. 0 b c d, dp e Fig. 32. Ends of the basal segments of the left antennular peduncles of the species of the southern group showing lappets and spines, from above, a, E. lucens; b, E. vallentini; c, E. frigida; d, E. superba; e, E. crys- tallorophias. a, x 18; b, c and e, x 12; di, x 10; dz, x ii. enormous lobe in E. superba and none in E. crystallorophias, it may have in the former, and it always has in the latter, a spine on the outer distal corner such as is not found in adult E. lucens, E. vallentini or E. frigida (Fig. 32).^ If these are evidences of affinity then the group of five species
. 0 b c d, dp e Fig. 32. Ends of the basal segments of the left antennular peduncles of the species of the southern group showing lappets and spines, from above, a, E. lucens; b, E. vallentini; c, E. frigida; d, E. superba; e, E. crys- tallorophias. a, x 18; b, c and e, x 12; di, x 10; dz, x ii. enormous lobe in E. superba and none in E. crystallorophias, it may have in the former, and it always has in the latter, a spine on the outer distal corner such as is not found in adult E. lucens, E. vallentini or E. frigida (Fig. 32).^ If these are evidences of affinity then the group of five species falls into two divisions corresponding with the order of their occurrence from north to south—a northerly and a southerly division. The copulatory organs of the northerly species have some features which suggest that their re- lationship is in the order E. lucens, E. vallentini, E. frigida—which is that of their occurrence from north to south. E. vallentini, the middle member, shares with each of the end members a character not possessed by the other: the two parts into which the end of its terminal process are cleft are blunt and rounded as in E. lucens, not flattened with one part lobed and the other serrated as in E. frigida; but, like E. frigida and unlike E. lucens, its lateral process has a tiny projection near the axil of the distal tooth. It stands midway between them in the proportional lengths of the terminal ^ Or in any other species in the genus. 8-2
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
