525 



male very powerfully developed, carpus gradually widening distally, propodos 

 exceedingly large and tumid, ovate in form, and having the distal part of 

 the lower edge clothed with numerous partly ciliated setae, forming a dense 

 brush extending some way up the inner face, which is moreover armed with 

 3 denticles, one of which is placed at some distance from the other 2, at the 

 end of the palm, dactylus about half the length of the propodos, and, when 

 closed, impinging, not against the margin, but upon the inner face of the 

 propodos, so as to be quite hidden, when the leg is viewed from outside. The 

 3 posterior pairs of pereiopoda in both sexes very slender and much elongated, 

 being edged with fascicles of slender spines, basal joint oblong oval, and 

 somewhat tapering distally. Last pair of uropoda fully as long as the 

 urosome, basal part rather elongate, rami scarcely twice as long as the 

 latter, and regularly lanceolate, with scattered spines on both edges. Telson 

 not extending beyond the middle of the basal part of the last pair of uropoda, 

 cleft rather wide and somewhat angular, terminal lobes narrow, and each armed 

 at the obliquely-truncated tip with 3 spines, one of which is very much elon- 

 gated. Body of a golden yellow colour, with an opaque whitish patch in the 

 anterior part of the mesosome, and mottled all over with small red specks; 

 ova in the marsupial pouch dark blue. Length of adult female 8 mm, of 

 male about the same. 



Remarks. - This form was first described in the year 1843 by Rathke 

 as Gammarus SnndetuaUi, and was subsequently referred by Boeck to the 

 genus Cheirocratus of Norman. As first pointed out by Boeck. the Lilljeborgia 

 shetlandica of Sp. Bate is undoubtedly the male of this species, and Mr. Norman 

 has recently shown, that the Protomedeia Whitei of the same author, is 

 nothing else than the female. Also the Lilljeborgia Normani of Stebbing 

 and the Cheirocratns brevicornis of Hoek ought to be regarded as merely 

 synonyms. This species may be best distinguished from the other forms of 

 this genus, by the peculiar structure of the posterior gnathopoda in the male. 



Occurrence. I have met with this form rather frequently along 

 the whole south and west coasts of Norway, up to the Trondhjemsfjord, 

 in moderate depths, from 3 to 50 fathoms, especially where the bottom is 

 covered with decaying algae. According to Boeck, it extends northwards to 

 the Lofoten Isles (Skraaven). 



Distribution. British Isles (Norman), Boliuslan (Bruzelius), Kattegat 

 (Meinert), Dutch coast (Hoek), coast of France (Chevreux). 



69 Crustacea. 



