22 



First pair of maxillai with tla- palp ubsolute, or nearly so, masticatory lolje 

 well developed and furnished at the tip with several strong denticulated spines, 

 basal lobe very narrow, with 2 short aud densely ciliated curved setoe at the 

 tip. Second ]iair of nuixilla? with the lol)es rather broad and densely seti- 

 ferous on the inner edge. Maxillipeds having the nuisticatory lobes very small 

 and rounded, busal lobes mucli larger and armed at the tip with short teeth 

 and Ijristles; palj) rather large, with the joints complanated and short hairy 

 at the edges. Gnathopoda of various structure in the several genera, 2nd 

 pair more generally very diiferent in the two sexes. Pereiopoda rather strong, 

 edged with tufts of .short spines, the 3 posterior j)airs successively increasing 

 in length and having the basal joint broad and lanunar. Branchial lamelliE 

 generally very small and vesicular in form. Pleo])oda ])oorly developed. The 

 2 first pairs of urojioda strong, with 1)oth rami, as also the basal part, den- 

 ticulated; last pair very small, with only a single minute ramus. Telson 

 short and thick. 



liciiiarlcs. — This is a rather distinct famil\', which even by ililne-Ed- 

 wards and other authors has Ijeen elevated to the rank of a tribe (Saltatoria). 

 It comprises a number of Grammaridea, which more or less have adapted 

 themselves to a terrestrial life and in accm-dance therewith exkibit some 

 particular characters not found in other Amjiliipoda. Moreover their mode of 

 progressimi, when out of water, is very peculiar and is effected by quick leaps 

 or alu'U]it hops. Besides the o genera described below and belonging to 

 the Norwegian fauna, two other exotic genera have been established, viz, 

 Orchi:stoi(lca Nicolet and TaUorrlir.--fi<i Dana, both of which seem to be nearest 

 related to the o-enus ()rchct<tia. 



Uen 1. TalitrUS, Latreille, 1S()2. 



Body less compressed, with broadly rounded back. First ])air of coxal 

 plates snmller than the 2nd, 5th pair rather large, regularh- bilobed. Superior 

 antennw very small, much shcu'ter than the peduncle of the inferior ; the latter 

 elongated, subpedifbrm, nuich stronger in male than in female, the 2 Ijasal 

 joints more or less completely coalesced with the cephalon; no olfactory siiine. 

 First ])air of maxillse with only a slight rudiment of a palp. Maxillipeds 

 with the palp ratlier short and broad, terminal joint, or dactylus, quite wanting. 

 Anterior guatluqioda simple, not subcludiform, somewhat stronger in male, 

 carpal joint elongated and linear in foi'ni. Posterior gnathopoda in both sexes 

 of similar structure, rather feelde and almost bare, terminating with an im])er- 

 t'ectly cheliform hand, the dactylus being quite rudimentary. Branchial lamelhTp 



