The group of Amphipoda was, comparatively, largely represented among the Crustacea of the Arctic waters; we often called these _Floh-krebse_—flea-crabs—because many of them used their hind legs to hop along. Eleven species of this genus were brought home in our collections; among these were _Amathillopsis spinigera_, a new species, _Cleïppides quadricuspis_, also a new species, both described by Professor Heller; _Acanthozone hystrix_ (Owen), &c. The group—Isopoda—is represented by the interesting _Munnopsis typica_ (Sars), the _Idothea sabini_ (Kröyer), and by a new variety, _Paranthura arctica_. [Illustration: HYALONEMA LONGISSIMUM.] Of the group Pycnogonida, our collection contained three varieties, of which two are new. [Illustration: UMBELLULA.] Sponges were common; but we were obliged to leave behind the specimens of the larger kinds on account of the room they took up. Among the silicious sponges, those of the genus Hyalonema were the largest in size, and included the forms described as _Hyalonema boreale_ (Lovèn), and _Hyalonema longissimum_ (Sars). There was one specimen of the horny sponge, so rare in those parts. The drag-net often brought up _Actiniæ_, _Bryareum grandiflorum_ (Sars), and June 2, 1873, from a depth of 110 fathoms, a specimen of the extremely rare _Umbellula_ described by Mytius and Ellis, 1753. Since that date this animal had been lost sight of, until it was found again by the Swedes—Gladans expedition 1871—in Baffin’s Bay, and by the _Challenger_, 1873, between Portugal and Madeira and between Prince Edward’s Island and Kerguelen’s Land. It may be assumed that our Umbellula is identical with the form first described, 1758, by Linnæus as _Isis encrinus_. I regret to say that this, the most interesting of all the objects we had collected, was left behind in the _Tegetthoff_. The sketch of it made from life will facilitate a comparison with the forms known in other regions and variously named. [Illustration: KORETHRASTES HISPIDUS.] [Illustration: NEPHTHYS LONGISETOSA.] Hydroid polypes, widely distributed in several varieties in the Atlantic Ocean,—_Asteridæ_ and _Ophiuridæ_, the _Korethrastes hispidus_ (Wyv. Thomson), a new variety discovered by the _Porcupine_ expedition between the Faroe and Shetland islands, _Crinoidæ_, represented by two species never before found so far north, and several _Holothuriæ_, were also among the acquisitions brought home. Our collection was rich in _Annelides_, containing seven-and-twenty varieties found in Greenland and Spitzbergen. Fourteen varieties of _Bryozoa_ were found, and single specimens of _Turbellaria_ and _Gephyrea_. CHAPTER VII. THE SECOND SLEDGE EXPEDITION.—AUSTRIA SOUND.