CllUSTACEA. 
305 
Gen. 2. Gyropeltis, Heller (1857). Maxillipedes primi pans apice unco 
forti armati (cotyledonibus nullis). Pedes parium l-3‘ flagello instructi. 
Stimulus nullus. Siplio mandibulas tantiim includit. 
1. Gyropeltis longicauda (Hell.); 2. G. doradis (Corn.); 3. G.kollari 
(Hell.) ; P 4. G. lacordaird (And.). 
Then follow descriptions in Latin of the species of both genera, 
of Avhieh only A. corcr/oni is new, this inhabits most of the lakes 
of middle and southern Sweden. 
CoRYCA 51 DA 5 . 
Prof. Hackel (Jena. Zeitschr. Med . nnd Naturwiss. p. 61) 
publishes the results ofhis observations in an elaborate memoir 
on the Coryemdee, which, with other entomostracons Crustacea 
and the larvre of other animals, he found very abundant in the 
Straits of Messina during the winter of 1859-60. 
Among these he was particularly struck with the genus 
Sapphirma, the species of which are remarkable for the beauty 
of their prismatic hues and for their great transparency. He de- 
scribes the male, of which Claus had only been able to get 
females, giving the following characters : — ' 
llody oval, dorso-veiitrally strongly compressed, foliaceous, thin, mostly 
tolerably transparent, coloured with prismatic hues. Pereion formed of five 
somites, the fifth somite rudimentary and covered by the fourth. The fifth 
pair of feet consisting of a single-jointed stump (Stummel). The first four 
pairs of feet with two three-jointed branches. Anterior antennae formed of 4, 
5, or G joints ; posterior antennae formed of 4 joints, and furnished with a pre- 
hensile hook. The oral appendages consist of sickle-shaped mandibles, 
sqnamiform maxillic, and two pairs of two-jointed footjaws furnished with 
hooks. The middle single eye bladder-formed ; the two side eyes having an 
extended pigment-mass, which is anteriorly furnished with an oval lens. In 
the front of the latter is an independent corneal lens. Intestinal canal sup- 
plied with hepatic appendages. Caudal appendages short, broad and oval. 
He describes Hyalophylhmi as a new genus, but considers it 
to l)e closely allied to Sapphirinella mediterranea of Claus. Tlie 
following is its character : — 
Body oval, dorso-ventrally very compressed, and as transparent as a thin 
film of glass, colourless or but slightly prismatic. Pereion formed of four 
somites, tlie fifth somite, together with the fifth pair of feet, wanting. The 
four existing pairs of feet having two three-jointed branches, on the fourth 
pair the inner branch is one-jointed. The anterior pair of antennae consist of 
4-6 joints; the posterior pair furnished with a prehensile hook. The mouth 
is furnished with two pairs of footjaws — one anterior single-jointed with trian- 
gular cutting-plates, and one posterior consisting of two joints and armed with 
a strongly curved prehensile hook. ^J’he mandibles and maxillae are wanting. 
The two eyes belonging to the pair, and the single central eye, are all in one 
circular mass of pigment, in which are visible the three lenses — one in fronts 
and two side ones. Intestinal canal without hepatic appendages. Caudal ap- 
1864. [voL. I.] X 
