FORAMINIFEKA OP THE WEST OF SCOTLAND. 247 



170. Lagena lyellii (Seguenza). 



Amphurina lyellii, Seguenza, 1862, FMMM. p. 52, pi. i. fig. 40. 



„ coslata, Seguenza, ibid. fig. 41. 



Lagena lyellii, Heron-Allen & Earland, 1913, CI. p. 79, pi. vi. fig. 8. 



7 Stations. 



Occurs at few Stns., but plentifully at Stns. 2, 4, and 18. The majority of the speci- 

 mens at all the Stns. are of the oval form represented by Seguenza' s species L. costata 

 (ut supra) rather than the spherical L. lyellii. 



171. Lagena williamsoni (Alcock). 



Entosolenia williamsoni, Alcock, 1865, NHC. p. 195. 



Lagena williamsoni, Balkwill & Wright, 1885, DIS. p. 339, pi. xiv. figs. 6-8. 



22 Stations. 



Almost universally distributed, often very common, the best specimens at Stns. 7 

 and 8. At many other Stns. the specimens are rather small, obscure in their reticulate 

 neck-markings, and sometimes distorted. 



172. Lagena acuticosta, Reuss. 



Lagena acuticosta, Reuss, 1862, FFL. p. 331, pi. v. fig. 63. 



Brady, 1884, FC. p. 464, pi. lvii. figs. 31, 32, pi. lviii. figs. 20, 21. 



8 Stations. 



Less widely distributed and less abundant than L. williamsoni, except at a few Stns. 

 None of the specimens present the very salient ridges found in deep-water examples, but 

 at the same time the specimens as a whole are well and strongly marked, though varying, 

 especially at Stn. 10, in the prominence of the costse. L. acuticosta and L. ivilliamsoui 

 must be extremely closely allied, for practically the only recognizable distinction between 

 the two forms lies in the fact that the neck in L. acuticosta is a solid cone of shell- 

 substance, while in L. williamsoni this cone is more or less covered with hexagonal pits. 

 Why the test with a solid neck should be more or less confined to deep water, while the 

 reticulate type has its habitat in shore-sands, is one of those puzzling problems of distri- 

 bution which baffle the student. 



173. Lagena StriatO-punctata, Parker & Jones. 



Lagena sulcata, var. striato-punctata, Parker & Jones, 1865, NAAF. p. 350, pi. xiii. figs. 25-27. 

 „ striato-punctata, Brady, 1884, FC. p. 468, pi. lviii. figs. 37, 40. 



1 Station. 



A single specimen at Stn. 4, chiefly noteworthy because it is not of the feeble type 

 with few costae such as is usually found in British gatherings, but of a strong multi- 

 costate type such as is usually confined to tropical waters. Messrs. Balkwill and Wright, 

 however (B. & W. 1885, DIS. p. 339, pi. xiv. fig. 20), figure a similar specimen from 

 the Irish Sea. 



38* 



