438 M. T. Thorell on the Species of the Argulide. 
y. Pedes parium 1™ et 2 flagello instructi. Stimulus adest. 
Sipho mandibulas tantum includit. (Camulus*, nob.) 
7. A. Nattereri, Hell. 
o. Pedes parium 1™ et 2% flagello instructi. Stimulus nullus? 
Sipho? 
8. A. salmini, Kr. 
9. A. chromidis, Ky. 
10. A. funduli, Kr. 
?1l. A. alose, Gould. 
212. A. elongatus, Hell. 
Gen. II. Gyrorrxtis, Heller (1857). 
Maxillipedes primi paris apice unco forti armati (cotyledonibus 
nullis). Pedes parium 1-3™ flagello instructi. Stimulus nullus. 
Sipho mandibulas tantum includit. 
1. G. longicauda, Hell. 
2. G. doradis, Corn. 
3. G. Kollari, Hell. 
[? 4. G, Lacordaire: (Aud.)] 
I. Arcuuvs, Miiller. 
1. A. purpureus (Risso). 
See p. 158. 
2. A. giganteus, Lucas. 
Syn. Argulus giganteus, Lucas, Exploration scientifique de lAlgérie ; 
Hist. Nat. d. Animaux Articulés, Premiére Partie : Crustacés, (1845) 
p. 83, pl. 8. fig. 9. 
“4, ovatus, flavescens, subtiliter rubro punctatus; testa dilata- 
tissima, membranacea, utrinque fusco-rubescente unilineata. 
Long. 11 millim., latit. 7 millim.” 
Hab. in Mari Mediterraneo, ad oras Africz (Algeriz), in Raj@ sp. inventus. 
I have been obliged to present the above diagnosis as Lucas 
has given it: it is certainly accompanied by a sort of description, 
but from this we get no further knowledge respecting the ani- 
mal. The description, which is taken from a dried specimen, is 
so defective that, were it not that the author expressly says that 
he observed “de chaque cdté de la base du bec, un appendice 
gros et court terminé par une ventouse,cupuliforme,” we should 
hardly be able to recognize the animal as belonging to the Ar- 
eulide. “Il ne me reste,” says he, “de ce crustacé curieux 
que le test.... Les antennes n’existent plus, et les organes de la 
* Nomen propr. mythol. 
