0)1 some new and little-hnown Arctic Sjyiders. 273 



the original type. It 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 

 highest ramifications of the stem, the Pollakidte, 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-hnoion Spiders from the 

 Arctic Regions. By the Kev. 0. 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 Spifczbergen, from the Rev. A. E. Eaton ; others from 

 Mr. E. Whymper, from North Greenland ; and, more lately, 

 those found by Capt. H. W. Feilden and Dr. Hart during the 

 Arctic Expedition in search of the North 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 North Greenland, 

 appears to have been postponed sine die. Of the thirteen 

 species here recorded, five belong to the genus Erigone^ Sav., 

 two to Linyphia, two to Lycosuj and one each to the genera 

 Dictyna^ Tegenaria^ Thanatus^ and Tarentula. Tliree species 

 of Erigone, one of LinypMa, the Tegenaria, Dicfyna, and 

 Tarentula appear to be undescribed. 



Aeaneidea. 



Fam. Dictynides. 



Gen. Dictyna, Sund. 



Dictyna horealis, sp. n. PI. VIII. fig. 1. 



Adult female, length 1| line, length of the cephalothorax 

 I line ; relative length of the legs 1,''2 ?, 4, 3. 



