94 ANNALS OF SCOTTISH NATURAL HISTORY 



lacustris should not be accepted as a valid species, because 

 Dujardin, in 1838, figures the animal which he afterwards 

 called M. lacustris with two different types of claws (the dispar 

 and diphascon types), which are not known to occur together 

 on any animal. Prof. Richters, however, accepts it, and ascribes 

 to it only diphascon claws (16). Very similar to M. lacustris 

 (Richters) are Richters' own two species, M, murrayi (15), and 

 M. breckneri (17). After reading the descriptions and studying 

 the figures, I find it difficult to grasp any important distinctions 

 between these three species, except in size. Richters makes 

 lacustris SOQ/Z, murrayi 6oo/z, and breckneri 240/4. But 

 Dujardin in naming his animal lacustris (1851) gives the sizes 

 as between 220 and 250^, just about the size of breckneri. 

 The larger measurement is near enough that of murrayi. All 

 have claws of the same (diphascoti) type, and two rods in the 

 pharynx, which may perhaps differ somewhat in their relative 

 proportions. 



The Scottish examples here recorded as M. lacustris 

 measured about 3oo//,. 



Most of the Macrobioti^ which lay smooth eggs, are 

 deficient in good distinctive marks apart from the claws and 

 pharynx. 



M. macronyx, Duj. (3). Most of the Scottish records under this 

 name doubtless refer to M. dispar, or some related species, as 

 also I believe most other records. The only authentic Scottish 

 marconyx (if we accept the continental identification of it as an 

 animal laying smooth eggs in the skin) is one collected by 

 Mr. Evans near Edinburgh in 1905. 



Unfortunately the pharynx has not been seen, but there is 

 no other species asserted to have dispar claws and smooth 

 eggs. The Edinburgh skin measured 550^, and contained 

 15 eggs of about 6o/j, in long diameter. 



Macrobiotics^ sp. (Plate I., Figs. 2a-zc\ An egg figured in "Scot. 

 Alp. Tard." (7), has since been found in Shetland with the 

 well-grown young. The claws and pharynx are like those of 

 M. crenulatus, Richters (13). Richters, unfortunately, gives 

 no figure of the pharynx of crenulatus, but says it is sufficiently 

 like that of hnfelandii. Scottish examples with the claws of 

 crenulatus have the pharynx shorter and rounder than that of 

 hufclandii, and the gullet narrower. The young squeezed from 

 the egg here figured has such a gullet and pharynx, and the 

 crescent in front of the claws of the fourth leg is already 

 slightly wrinkled. The processes of the egg are like those of 

 hufelandii, but abbreviated, so that the small apical disc is 

 almost sessile on the hemispherical basal portion, which has a 



