M. T. Thorell on ¢wo European Argulide. 161 
rarius albo punctatum, vittis in utraque ala 3 violaceis, parallelis, 
versus apicem scuti latioribus et confluentibus, et linea tenui, obscurius 
violacea, antice introrsum geniculata, inter vittas duas interiores ducta. 
Lobus frontalis margine subviolaceo. Rami gastrici luteo-fusci. 
Ovarium in dorso perlucens album, dense violaceo punctatum, linea 
media ad longitudinem ducta, purius alba geminatum. Cauda scuto 
pallidior, densius albo punctata, versus apicem et in margine externo 
pallide violacea, vitta violacea ad marginem internum, receptaculis 
seminis obscure fuscis. Truncus subtus in medio late fuscus, in 
lateribus albicans, ipso margine cum stipite pedum czeruleo-virescens, 
Dentes corporis, partium oris, maxillipedum cet., cum annulo 
chitinoso cotyledonum fusci. Partes oris ceterum, ut rami pedum, 
hyaline. 
With regard to the internal conformation of the animal, I have 
only the following to communicate. It differs from A. foliaceus 
in the fact that the large side branches of the stomach send out 
smaller branches, not only on the outer but on the inner side 
also. The outbranchings of the stomach are on the following 
plan :—Immediately before the first pair of legs the stomach 
sends out on either side a strong, outwardly and somewhat 
backwardly directed stem, which, when it has attained almost 
the middle of the wing of the shield, bends backwards at almost 
a right angle, sending immediately a strong stem forwards. 
This divides soon after into two smaller stems, which stretch 
backwards towards the end of the shield, and on either side 
send forth numerous branches and subbranches, which, however, 
never anastomose with one another. Even the short anteriorly 
directed stem branches forward in the same manner. In all 
these vessels the rhythmical pulsating backwards and forwards 
of the brownish-yellow contents is perceptible im the living 
animal. The circulation of the blood is particularly evident in 
the broad and thin tail. 
The ovary reaches far forward between the second pair of 
footjaws, and is therefore somewhat poimted at its anterior 
extremity. It is long and narrow (7 millim. long, 2 millim. 
broad), and contais a great many eggs, closely a and 
adhering together, about } millim. in “Tength and + millim. in 
breadth. The eggs show the same formation and. appearance 
as in A. foliaceus and A. coregoni. In the living animal the 
ovary is transparent through the back as a whitish, thickly 
violet-dotted or gan, divided! lengthwise by a clear white band. 
Of this fine species I obtained a single specimen in Nice on the 
8th March, 1862, a female, Fadia upon the inside of the pec- 
teral of Pagellus er ythrinus, Cuv. The right lobe of both the 
head-shield and the tail are somewhat shorter in this specimen 
than the left, which is undoubtedly only an accidental variat ion. 
Risso found this species at Nice, in the month of May, on 
Ann. & Mag. N. Hist, Ser.3. Vol.xvin. 12 
