M.T. Thorell on the Species of the Argulide. AAS 
3. G. Kollari, Hell. 
Syn. Gyropeltis Kollari, Heller, Sitzungsberichte d. Kais. Akad. d. Wis- 
sensch., Math. -Naturwissensch. Cl., (1857) xxv. p. 102, taf. 1. 
fige. 20, 21; taf. 2. figg. 1-3. 
Scutum cephalicum inverse subcordatum, amplum, omnes pedes 
et basin caudz tegens; cauda brevis, g-z reliqui corporis 
longitudinis zquans, inverse rotundato-ovata, postice parum 
profunde incisa, laciniis brevibus obtusis ; pectinis dentes 3 
breves, obtusi.—Longit, 12, latit. 9 millim. (¢). 
Hab. in America meridionali (Brasilia). Hospitium ignotum. 
?4. G. Lacordairei (Aud.). 
Syn. Dolops Lacordairei, Audouin, Annales de la Soc. Entomol. de France, 
sér. 1. t. vi. (1837), Bull. p. 13. 
Long. plus 15 millim. 
Hab. in America meridionali (Cayenne), in pisce Aymara dicto parasitans. 
Concerning this animal we have the following remarks from 
the above-cited source :— 
“ M.Audouin présente deux individus deel crustacé singulier, 
qui a beaucoup d’analogie avec lArgule foliacé de Jurine, mais 
qui en différe surtout par ’absence de ventouses aux pattes an- 
térieures, et par sa taille, qui dépasse un centimétre et demi. 
“Ce crustacé a été trouvé 4 Cayenne par M. Lacordaire; il 
est parasite sur un poisson nommé Aymara, dont la chair est 
trés-estimée, et qui vit dans toutes les riviéres. M. Audouin 
en donne la description et le regarde comme le type d’un nou- 
veau genre, auquel il assigne le nom de Dolops. 11 dédie cette 
espéce & M. Lacordaire : 
“ Dolops Lacordairei. Ce nouveau genre sera décrit en détail 
et figuré.” 
That this Dolops Lacordarei is a Gyropeltis, or at least stands 
very near this genus, may be regarded as certain. But although 
the name Dolups is older than Gyropeléis, 1s seems to me in every 
respect more desirable to retain the latter appellation, inasmuch 
as Audouin did not determine or clearly point out the characters 
on which he founds the genus Dolops. No description of the 
species has, as far as I can discover, been published. 
As at the most sixteen species of the family Argulidze are as 
yet known, and as this number will undoubtedly be “considerably 
increased, it would be premature now to attempt to draw, from 
what is known of the localities of these species, any general 
conclusions as to the geographical range of the family. We may, 
however, suppose with Kroyer that the great American continent 
Ann. & Mag. N. Hist. Ser. 3. Vol, xvii. ol 
