54 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
APPENDIX. 
Since the preceding was sent to press (on the 16th August, 1897) I have re- 
ceived from Professor Camerano the following important contribution by him: 
“Monografia dei Gordii” (Accademia Reale delle Scienze di Torino, 1897). 
This paper furnishes descriptions and revisions of all known species of Gordi- 
acea, with illustrations of all those described by Camerano, and is especially 
valuable on this account from the systematic standpoint. To the already 
known genera Gordius and Chordodes, this author adds two others, namely, 
Paragordius and Parachordodes. Paragordius embraces, according to Camerano, 
G. tricuspidatus (Dufour), G. emeryi Cam., G. stylosus Linstow, and G. varius 
Leidy. He characterizes it as follows: “ L’ estremita posteriore del ¢ é bifor- 
cata al di 1a dell’ apertura postcloacale con lobi profondamente separati fra 
loro: non vi é lamina cutanea postcloacale. L’ estremita posteriore della 9 @ 
divisa in tre lobi postcloacali profondamente separati fra loro i quali circondano 
V apertura cloacale. Lo strato cuticolare esterno presenta delle formazioni 
areolari di una sola seria e pochissimo sporgenti, irregolarmente disposte: non 
vi sono granuli o tubercoli rifrangenti interareolari.’ By an unusual coinci- 
dence, I had in the preceding pages proposed the same name, Paragordius, to 
include Leidy’s species Gordius varius, so that independently of one another 
Camerano and I have founded a new genus, and given it the same name for 
the same species. By the rules of priority in nomenclature, however, Camerano’s 
publication having appeared first, the genus must stand Paragordius Camerano, 
not Montgomery. But the diagnostic given by Camerano for this new species 
is not very well chosen, for in it the only character of possible genetic value 
mentioned is the trilobation of the posterior end in the female; this character 
is of doubtful generic value, since in Gordius tolosanus Duj. the posterior end 
of the female is somewhat lobed, though in this case the lobation is gener- 
ally regarded as only a specific character! I think the characters described 
above by me as diagnostic of the new genus, —namely, the structure of the 
cloaca in the female and the absence of a cloacal musculature in the male, — are 
of higher value, and accordingly should constitute the diagnostic of the genus. 
The second new genus of Camerano is characterized thus (Parachordodes): 
‘«Estremita posteriore del 3 biforcata al di 14 apertura cloacale, con lobi pro- 
fondamente separati fra loro: nessuna lamina-cutanea postcloacale. L’ es- 
tremita posteriore della 9 @ intiera coll’ apertura cloacale mediana collocata in 
un soleco dorso ventrale pi o meno profondo. Strato cuticolare esterno meno 
