56 
From this table we may classifv the 18 cases as follows: 
By species of parasite: Gordius aquaticus, 1 cases; Paragordius 
varius^ 1 cases; P. tricuspidadus. 1 case: P. cmctus, 1 case; Parachor- 
dodes tolosanus. 3 cases: P. pv.stidosus. 1 case; P. idoJaceus, 1 case; 
P. odpestris, 1 case; not stated. 2 cases. 
By countries: Europe — Austria. 1 case: France. 5 cases; Germany, 
1 case: Italy, 1 cases. North America — 6 cases (1 each for Canada. 
Illinois, Ohio, Maine, Maryland, and Michigan). Africa — Transvaal, 
1 case. 
By sex of patient: Male, 9 cases; female, 1 cases: not stated, 5 
cases. 
By age of patient: 0 to 10 years. 3 cases: 11 to 20 }"ears, 2 cases; 
21 to 30 years. 1 case: 31 to 10 years. 2 cases: 11 to 50 years, 2 cases; 
not stated. 8 cases (2 of which were apparently adults). Or — 0 to 20 
years. 5 cases: 21 to 1<) years. 3 cases: 11 to 60 years. 2 cases: not 
stated. 8 cases. Kirtland's case (’*a girl") can probably be counted 
under 21 years, thus giving 6 cases from 0-20. 
The parasites escaped: By mouth in 9 cases: by anus. 5 cases; not 
stated. 1 cases. 
Referring to the classification of the parasites it may be noted that 
the family Gordiidsi is divided by Camerano (1898g) into the four 
genera: • Parachordodes, Poragordiv.s, and Gordius, but 
^lontgomery (1898) unites Parachordodes with Gordius. These 
genera may be distinguished by the following key, based upon the 
diagnoses given bv Camerano. 
KEY TO THE GEXERA OF GORDIID.E. 
(For forms known to occur in man in the United States, follow Roman type.) 
1. Ffncf o f tail not lobed 2 
End of tail bilobed 4 
End of tail trilobed Paragordius varius (female) 
2. Cloacal aperture ventro-median, with rentro-median groore extending from it to 
tip of tail Chordodes (male) 
Cloacal aperture terminal, median; { female) 3 
3. External cuticidar layer, in completely developed individuals, is devoid of 
areolar formations Gordius (female) 
External cuticidar layer with various lands of areolar formations, and with 
hyaline clubshaped processes Chordodes (female) 
4. A postcloacal fold jjresent in form of a. lamina Gordius (male) 
Xo postcloacal fold present 5 
5. External ciiticular layer presents areolar formations of a single kind, pro- 
jecting very little and irregularly disposed; no interareolar refringent 
granules or tubercles Paragordius (male) 
External cuticidar layer less complica.ted than in Chordodes; uith only one or 
tvjo lands of areolar formations; some of these are shallow and clear, and others 
a little more elevated and. darher are around the opening of minute canals which 
traverse the cuticidar layers; granules or refringent tubercules frequent 
among the areolse Parachordodes (male) 
