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to he identical with a form previously described hy the present author as a
species of the genus Desmosoma. Though this form on the whole agrees very
closely with the 2 above-described species, yet there are at least 2 characters,
in which it differs very markedly, viz.. the structure of the 1st pair of legs and
that of the uropoda, and for this reason I think it right to maintain the genus
proposed by Prof. Meinert,
the more so as I have found it advisable to raise
another species, previously referred by me to the genus Desmosoma, to the rank
of a distinct genus.
Eugerda tenuimana,
(PI. LV.)
G. 0. Sars.
Desmosoma Icniiliitauum, G. 0. Sars, Beretiiing om en i Sommeren 18(55 foretagen zool. Reise
ved Kysterne af Christianias og Christiansands Stifter, p. 33.
Sj'n : Eugerda
ylobiceps, Meinert.
Specific Characters. Body slender and elongated, more than 4 times as
long as it is broad, with a very conspicuous
constriction between the 2 sections
of mesosome. Cephalon of a similar form to that in Desmosoma lineare, though
comparatively somewhat larger. Anterior section of mesosome about the length
of the first 2 segments of the posterior combined, and, in female, "somewhat
broader than the latter; 1st segment in both sexes much smaller than the 3 suc-
ceeding ones, which are produced on each side to acute anteriorly-pointing lappets
assuming in male a spiniform appearance. The 3 posterior segments of mesosome
laminar, sub-quadrate in outline, and somewhat broader in male than in female;
antero-lateral corner of 5th segment not produced. Caudal segment in female
oval, narrowly rounded at the tip, in male almost quadrate in outline, tip blunted,
lateral corners rectangular. Superior
antennce 6-articulate. Inferior antennas in
female very slender, considerably exceeding half the length of the body, flagellum
about the length of the peduncle, and composed of about 16 articulations; those
in male transformed in a manner similar to that in the male of Desmosoma lineare,
though less strongly built: 2nd joint of the peduncle armed outside with a single
spine, 4th joint with 2 successive spines, last joint unarmed and considerably
larger than the penultimate, flagellum but slightly tumefied in its proximal part.
1st pair of legs very slender and elongated, carpus and propodos extremely nar-
row and perfectly smooth ; the 3 succeeding pairs densely clothed with slender
spines arranged in a double row ; the 3 posterior pairs of nearly exactly
the same
structure as in Desmosoma lineare. Uropoda with the inner ramus linear, and
about 3 times as long as the basal part, outer ramus not attaining half the length