download pdf

60
2. &g& tridens, Leach.
(Pi. XXV, fig. 1.)
jEga tridins, Leach, Trans. Linn. Soc. Vol. XI, p. 370.
Specific Characters. Pody somewhat more elongated than in the preced-
ing species, being nearly 2 and a half times as long as it is broad. Cephalon
rather broad in proportion to its length, and slightly produced in front. Meso-
some moderately convex above, and quite smooth, though having the transverse
lines of the 4 posterior segments very distinctly marked. Metasome rather broad,
with projecting epimera; terminal segment subtriangular, with the tip bi-sinuate,
or projecting in 3 obtuse dentiform projections, dorsal face with 3 obtuse carinse,
the median one rather narrow, the other 2 gradually widening in front. Eyes, an-
tenna?, and legs nearly as in ^E. psora. Uropoda with the inner plate obliquely
truncated at the tip, and devoid of any emargination outside. Length 38 mm.
Remarks. This form, established by Leach, is nearly allied to the pre-
ceding species, though easily distinguishable by the shape and sculpturing
of the
terminal segment of the metasome, and by the absence of a sinus outside the inner
plate of the uropoda. It is also of a somewhat more oblong form than the
said species.
Occurrence. Two specimens of this form are preserved in our University
Museum, having been taken in the Christiania Fjord from the skin of the common
cod. It has also been taken occasionally at Bergen and at Christiansund, but
seems, on the whole, to be very rare. I have not myself observed it in a
living state.
Distribution. British Isles (Leach), Faroe Islands (Schodte & Meinert).
3. vEga Stromii, Ltttken.
(PI. XXV, fig. 2.)
Stfilnm, Liitken, Vid. Medd. Nat. For. Kjobenhavn 1858, p. 68, PI. I. A, fig.s 68.
Syn: ^Eya monophthalma, var., Johnst.
bicarinata, Rathke (not Leach).
ti}i