HIPPOLYTE PAYERI.
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.
HYALONEMA LONGISSIMUM.
Of the group Pycnogonida, our collection contained three varieties, of which two are new.
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.
KORETHRASTES HISPIDUS.