184 Rey. T. R. R. Stebbing on new 
Fig. 3. Ptilodictya flagellum, Nich., of the natural size. 3a. Transverse 
section of the same, enlarged. 80. Portion of the surface, 
enlarged. 
Fig. 4. Ptilodictya (?) arctipora, Nich., a fragment, of the natural size. 
4a. Portion of the same, enlarged. 46. A few cells of the 
same, enlarged further. 
Fig. 5. Ptilodictya fenestelliformis, Nich., a fragment near the base of 
the frond, of the natural size. 5a. Transverse section of the 
same, enlarged. 56. Portion of the surface, showing one of 
the non-poriferous areole, enlarged. 
Fig. 6. Fenestella nervata, Nich., a fragment, of the natural size. 
6a. Portion of the same, enlarged. 
Fig. 7. Ceramopora ohioensis, Nich., part of an incrusting specimen, 
greatly enlarged. 7a. A few cells from a worn specimen of 
the same, greatly enlarged. 706. Portion of a young example 
of the same, showing the radiating growth of the cells from a 
central point, enlarged. 7e & 7d. Fragments of much-worn 
specimens of the same (?), showing numerous interstitial tubuli, 
enlarged. 
XXTil.— On some new exotic Sessile-eyed Crustaceans. 
By the Rev. Tuomas R. R, Srespina, M.A. 
[Plate XV. A.] 
I. Or the Crustaceans now to be described, the first is a 
small Amphipod sent to me by H. J. Carter, Esq., F.R.S., 
who found three specimens of it in a sponge, a branched 
Suberite, from the Antarctic sea, dredged up by Sir J. Ross 
in S. lat. about 774° and E. long. 175°, from a depth of 
300 fathoms. 
Two of the specimens are about an eighth of an inch in 
length, the third being very much smaller. Whether the 
larger pair had attained their full size or not is open to 
question. All are of a dark-brown colour—in that respect, 
Mr. Carter tells me, resembling the sponge from which he 
took them. All were closely coiled up, with the gnathopods 
hidden and tail and antenne tucked under the body. ‘This 
posture, coupled with the breadth of the pereion or thorax, 
gave the creatures a subglobose aspect, at the first glance not a 
little resembling that of a folded Spheromid. In point of fact, 
however, their affinities seem to be with the genus Dexamine, 
Leach. The superior antenne have the first joint stout, the 
second more slender and twice as long, the third not differing 
from the following articulations of the flagellum. In the 
lower antenne only two of the joints of the peduncle could 
be made out distinctly, being probably the penultimate and 
