FORAMINIFERA OP THE WEST OF SCOTLAND. 269 



into cusps between the lines of perforations, thus giving a pseudo-beaded (or margariti- 

 ferous) appearance to the inferior surface. In some cases this is accompanied by a 

 radial constriction of the upper surface of the tube corresponding to the thickening of 

 the under surface, giving a superficial aspect similar to Sidebottom's species S. vicipara, 

 var. (S. 190-1, etc., PFD. 1908, pi. i. fig. 11), though in his figure this constriction marks 

 the underside of the shell. 



261. Spirillina obconica, var. carinata, Halkyard. 



Spirillina vivipara, var. carinata. Halkyard, 1889, RFJ. p. 69, pi. ii. fig. 6. 



„ obconica, var. carinata, Heron-Allen & Earland, 1913, CI. p. 108, pi. ix. figs. 6, 7. 

 2 Stations. 



Two good specimens at Stn. 3, and also at Stn. 12. 



Subfamily Eotaliin^;. 

 Patellina, Williamson. 



262. Patellina COrrugata, Williamson. 



Patellina curruyata, Williamson, 1858, RFGB. p. 40, pi. iii. figs. 86-89. 

 „ „ Brady, 1884, FC. p. 634, pi. kxxvi. figs. 1-7. 



21 Stations. 



Almost universally distributed, often very abundant. There is remarkably little 

 variation, nearly all the specimens being of the circular type. The oval form figured 

 by us from Clare Island (H.-A. & E. 1913, CI. p. 109, pi. ix. fig. 11) occurs at several 

 Stns. There is also a tendency to excessive carination in a few instances. 



Discorbina, Parker & Jones. 



263. Discorbina nitida (Williamson). (Plate 42. figs. 26-30.) 



L'otalina nitida, Williamson, 1858, RFGB. p. 54, pi. iv. figs. 106-108. 

 Discorbina nitida, Sidebottom, 1904, etc., RKD. 1'jOS, p. 13, pi. iv. fig. 6. 



19 Stations. 



Almost universally distributed and often very common. This is one of the commonest 

 Discorbinoe of the ' Puna' gatherings, and, as such, presents endless variations. Excep- 

 tionally large individuals at Stns. 3 and 10. Specimens running into D. praegeri 

 owing to the presence of a central umbilical stud, and into D. rosacea through the 

 presence of small asterigine chamberlets, occur at many Stns. At Stns. 10 and 20 a few 

 individuals of a type with somewhat inflated and enclosing chambers, which we figure 

 (figs. 29, 30) : this variety is characterized by a lobulate periphery instead of the sharp 

 peripheral keel typical of the species. At Stn. 20 a few individuals were observed of a 

 very curious type, which we also figure (fins. 2G-2S), having a comparatively high dome 

 with a prominent megalospheric primordial chamber and a broad carinate periphery. 



SECOND SERIES. ZOOLOGY, VOL. XI. 41 



