Dr. A. Philippi’s Zoological Notices. 97 
is the parallelism between Nauplius and Peltidium, and be- 
tween Psamathe and Thyone. 
4. Thyone, mihi. (Pl. IV. fig. 2.) 
Corpus depressum scutiforme, ovatum, segmentis quinque con- 
stans, segmento primo maximo. Cauda e lamellis duabus for- 
mata. Oculi duo confluentes. Antenne quatuor; anteriores 
multiarticulate ; inferiores triarticulate, apice setis uncinatis, 
basi seta pectinata munite. Pes masticatorius apice lamellis 
duabus terminatus. Pedes sex, natatorii, birami; Pedes spurit 
duo lamellares, spatium inter segmentum penultimum caudam- 
que opplentes. 
Three species, the one, Th. viridis, nearly #” long, common. 
The cibarian apparatus exceedingly complicated.—Peltidium 
differs by the foot-jaws, the tail, and by the first pair of feet 
being differently constructed; Sapphirina, Thompson, from 
the body having nine segments. ‘There are two pairs of pe- 
culiar fringed lamellz near the cibarian organs (fig. 2 e. and g.), 
perhaps analogous to those lamella in Cypris, regarded by 
Strauss as branchie. 
5. Peneus siphonoceros, mihi. (Pl. IV. fig. 3.) 
P. rostro brevissimo, supra 7-dentato inermi; flagellis antennarum 
superiorum equalibus, omnibus quatuor canalem clausum for- 
mantibus. 
IT have gradually obtained in Naples about half a dozen in- 
dividuals of this Peneus, so highly remarkable for the curious 
formation of the flagella of the upper antennz. They are 
flesh-coloured, the antenne, feet, and the hinder margins of 
the abdominal segments darker. “The length from the apex 
of the beak to the extremity of the tail amounts to 24 inches, 
of which the abdomen is 1 inch 7 lines, and the beak scarcely 
21 lines. The cephalothorax has no longitudinal furrows. 
The abdomen is, as usual, very much compressed, the last 
three joints keeled. The terminal segment has in the centre 
a broad groove, and terminates with two points. The scale 
(Schuppe) of the exterior antenne is quite twice as long as 
the beak, of usual form, with a longitudinal groove ; the stalk 
does not attain to half the length of the scale; the flagellum 
is once and a half as long as the body. The inner antenne 
have a very thick stalk, as long as the scale of the outer an- 
tenne, at the base excavated, as usual, for the large black eyes, 
and with a curved anteriorly directed appendage (process). 
They have two equally long, and as above stated, very pecu- 
liarly formed flagella. They form, namely, with those of the 
other side, an almost closed tube. For this purpose each single 
Ann. & Mag. Nai. Hist. Oct. 1840. i 
