ON ARCTIC TARDIGRADA. 073 



The 2 species named were Echiniscus spitsbergensis, var. spinuloides, and 

 Macrobiotus echinogenitus. The third was only known from an egg, which had 

 hemispherical processes (Plate I. fig. 4). This egg is like one figured in " Scottish 

 Alpine Tardigrada " (6), Plate III. fig. 10, but the Arctic egg is very much larger than 

 the Scotch one. These eggs answer the description of " raspberry-form " given by 

 Doyere to the eggs of his M. oberhduseri, but no sufficiently developed young has been 

 seen in them. 



Bear Island. 



In the single collection taken here the only Tardigrade found was Macrobiotus 

 annulatus, Murray. The single example seen had the typical skin, claws, and pharynx, 

 but it was not carrying eggs. M. ornatus, Richters, is the only other species which 

 I find recorded for Bear Island. 



Notes on the Species. 

 Genus Echiniscus. 



E. arctomys, Ehr. (2). — A widely distributed species, ranging from Franz Josef 

 Land to Kerguelen. 



E. mutabilis, Murray (4). — The spines on the inner claws were seen in all the 

 examples recorded. 



E. wendti, Richters (11). — Examples from Franz Josef Land had the long head 

 seta blunt and slightly expanded at the tip. 



E. spitsbergensis, Scoureield (15). — Somewhat variable in the length of the processes, 

 especially of the second dorsal process (on the second paired plates). The most 

 divergent variety is described below. In all the localities where the variety was found 

 the type was also present. 



Var. spinuloides, var. nov. (Plate II. figs. 8« to 8c) : — 



Distinctive Characters. — There are little sublateral spines on four segments (II., 

 III., IV., and VI.) as in E. spinulosus, Doy. (1), and E. oihonnse, Richters (11). The 

 second dorsal process is an elongate curved spine with very broad flat base. 



The pattern of the plates consists of large hexagonal marks, which do not appear to 

 stand above the general surface, and enclose each an obscure round mark. There is a 

 blunt palp on the fourth leg. Length, 284/x. Claws, 32/*. Eggs up to five in the 

 cast skin. 



Franz Josef Land and Novaya Zemlya. A very similar variety is frequent in 

 Scotland, but the spinules have not been seen. These are, however, often difficult to 

 detect. 



