oogralia umana, pp. 10.3-112. 
1851: AnchyloKtomnui duodenale' {Dnhini) Diesing, Sy.stema hehninthum, v. 2, p. .322. 
?(1851) : Strongylua (yeod/vcfc/ih/hLS Siebold <Naturforsch. Versamml. /. (iotha. [Not 
verifieil.] 
1861: JJorhiniu.'i ancliyloHiomum Molin, 11 sottordine degli acrofalli <^Mem. r. 1st. 
veil, di sc., lett. ed arti, Venezia, v. 9, ]>j>. 485-487. 
1864: Sderontoma duodetude (Dubini) Cobbold, Entozoa, pp. 361-3(>2, tig. 77. 
1866: Strougyliiif duodemdiii Schneider, Monographic der Nemat<Mlen, Berk, 
pp. 139-140, 1 fig., pk 9, fig. 3. 
1866: Ancylostouium duodemde Dubini” of White <[Bost(»n M. A S. J., v. 7o i21 i, 
Dec. 20, p. 427. [Misprint for duodeutdr.] 
1876: DodmuuH duodeiudk (Dubini) Eeuckart, Die men.<chlichen I’arasiten, v. 2 (3), 
pp. 410-460, figs. 235-239, 241-247, 249. 
1879: A)ichdodoiua duodnude (Dubini) Bozzoi.o <( li^servatori', Torino, v. b> (24 i, 
17 giugno, i>p. 369-370. 
1881: Donuius duodenalls med. <h* la Suis.'Je Uoin., < Icneve, v. 1 (3), 1.) mars, 
p. 190. 
1885: (urinaria duodrnalls (Dubini) U.mi.lict, Elements tic zook mctl. et agric., I ar., 
pp. 357-359, tigs. 245-24S. 
1897: .inch ylosla muni duodenale (Dubini) iM<kiil,\u <[Buffali4 M. •!., v. 36 iS:, .Mar., 
j)p. 573-579. [Misjirint for Anrhylostomuin duodemde.^ 
Aukylostoma duodenale ami nkylostom um duodenah ol various aiithtirs. 
