THE TARDIGRADA OF THE FORTH VALLEY 161 



stages of growth, has been described several times over 

 under different names. The study of the Tardigrada has 

 been greatly neglected till quite recently. The only modern 

 systematic works of any extent being Plate's monographic 

 study (4), 1889, and Richter's numerous papers. There 

 can be no doubt that with further work the list of Tardigrada 

 of the Forth valley could be greatly extended. They are 

 to be found, it may be mentioned, chiefly among damp 

 moss, and on such water plants as Elodea canadensis. 



Figures in brackets in the text refer to the short biblio- 

 graphical list at the end. 



LIST OF SPECIES. 

 Genus ECHINISCUS. 



Besides the five species included in the list, several others were 

 seen, but as they were immature they could not be named. 



Echiniscus arctomys, Ehr. (3). Nether Habbie's Howe, Pentland 

 Hills, March 1905, one example. 



E. mutabilis, Murray (7). Cobbinshaw Moor, April 1905, type, 

 two eggs. 



E. wendti, Richters (6). Nether Habbie's Howe, Pentland Hills, 

 March 1905, several. 



E. granulatus, Doy. (2). In moss (Lei/codon] off tree, Rosebery, 

 Midlothian, February 1905; the one example found differs 

 from the type of the species in lacking the little spine at the 

 junction of the tail-piece with the lumbar plate, but being 

 otherwise typical I see no reason for separating it. 



E. spitzbergensis, Scourfield (5). In moss, Howgate, near Penicuik, 

 3oth March 1905. This example agrees with Scourfield's 

 description and figure in the number and arrangement of the 

 plates and spines. The second pair of dorsal spines are, 

 however, much longer. The texture of the plates offers a 

 peculiarity, also found in all the Loch Morar examples ; the 

 pattern appears to consist of large rings with open (perforate) 

 centres, instead of the coarse granules seen by Scourfield. I 

 believe these apparent rings arise by some change of the 

 granules. Living examples have not yet been seen in Scotland. 



Genus MACROBIOTUS. 



Only one species of the genus could be named. Cast skins of 

 one or two other species, containing eggs, were found, but without 

 seeing the teeth and pharynx they could not be identified. 



55 D 



