1900.] FROM THE FALKLAND ISLANDS. 639 



lucida of Sars the second maxillae "are distinguished more particu- 

 larly by the short and broad form of the terminal joint," which is 

 broader than long ; whereas this appendage in the large and 

 apparently cai'eful figure given by Dana has the terminal joint 

 considerably longer than broad. In Sai^s's figure the third peraeopods 

 have the last three joints together not shorter than the preceding 

 joint; while in Dana's figure they are decidedly shorter, though not 

 to so great an extent as in his description. Again, in Sars's pel- 

 lucida the subapical processes of the telson are " finely denticulate 

 along their inner edge," a character belonging also to E. spinifera 

 Sars and E. latifrons Sars, but to none of the other species 

 described in the 'Challenger' Eeport. A character of this minute 

 kind might, it is true, easily have escaped observation by Dana, 

 but it so happens that he expressly applies the epithet " naked " 

 to these processes in E. peUucida. It follows therefore, I think, 

 that for the E. peXlucida of Sars some other name must be used, 

 but this point will be considered to better advantage later on. 



The identification of E. spJendens Sars with the species so 

 named by Dana is also, as Sars admits, beset with difficulties. 

 Thus, in Sars's form the carapace has a denticle about the middle of 

 each lower margin ; but Dana says " carapace a little compressed, 

 not toothed." As he does not show or speak of a toothed carapace 

 in any of his four species, this particular negation remains rather 

 mysterious. With another character it is different. Sars writes 

 of E. sphndens, " Antennular peduncle without any trace of dorsal 

 lobes," having previously written in regard to the antennular 

 peduncle of his E. p)elb(cida, "it is more particularly distinguished 

 by the basal joint having at the end above a conspicuous erect 

 leaflet or membranous lobe." But Dana says of E. peUucida, 

 " first basal joint of inner antenna not produced at apex," and 

 of E. splendens, " first joint of inner antennae oblong and pro- 

 duced at apex"; so that either this character is of no importance, 

 or Dana's two species do not agree with the forms to which Sars 

 has attributed their names. Eather curiously, too, Dana says of 

 E. peUucida, " basal scale of outer antennae a little longer than 

 base," but of E. splendens, " basal scale of outer antennae shorter 

 than base"(or, in the Latin, "basin non superans"); whereas Sars 

 states it is the basal scale of E. splendens thdit is decidedly longer than 

 the base, that of his E. peUucida being scarcely at all longer, thus 

 again inverting the relations as given by the twoauthors. According 

 to Sars the inner plate of the uropods in splendens is a little shorter 

 than the outer ; in Dana's detail-figure it is fully as long. Sars 

 says, "The length of the largest specimen reaches about 18 mm., 

 and the species attains accordingly a somewhat larger size than 

 Euphausia pellucidar Dana, on the other hand, who had some 

 fifteen or twenty specimens at command, says : " Length about 

 half an inch," half an inch being also the length which he gives 

 for E. peUucida. The relative lengths of the joints in the thoracic 

 legs appear to agree in the two forms ; but later authors seem to 

 have attached less specific importance to this character than Dana 



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