occurring on the Norwegian Coasts. 409 



species cristata from Nordiishaven ; and it was retained by 

 Milne-Edwards, who distinguislied it from the genus Amplii- 

 tho'e on the ground that the iirst two pairs of legs are not fur- 

 nished with prehensile hands. The body in this genus is 

 stout, elevated, keeled, and spiny, fimiished with large high 

 cpimera and hemispherically jjrominent eyes ; the head is 

 short, and runs out into a very long, laterally compressed, high 

 rostrum. This separates from each other the superior antenrue, 

 which are elongated and destitute of a secondary flagcllum. 

 The first pair of legs is not provided with a prehensile hand ; 

 the second has only a weak one. The parts of the mouth are 

 especially peculiar, and differ much from the form which they 

 have in the preceding genera ; the mandibles are very long, 

 and bipartite at the apex, but with the inner branch very 

 small ; the masticatory tubercles are wanting, and the palpi 

 are three-jointed ; the labium is elongated ,• the first pair of 

 maxilltB are strong ; their outer lamella is nearly triangular and 

 oval at the apex, fm-nished on the inner side with strong ser- 

 rated spines and hairs ; the palpi are very short and weak, 

 shorter than the outer lamella, two-jointed, with the joints of 

 equal length. The inner lamella is large and triangular, but 

 shorter than the outer ; its inner side is fm'nished with a great 

 number (twenty-foiu-) of strong, ciliated hairs. The maxilli- 

 pedes are short, broad, and strong, their inner lamella very 

 long ; the third joint of the palpi and the lower inner angle 

 are produced into a process ; the fourth joint is extremely 

 short, almost rudimentary. Two species occur with us : — 



1. A. ser7'a, Kr., and 



2. A. cristata, Owen. — The latter has been found by Sars 

 in Finmark ; and to his description I will add something upon 

 the fonn of the buccal organs, which he has not treated of. 

 The inner branch of the a])ex of the mandible is large and 

 slightly triangular ; it occurs also in serra, but is very small, 

 and was therefore not detected by Kroyer and Bruzelius. The 

 maxillipcdes arc much shorter and broader than in serra ; the 

 fourth joint or claw of their ])alpi consists here only of a small 

 bhmt tubercle. The telson is less stout in proportion than in 

 the other species, and is triangularly emarginate at the apex. 



Ijyhimedia, H. Kathke. — This genus, which Kroyer has 

 named Microcheles, shows much agreement with the preced- 

 ing in its external characters, but differs in certain parts. It 

 has a stout elevated body, furnished with keel and spines, 

 and oval rigid cpimera. The rostrum, like that of the pre- 

 ceding genus, separates the superior antenna^ ; but the buccal 

 organs here acquire a different form, which justifies the sepa- 

 ration of this as a distinct genus from the foregoing. The 



