674 MR JAMES MURRAY 



Echiniscus bor^ealis, n. sp. (Plate T. fig. l) : — 



Specific Characters. — Large (31(V long) plates fourteen, three pairs; first and 

 second median, each divided into two distinct plates ; third median, single. Spines 

 numerous : lateral, a curved spine on ventral side of head, short curved spines on 

 shoulder plate and first and second pairs, a long seta on lumbar plate ; dorsal 

 processes, a broad-based spine on the first pair, a similar spine and a small tooth on the 

 second pair, a short broad spine on the third pair ; lateral margins of shoulder plate 

 and the three pairs, bearing many small spines, of which those on the third pair are 

 largest. A strong straight spine on outside of fourth leg. Lumbar plate trefoliate. 

 Head seta very long (160/x) ; palp at base triangular, pointed. No barbs on any claws. 

 Fringe of sharp spines. Plates pellucid, dotted ; connecting skin also dotted. Larva 

 two-clawed. 



This very distinct species belongs to that section of the genus in which there 

 is a third pair of plates, after the third median plate. Other species having this 

 peculiarity are E. mutabilis, Murray, E. conifer, E. arctomys, E. islandicus, Eichters, 

 and an undescribed species at which Prof. Richters is now. working. The only one of 

 these which possesses processes on any plates other than the head plate is E, islandicus. 

 The lateral processes are similar in the two species, but the dorsal processes are entirely 

 different, as will be best seen by comparing the figures. E. islandicus has, moreover, 

 the plates quite smooth, and possesses rods in the pharynx. 



The two-clawed young of E. borealis measured 192m, and all the processes of the 

 adult were present. Skins containing three elliptical eggs were found, the eggs 

 measuring 72m by 48m. Franz Josef Land. 



The spines on the first and second pairs of plates occupy an unusual position, being 

 near the median line of the body instead of at the angle as usual. The ventral head 

 seta, the little lateral spines, and the straight seta beside the fringe on the last legs are 

 all unusual processes possessed by no other species. 



As only skins have been seen, it is unknown whether there are rods in the pharynx, 

 as in E. isla?idicus. 



Found only at one station, Cape Mary Harmsworth, Franz Josef Land. 



E. muscicola (9). — This species must be regarded as insufficiently described, 

 as it was not found mature, and several characters necessary to discriminate 

 species are not mentioned. An animal found in Franz Josef Land comes nearest to 

 E. muscicola, but the lateral setae are a, c, d, e, instead of a, b, c, d. This example 

 was also immature. 



Genus Macrobiotus. 



M. oberhduseri, Doy. ? (1). — No pigmented examples were found. An animal got 

 in moss from Prince Charles Foreland agreed with this species in characters of pharynx 

 and claws. 



