SCOTTISH TARDIGRADA, COLLECTED BY THE LAKE SURVEY. 659 



than in hastatus, the processes very short round-topped rods. The egg might suffici- 

 ently fit Doyere's description of " mulberry-form " but for the exceeding minuteness 

 of those rods. Looked at from above, they look like pellucid dots (see figs. 27a, 27c?). 



M. sp. ? (6). 



The Macrobiotus erroneously recorded as M. islandicus (6) appears to be related to 

 M. oberhauseri. It has claws of the same type, and pharynx with the same number of 

 thickenings, but two of these are rods instead of nuts. The eggs are smooth, and four 

 have been seen laid in the skin. The stomach cells are usually filled with dark blue 

 granules, but these may be absent. 



It appears to be distinct from any described species, but further study is needed. 

 Common at lake margins. 



M. zetlandicus, sp. n. (Plate IV. figs. 24a to 24a 7 .) 



Specific characters. — Large, brown. Teeth straight, very stout, furca of large 

 lobes; pharynx of the oberhauseri type, with all the three .thickenings in each row 

 short and broad, the second and third deeply two-lobed on outer side ; claws also of 

 oberhauseri type, all large and strong, the longest with two supplementary points ; 

 eggs elliptical, laid in the skin. Eyes dark. 



Length up to 580/*, claws 3(V, egg 94/x by 75«. 



Living young have been seen in the body of the parent, but as eggs are usually 

 laid I do not think we have in this species any exception to the rule throughout the 

 order. I rather suppose that some malformation has prevented the deposition of the 

 eggs, which were retained till hatched. 



The deeply-lobed rods distinguish it from all known species. Bog pool, Fort- 

 Augustus, 1905 ; Shetland, abundant, 1906 ; Spitsbergen (W. S. Bruce), 1906. 



M. macronyx, Duj. ? 



All the various Scotch records for this species are open to doubt. It has been 

 found that the animal so identified has spiny eggs (see M. dispar, below), and cannot 

 therefore be M. macronyx. In the Forth area (10) a skin was found containing 15 eggs, 

 and with claws like those of M. macronyx, but the pharynx was not seen, so the identi- 

 fication is not complete. 



M. tuberculatus, Plate (13). (Plate IV. figs. 24a to 24c.) 



Plate's description is very meagre and unsatisfactory. More than one form with 

 similar tubercles is known. Plate says there are 2 rods in the pharynx, and figures 

 3. A Spitsbergen form has a nut and 3 short rods, without "comma." The Shetland 

 form has only 2 short rods and a comma. I have no doubt these are distinct species. 



The example from Loch Morar was a simplex form. The claws are very divergent. 



