162 ANNALS OF SCOTTISH NATURAL HISTORY 



Macrobiotus hufelandi, C. Sch. (1). Frequent, Duddingston Loch 

 (March 1905), Lochgelly, Midcalder, Roslin. 



Genus MILNESIUM. 



The only known species of the genus (since M. alpigemim, Ehr., 

 has been shown by Richters to be identical with M. tardigradum) 

 occurred in one collection only. 



Milnesium tardigradum, Doy. (2). Boltonmoor, East Lothian, 

 April 1905, abundant. 



Genus DIPHASCON. 



This genus is well represented in the Forth collections. I only 

 know of three species of the genus previously described. Three 

 species occurred in Mr. Evans' collections, and two of these were 

 new, the third being the type species, D. chilense. 



KEY TO THE SPECIES OF DIPHASCON. 



(A) Pharynx nearly round, gullet slender. 



(a) Skin smooth, rods in pharynx 4 or 5 in each row. 



D. chilense (4). 



(b) Skin papillose, embossed, rods in pharynx 3. 



-D. bitllatinn, n.sp. 



(B) Pharynx narrow, gullet wide or slender. 



(c) Gullet slender, pharyngeal thickenings 4. D. scoticum, n.sp. 



(d) Gullet wide, pharyngeal thickenings 3. D. spitzbergensc (6). 



(e) Gullet very wide and short, pharyngeal thickenings 2. 



D. angustatum (7). 



Diphascon chilense, Plate (4). Near Aberdour, Fife, March 1905, 

 one example. 



D. scoticum, n.sp. Figures la to ic. Specific characters. Large, 

 hyaline. Teeth curved, widely divergent, with bearers. Gullet 

 long, slender, flexible portion about as long as the pharynx. 

 Pharynx narrow, twice as long as broad, slightly narrower in 

 front ; thickenings four in each row, the first two elongate rods 

 of equal size, the third a similar but longer rod, the fourth a 

 small nut. Claws, a long and a short in each pair ; the long 

 claw of one pair much longer than that of the other. Like 

 D. angustatum in the narrow pharynx, it differs in having twice 

 as many thickenings in each row and in the long slender gullet. 

 The general form is also different, lacking the decided anterior 

 narrowing of D. angustatum. Size, up to -^ inch = 378^1. 

 Otterston. near Aberdour, Fife, March 1905 (W. Evans); 

 and in moss, Boltonmoor, East Lothian, April. Since found 

 in several localities outside of the Forth Valley. 



