This genus was established on a single species, .S. cylindrata G.O.S., of a peculiar aspect. This
form is in most characters allied to species of Leptognathia with the pleopods rudimentary or wanting,
but it differs by having the abdomen in the female and the subadult male extremely long, only some-
what shorter or even as long as the five posterior thoracic segments combined, while the sixth ab-
dominal segment is extremely long, at least a little longer than the three preceding segments combined,
and the biramous uropods are small and thick. Furthermore it differs from Lef/ognathia and reminds
of Cryptocope arctica and Tanaopsis in having third and fourth thoracic segments each conspicuously
shorter than the fifth or the sixth segment, the three anterior segments together being in reality
scarcely as long as the sum of fourth and fifth segments.
The “Ingolf’ material contains two species which I refer to Strongyluwra; one of them is less
characteristic than S. cy/indrata, while the other species is somewhat difficult, but after long hesitation
I have referred it to S\ cyléndrata.
Cryptocope arctophylax, established by Norman & Stebbing as a species of Strongylura, differs
widely from this genus but is, as already stated, allied to Cryptocope Voringit G.O.S. No other species


hitherto described has been referred to Strongylura.
73. Strongylura cylindrata G. O. Sars.
(Pl. XII, figs. ra—1l1.)


1881. Strongylura cylindrata G.O. Sars, Archiv for Math. og Naturv., B. VII, p. 53.
! 1896. _ - — Account Crust. Norway, Vol. II, p. 36, Pl. XVI, fig. 1.
