REV. T. R. R. STEBBING—CRUSTACEA ISOPODA AND TANAIDACEA. 223 
some genera of this family the mouth-parts in ovigerous females are meta- 
morphosed in a very peculiar way. In the egg-bearing females of C. pilosa 
he states that the incisive process or cutting-edge is rounded and yellowish, 
which shows that it is less hard than in the male, that the secondary plate 
has disappeared, while the molar process is very low, scarcely developed, 
and without equipment for trituration. The female first maxillz, he says, 
have been altered in a corresponding way ; the distal half of the inner lobe 
is much narrower than in the male, “its end rounded and the stiff sete lost ; 
the outer lobe has gained a number of fine hairs, but its end is rounded and 
of the strong terminal spines at most a rudiment and generally nothing 
remains.” The lobes of the second maxille have lost all their numerous sete 
found in the male and in immature specimens, and the bifid outer lobe has 
been shortened. ‘Besides, all these mouth-parts have the muscles con- 
siderably or much reduced; but the muscles to the mandibular palps, still 
shaped as in the males, have been preserved.” The lower lip has been 
much reduced, being only about half as large as in the male. “‘The 
maxillipeds are still more interesting; in the female with brood... . the 
four distal joints have been reduced in size, especially the lobes are much 
shorter and have lost all the sete found in other specimens ....; the lobe 
from second joint has lost its distal setze, but the two proximal joints with 
the epipod are, on the contrary, expanded to such a degree that their joint 
surface is between twice and three times larger than in the male of the same 
size ; some of the muscles of the palp have been reduced in size and all are 
lighter in aspect, while the musculature moving the expanded proximal 
portion is well developed.” Later on Hansen makes it clear that exact 
similarity among specimens with metamorphosed mouth-parts need not 
be expected. He says: “Of ten females with marsupium of Cymodoce 
pilosa (M.-Edw.) eight had all their mouth-parts altered as described above, 
but in two specimens the curious feature was observed that the maxillipeds 
and [second] maxille had been completely metamorphosed, while the 
alterations in the two anterior pairs of appendages were less complete. In 
one of these specimens the end of the mandibles had kept their dark colour 
and the outer lobe of both maxillule [first maxille] their spines, while 
lacinia mobilis [accessory plate of mandibles], ete., had disappeared ; in the 
other specimen only a little of the dark colour on the end of the mandibles 
and the spines on one of the maxillule were preserved.” 
In both the Suez specimens examined the mandibles are dark, and in both 
the lobe from the second joint of the maxillipeds shows little spine-teeth or 
spinules on the inner part of the distal border. In at least one instance there 
are two simple spines on the narrowed apex of the outer plate of the first 
maxille. In all cases the palp of the mandibles retains the setose armature 
of the second and third joints, each of which is shorter than the first. 
In the Ceylon report I have figured a species under the name Cilicea (?), 
