ON THE TARDIGRADA OF THE SOUTH ORKNEYS. 31 



The furcate process has some resemblance to that of M. furcatus, but the larger base 

 and the definite form of the leaflets leave no doubt that it is distinct. Very few 

 examples were seen. 



Macrobiotus, sp. ? (Plate IV. fig. 16.) 



Known only from the egg, which closely resembles the last (fig. 15), of which it is 

 possibly a variety. The egg is of the same size, and has processes likewise consisting of 

 a hemispherical base and bifid process. The differences are that the basal part is 

 relatively much larger, and that the divisions of the bifid portion are rounded instead of 

 pointed. 



Macrobiotus, sp. ? (Plate III. figs. 10a to 10ft.) 



Description. Claws of the hufelandi type, but, like M. furcatus, the supple- 

 mentary points are stronger, pharynx round, two nearly equal rods in each row, each 

 about three times as long as broad, teeth curved, no bearers seen. 



A large smooth-skinned animal, reaching to 520 M in length. It may be only a 

 variety of M. furcatus. The structure of the pharynx is sufficiently distinct, but this 

 is subject to variation in some species at least, as RICHTERS' M. echinogenitus (see Fauna 

 Arctica (13)). As there are two spiny eggs unaccounted for, the probability is that 

 this is the animal that lays one of those. 



One pair of claws is larger than the other, which is unusual with claws of the 

 hufelandi form. 



Macrobiotus, sp. (Plate III. figs. 9a to 9b.) 



Description. Claws quite like the last, of the hufelandi type, but with stronger sup- 

 plementary points and one pair larger than the other. The pharynx also, like the last 

 (fig. 10a), has two rods in each row. The differences are that the pharynx is elliptical 

 instead of round, and the first rod of each row is longer, narrower, curved, and thinned 

 close to the end of the gullet. 



B. EGGS SMOOTH, LAID IN THE MOULTED SKIN. 



Macrobiotus asperus, n. sp. (Plate II. figs. 5a to 5e.) 



Specific Characters. Large, dark brown. Claws in two similar pairs, joined only 

 near the base, one member of each pair much longer than the other, and with fine 

 supplementary point. Teeth curved, with bearers. Pharynx nearly round, with three 

 short rods in each row of thickenings ; rods nearly equal, about twice as long as broad, 

 the first a little shorter. Skin covered on back and sides with somewhat large tubercles, 

 irregularly scattered ; ventral side and legs smooth. Eyes dark. 



(ROT. soc. EDIN. TRANS., VOL. XLV., 329.) 



