PLATE XXVI. 



Nebda carinata (Archer) Leidy. (p. 105) 



Pigs. 



1-11. A range of forms from different localities showing 

 the extent of variation in this species. Fig. 1. — 

 Broad view of a living individual in Sphagnum from 

 Aherfoyle, Scotland, apparently the most common 

 form in the Highlands. Figs. 2-4. — A form abundant 

 about Llyn Idwal^ N. Wales, and in other sub-alpine 

 Welsh localities, marked by a carina of uniform 

 thickness : 2, broad view, and 4, dorsal view of a 

 living example; 3, narrow view of an empty test. 

 Figs. 5-7. — Broad and narrow lateral views and 

 dorsal view of a living example inflated in outline 

 laterally ; from Dunham, Cheshire. Fig. 8. — Broad 

 view of a variant of the same form, encysted ; from 

 Towyn, N. Wales. Figs. 9-11. — Broad and narrow 

 lateral views and dorsal view of a rotund form, 

 living, from Dunham. x 280. 



