453 



crenulata of Kreyer is undoubtedly, as first pointed out by Boeck, only the 

 male of this species. 



Occurrence. I have never myself met with this form, and even 

 Boeck does not record it at all from the coast of Norway. On looking over 

 his collections, I have, however, found a few specimens of this form labelled 

 Karme, southwest coast of Norway, and through the kindness of Dr. Hansen 

 I have, moreover, had an opportunity of examining some well-marked speci- 

 mens in the Copenhagen Museum, collected, according to the label, likewise 

 off the west coast of Norway. I therefore feel entitled to introduce this form 

 in the fauna of Norway. 



Distribution. Arctic Ocean: Greenland (Kreyer), the Siberian Polar 

 Sea (Stuxberg). 



Gen. 6. Laothoe 1 ), Boeck, 1870. 



Body slender, though scarcely at all compressed, with the back quite 

 smooth. Cephalon rather large and thick, with a very slight rostral projec- 

 tion. Coxal plates not very large. Eyes distinct and of the usual structure. 

 Antennas slender, the superior ones being shorter than the inferior, and having 

 the 2 outer joints of the peduncle quite short, accessory appendage wanting. 

 Buccal area very massive and greatly projecting. Anterior lip rounded 

 triangular; posterior lip without any inner lobes. Mandibles very strong, 

 masticatory part greatly projecting, and having the cutting edge divided into 

 a series of coarse teeth, secondary lamella distinct on both mandibles, molar 

 expansion thick and massive, palp of moderate size, with the terminal joint 

 shorter than the 2nd. First pair of maxillae with the masticatory lobe rather 

 large, and armed at the end with strong denticulated spines, basal lobe of 

 moderate size, and carrying a number of rather short but thick ciliated setae, 

 palp very small, its terminal joint being quite rudimentary, nodiform. Second 

 pair of maxillae with both lobes rather produced, the inner one edged with a 

 small number of coarse denticulated spines. Maxillipeds with the basal lobes 

 normally developed, and rather large, masticatory lobes of quite an unusual 

 size, forming very large and broad lamellae, reaching to the end of the palp, 

 and having their inner edge regularly serrated throughout, palp comparatively 

 slender. Gnathopoda very small and feeble in structure, carpus rather 



) As the term Laothoes, according to Boeck, has been long ago appropriated in Zoology, 



I think it may be suitable to substitute the feminine form of the same name. 

 59 Crustacea. 



