TARDIGRADA: CANADA 173 



Macrobiotus tuberculatus, Plate (23) 



Habitat. Victoria, British Columbia. 



The examples were rather larger than the average, but not so large as M. nodosus. 

 They were colourless, and the knobs did not show on the outline in dorsal view. 



Macrobiotus sattleri, Richiers (26) 



Habitat. Rocky Mountains. 



M. sattleri is either variable in the characters of the pharynx, or there are several 

 forms which have the same peculiar skin-markings. 



One form has three short rods in the pharynx. The Australian form (see p. 141) 

 has two unequal rods. The Canadian form has two equal rods, each about four times 

 as long as broad. No comma was seen. The pairs of claws are unequal, and the 

 claws of the larger pair are united for a short distance above the base. 



Macrobiotus, sp. ? 



Four eggs in a skin of 200 M in length. Eggs smooth, of about GO n by 45 M. Claws 

 Vs, equal pairs of equal claws, joined at the base only. 



Without knowledge of the pharynx identification is not possible. It is certainly 

 different from any of the species recognised. The claws prove that it is not a 

 Diphascon. 



D : EGGS UNKNOWN 

 Macrobiotus virgatus, sp. n. (Plate XXI. Figs. 55a-55c) 



Specific characters. Large and robust ; pigmented with a warm brown colour 

 arranged in longitudinal bands ; gullet very wide, and teeth strong ; pharynx 

 shortly oval, with apophysis, and two rods and a nut in each row, the nut between 

 the two rods ; dark eyes ; claws very thick, of the hufelandi type, very unequal, 

 united for half the length of the longer one, which bears two thick supplementary 

 points. 



Detailed description. Length, up to 750 /j.. The colour is a warm brown, not 

 unlike that of M. oberhciuseri, but less inclined to purple. It is arranged in three 

 principal longitudinal bands, one median and two lateral. These latter may be 

 subdivided into narrower bands, and there are some thin transverse bands. 



The gullet is as much as 9 or 10 M in diameter. The teeth penetrate its wall at 

 about the middle of its length. The end of the gullet in the pharynx has a slight 

 projecting rim. The rods are of unusual proportions the first and third are about 

 four times as long as broad, the second varies from little longer than broad to twice 

 as long as broad. 



