444< M. T. Thorcll on the Species of Ike Argulidse. 



cordatum, postice parum sinuatum, non cxcisum, neque tmn- 

 cuni nee pedes tegens ; cauda circa j longitudinis reliqui cor- 

 poris a^qnans; profunde incisa^ lobis sat longis, lauceolatis ; 

 cotj'ledones parvi; art. primus maxillipedum secundi paris 

 dentibus caret. — Longit. 10 millim., latit. 6 millim. ( ? ). 

 Hab. in America meridionali (Brasilia). Ilospitium ignotum. 



Amongst all known species of Argulids this one has the head- 

 shield least developed, and its appearance is therefore very dif- 

 ferent from that of the others. Heller's description is very 

 brief, and leaves undetermined, as does also his figure, whether 

 the animal has a sting {gadd), and whether its feet are provided 

 with flagella or not. 



Ohs. Argulus armiger, Miill. (Entomostraca, p. 124) = Mono- 

 culus armiger, Slabber*, is no Argulus, but the larva of a Cirri- 

 pede. 



II. Gi'ROPELTis, Heller. 



I. G. longicauda, Hell. 



Syn, Gyropeltis longicauda. Heller, Sitzungsberichte d. Kais. Akail. d. 

 Wissensch., Math.-Natimvissensch. CI., (1857) xxv. p. 191, taf. 1. 

 figg. 1-19; Kroyer, Naturhist. Tidskr. 3die Rsekke, (1863) ii. 

 pp. 99, 103, tab. i. fig. 4 a-e. 



Scutum cephalicum suborbiculare, amplum, omnes pedes tegens ; 

 Cauda longissima, 1^-3-plo longior et duplo angustior quam 

 scutum et reliquum corpus, fere usque ad basin in duas laci- 

 nias angustas, sensim lanceolato-acuminatas fissa; pectinis 

 dentes 3 conici, acuti. — Longit. 28, latit. 11 millim. ((5" ? )• 



Hah. in America meridionali (Brasilia), in branchiis Salmini brevidentis 

 (Cuv.) inventus. 



2. G. doradis, Corn. 



Syn. Gyropeltis doradis, Cornalia, Mem. del R. Istit. Lombardo, (1860) 

 viii. pp. 161, tab. 2. figg. 1-18. 



Scutum cephalicum suborbiculare, pedes ultimi paris vix tegens; 

 Cauda sat longior, reliqui corporis dimidiam longitudinem 

 circiter sequans, fere usque ad basin in duas lacinias angustas, 

 sublanceolatas fissa ; pectinis dentes 3 breves, acuti. — Longit. 

 22, latit. 11 millim. (?). 



Hab, in America aequinoctiali, in corpore Doradis nigri Valenc. inventus. 



described. That described in vol. xxxiv. p. 225 is a Caligus (C. ameri' 

 canus, Pickering & Dana), not an Argulus. 



* Natuurkundige Verlustigingen, behelzende microscopische waarnee- 

 mingen, &c. (1769), cited from P. L. St. Mliller's German translation : 

 Pliysikalische Belustigungen, &c. (1775) p. 19, tab. 6. fig. 1. 



