DE. H. J. HANSEN ON THB ING0LFIELLIDJ3. 117 



EXPLANATION OF PLATE 13. 



cy«= contractile vacuole. M=nucleus. jos=pseudopodia. ■?;=Tacuole. 

 All the figures X 520. 



Figs. 1-2. Bactylosjilimrium radiosum, Blochmann. Two forms ; fig. 2, 

 showing spirally-twisted pseudopodia. 

 3-6. Hyalosjiheiiia platystoma, sp. n. Figs. 3-5 showing the front view 

 of the shell with its broad aperture ; fig. 6, seen from the side- 

 Fig. 4 shows a curiously contracted state of the animal in which 

 the body-protoplasm is closely applied to the dorsal part of the 

 shell. 



7-11. Hyalosplienia inconspictia, sp. n. Fig. 7, living animal, showing 

 pseudopodium and nucleus ; figs. 8-11, empty shells. Fig. 11 

 is the basal view of a shell showing the elliptical mouth. 



12-15. Sjphenocleria pulchella, sp. n. Figs. 12, 14, and 15, empty shells ; 

 fig. 13, living animal. Fig. 15 is the basal view of the shell, 

 showing the small, round aperture. 



16-19. Nuclearia conspictM, sp. n. Figs. 16 and 17, animals with pseudo- 

 podia extended ; fig. 18, contracted state of the animal. These 

 animals contain a number of Desmids, the bodies of which 

 have been more or less digested. Fig. 19, two pseudopodia after 

 slight mechanical stimulation. 



Tlie IngolfiellidcB, fara. n., a new Type of Ampliipoda. 

 By Dr. H. J. Hansen (Copeuhagen), l^.M.L.S. 



[Bead 7th May, 1903.] 



(Plates 14 & 15.) 



The greatest depth explored by the Danish ' Ingolf ' Expedition 

 (during the two summers of 1895 and 1896) was 1870 fathoms, 

 and the Station in question (No. 38) is a little south of the 

 entrance to Davis Strait. In the trawl was obtained slightly 

 more than one litre of mud, which was carefully treated with 

 a sieve covered with silk-gauze. This small portion of bottom- 

 material contained a number of Crustacea new to science, among 

 which were two new aberrant types of very small sessile-eyed 

 Malacostraca. Of one of these forms only a single specimen 

 could be detected ; it presents a rather strong resemblance to 

 the Caprellidae, but it is at once apparent that the pleopods 

 on the long abdomen differ exceedingly from those of every 

 other Amphipod hitherto known. Some years after I found a 

 specimen of an allied species in sieved material procured by 



