j\Ir. ,r. Wood-Mason on the Gennn Deidamia. 133 



The I'ollowiiig is a translation of pp. 209-212 of Professor 

 Heller's work *, entitled ' Die Crustaceen dcs sUdlichen 

 Europa ' (Vienna, 1863). 



Genus Polyciieles, C. Heller, 



Sitzungsberichte der kais. Akadeniie der AVissenschaften in 

 Wien, Bd. xlv. Abtli. i. p. 389. 



Integument tliin. Ceplialotliorax longisli quadrangular, 

 in front and behind moderately tapering, above quite level 

 from before baekwards, 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 antennae, on each side a triangular notch ; the lateral 

 borders sharp, tolerably straight, the hinder border deeply 

 emarginate. The cervical fuiTOW on the upper surface distinct. 

 Eyes rudimentary. Antenna? of moderate length, the external 

 ones inserted below and internal to the inner. Peduncle of 

 the inner (upper) antennae 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- 

 tennae somewhat longer than that of the inner ; 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 antennaa, 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 Scyllarus. Sternum narrow ; the 

 legs very closely approximated at their bases. The first four 

 pairs of legs cUdactyle, and the last only tenninated 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 deflexed 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. 



