228 MESSES. E. HERON-ALLEN AND A. EAELAND ON THE 



94. Trochammina squamata, Jones & Parker. 



Trochammina squamata, Jones & Parker, I860, RPM. p. 304, table. 

 „ Brady, 1884, FC. p. 337, pi. xli. fig. 3 a, b, c. 



17 Stations. 



Almost universally distributed, often fairly common. There is a considerable amount 

 of variation observable at different Stns. At the majority the specimens were rather 

 small and were grey in colour. Large darkly ferruginous specimens occur at several 

 Stns., notably at Stns. 3 and 10. A double specimen was found at Stn. 3. 



95. Trochammina rotaliformis, Wright. 



Trochammina inflata (Montagu), var. (Wright, MS.), Balkwill & Wright, 1885, DIS. p. 331, pi. xiii. 

 figs. 11, 12. 

 „ rotaliformis, Heron-Allen & Earland, 1913, CI. p. 52, pi. iii. figs. 11-13. 



10 Stations. 



Fairly widely distributed and often not uncommon. There is a considerable amount 

 of variation, especially in the texture of the shell, some being quite coarsely arenaceous, 

 whilst others, notably at Stn. 3, are almost entirely composed of polished ferruginous 

 cement giving a very smooth and regular outline to the shell. 



96. Trochammina nitida, Brady. (Plate 40. figs. 19-21.) 



Trochammina nitida, Brady, 1881, HNPE. p. 100. No. 25. 

 „ Brady, 1879, etc., ItRC. 1881, p. 52. 



Brady, 1884, FC. p. 339, pi. xli. figs. 5, 6. 



1 Station. 



A single specimen of this rare type, which we figure, from Stn. 12. It differs slightly 

 from Brady's type in the greater number of chambers in the final convolution — ten, as 

 against nine in the type. The central spire is somewhat depressed on the superior side. 

 Colour dark brown, texture very finely arenaceous. T. nitida, according to Brady, 

 is typically an arctic species, but Millett records it from shallow water in the Malay 

 Archipelago (M. 1898, etc., FM. 1899, p. 363). 



97. Trochammina robertsoni, Brady. 



Trochammina robertsoni, Brady, 1887, SBRF. p. 893. 



„ „ Wright, 1891, SWI. p. 469, pi. xx. fig. 4. 



15 Stations. 



Fairly widely distributed, often common, the only variation being in the size. This is 

 one of the most typical West of Scotland species. 



