22 



First pair of maxilla- with the palp obsolete, or nearly so, masticatory lobe 

 \\-t.-ll developed and furnished at the tip with several strong denticulated spines, 

 kisal lobe very narrow, with '2 short and densely ciliated curved seta? at the 

 tip. Second pair of maxillae with the lobes rather broad and densely seti- 

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

 and rounded, basal lobes much larger and armed at the tip with short teeth 

 and bristles; palp rather large, with the joints coinplanated and short hairy 

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

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

 edged with tufts of short spines, the 3 posterior pairs successively increasing 

 in length and having the basal joint broad and laminar. Branchial lamella? 

 generally very small and vesicular in form. Pleopoda poorly developed. The 

 2 first pairs of uropoda strong, with both rami, as also the basal part, den- 

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

 short and thick. 



I!< ii/arJis. - This is a rather distinct family, which even by Milne-Ed- 

 wards and other authors has been 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 accordance therewith exhibit some 

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

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

 or abrupt hops. Besides the o genera described below and belonging to 

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

 Orchestoidea Nicolet and Tallorchcytia Dana, both of which seem to be nearest 

 related to the genus 



Gen 1. TalltrUS, Latreille, 1802. 



Body less compressed, with broadly rounded back. First pair of coxal 

 plates smaller than the 2nd, 5th pair rather large, regularly bilobed. Superior 

 antennae very small, much shorter than the peduncle of the inferior; the latter 

 elongated, subpediform, much stronger in male than in female, the 2 basal 

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

 First pair of maxilla? with only a slight rudiment of a palp. Maxillipeds 

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

 Anterior gnathopoda simple, not subeheliform, somewhat stronger in male, 

 earpal join) elongated and linear in form. Posterior gnathopoda in both sexes 

 of similar structure, rather feelilr and almost bare, terminating with an imper- 

 fectly ehelit'onn hand, the daetvlns being quite rudimentary. Braneliial lamella 3 



