Mr. J. Wood-Mason on the Genus Deidamia. £33 
The following is a translation of pp. 209-212 of Professor 
Heller’s work *, entitled ‘Die Crustaceen des siidlichen 
Europa’ (Vienna, 1863). 
Genus PoLycHe.es, C. Heller, 
Sitzungsberichte der kais. Akademie der Wissenschaften in 
Wien, Bd. xlv. Abth. i. p. 389. 
Integument thin. Cephalothorax longish quadrangular, 
in front and behind moderately tapering, above quite level 
from before backwards, and slightly convex from side to side : 
the fore margin hollowed out, the two lateral angles pointed ; 
between these and the middle line, behind the insertion of the 
inner antenne, on each side a triangular notch; the lateral 
borders sharp, tolerably straight, the hinder border deeply 
emarginate. ‘The cervical furrow on the upper surface distinct. 
Eyes rudimentary. Antenne of moderate length, the external 
ones inserted below and internal to the mner. Peduncle of 
the inner (upper) antenne flattened ; the first joint very broad, 
and provided on the inner side with a long spine directed for- 
wards; the two succeeding joints short; of the two flagella 
the inner long, the outer short. Peduncle of the outer an- 
tenne somewhat longer than that of the mner; the short tri- 
angular basilar joint armed at the anterior extremity with a 
small’ spine; the two succeeding joints tolerably long and 
narrow ; the flagella considerably shorter than the whole 
animal: the leaf-shaped appendage, which proceeds outwards 
from the basilar joint, narrow, thickly fringed with hairs on 
the margins, shorter than the peduncle. ‘The external max- 
illipeds small and slender, somewhat shorter than the peduncle 
of the lower antenne, six-jointed, externally without palps; 
the palp is likewise wanting in the second pair of maxillipeds. 
The first pair of maxillipeds is much elongated; in other 
respects formed just as in Seyllarus. Sternum narrow ; the 
legs very closely approximated at their bases. The first four 
pairs of legs didactyle, and the last only terminated by a 
simple claw. The anterior much longer, though but little 
stouter, than the succeeding pairs, their several joints strongly 
compressed ; the finger long, straight, and slender ; the slight 
terminal claws strongly bent inwards. The hind body longer 
than the cephalothorax, at its base almost as broad as this, 
gradually tapering posteriorly, the upper surface arched from 
side to side; the strongly detlexed lateral processes tolerably 
broad and rounded off, especially those of the second segment. 
The fan-shaped caudal swimmeret well developed ; its median 
* For figures vide plate vi. 
