On some new and little-known Arctic S^yiders. 273 the original type. Tt is quite otherwise with the skeleton-spicules. Even their well-chosen name indicates that a similar significance belongs to them as to the bony framework of the Vertebrata. The skeleton-spicules of the Hexactinel-lida form the most conservative part of the body of these characteristic sponges. With extraordinary tenacity they stick to the fundamental type of the sexradiate ; and although in the liighest ramifications of the stem, the Pollakida, many aber-rant forms are produced by reduction of the rays, they can always be referred back to the sexradiate. [To be continued.] XXXV. — On some new and little-hnown Senders from the Arctic Regions. By the Rev. O. P. Cambridge, M.A., C.M.Z.S., &c. [Plate Vni.] The spiders comprised in the following notes have been received at various times during the last few years : — two from Spitzbergen, from the Rev. A. E. Eaton ; others from Mr. E. Whymper, from Xorth Greenland ; and, more lately, those found by Capt. H. W. Feilden and Dr. Hart during the Arctic Expedition in search of the Xortli Pole, in the years 1875-76. Descriptions and notes of four of the species received from Mr. E. Whymper in 1870 (two of them, Erigone Whymperi and Dictyna horealis^ being considered new to science) were printed about six or seven years ago ; but their publication, as part of an intended faunistic work on Xorth Greenland, appears to have been postponed sine die. Of the thirteen species here recorded, five belong to the genus Erigone^ Sav., two to Linypliia^ two to Lycosa^ and one each to the genera Dictyna., Tegenaria, Thanatus^ and Tarentula. Three species of Erigone^ one of Linyphia, the Tegenaria., Dictyna^ and Tarentula appear to be undcscribed. Araneidea. Fam. Dictynides. Gen. DiCTi'NA, Sund. Dictyna horealis^ sp. n. PL VIII. fig. 1. Adult female, length 1^ line, length of the cephalothorax f line; relative length of tlic legs 1, 2 ?, 4, 3.
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