18 



less fully developed than in the Cnmidce, branchial elements scattered, digiti- 

 form. 3rd pair of maxillipeds with the outer corner of the basal joint not 

 produced. 1st pair of legs generally very slender; 2nd pair likewise slender, 

 with the full number of joints, and in both sexes provided with well developed 

 natatory exopodites ; 3rd and 4th pairs in female with a small biarticulate ap- 

 pendage near the base (rudimentary exopodite). All the legs in male, except the last, 

 provided with natatory exopodites. Pleopoda in male generally present on the 

 3 anterior caudal segments, more rarely wholly wanting as in the female. Uro- 

 pocla very slender, with the inner ramus always longer than the outer, and di- 

 stinctly 3-articulate. Telson with more than 2 apical spines. 



Remarks. The forms belonging to this family are at once distinguished 

 from the Cumidoe to which they bear considerable resemblance in the general 

 form of the body by the presence of a well-developed telson, a character only 

 found in 2 of the other families, viz., the Platyaspidce and the Diastylidce. 

 Moreover the structure of the antennae and uropoda is essentially different, and 

 in no case are there more than 3 pairs of pleopoda in the male. On the other 

 hand, unlike what is the case in the Cumidce, in this sex all the legs, except 

 the last pair, are provided with well-developed natatory exopodites. The family 

 comprises, as yet, 3 genera, viz., Lamprops, Hemilamprops and Paralamprops. Of 

 these genera, the first 2 are represented in the fauna of Norway, and will be 

 treated of below. 



Gen. 1. LamprOpS, G. 0. Sars, 1862. 



Generic Characters. Body less slender than in the other genera, with 

 the anterior and posterior divisions more sharply marked of from each other. 

 Carapace of moderate size, upper margin straight, pseudorostral projection more 

 or less prominent, antero-lateral corners obtuse. 2nd and 3rd pedigerous seg- 

 ments rather large, with broad epimeral plates. Tail, exclusive of the caudal 

 appendages, scarcely longer than the anterior division. Eye well developed, with 

 distinct corneal lenses. Superior antenna? with the flagella not much elongated, 

 the outer one in female 3-articulate, the inner biarticulate. Inferior antennas in 

 male much shorter than the body, and in some cases pronouncedly prehensile. 

 1st pair of legs of moderate length; 2nd pair not much smaller. Pleopoda in 



