OF GALWAT. 25 



ARENACEOUS FORMS. 



This class is obsolete, being artificial; the term is only used for 

 convenience. We have already noticed Miliolina fusca^ and 

 shall speak of Textularia gramai among the Textularin^. 



Gaudryina filiformis commences with a triserial, but con- 

 tinues very soon with a biserial arrangement of chambers. This 

 distinguishes it from Textularia biformis, which commences with a 

 spiral turn, otherwise they are alike ; rare. 



Verneuilina polystropha — the arenaceous form of Btdi- 

 mina — a triserial arrangement of sub-globose orange or yellowish- 

 brown chambers. Very common in many places ; rare. 



Haplophragmium Canariense. — x\ lemon or orange-coloured 

 delicate, lustrous, nonionine shell, bilaterally symmetrical, or 

 nearly so ; the last chamber overhanging and the mouth an oval 

 aperture transversely set ; common. 



Haplophragmium globigeriniforme. — Similar in colour and 

 texture to the last species, but smaller, its more globose segments 

 built up somewhat like Globigerina bulloidcs ; very rare. 



Haplophragmium glomeratum (Brady). — Similar to the last 

 in colour and texture, but somewhat fusiform, with long and 

 narrow chambers ; very rare. 



Ammodiscus gordialis. — An arenaceous tube of fine texture, 

 and rich orange or yellow colour, twisted more or less into a knot. 

 It is comparatively frequent, being a rare form. 



Ammodiscus Shoneana, similar to the last in colour and tex- 

 ture. The tube is curled upon an axis into a lengthened sugar- 

 loaf, spiral. It is a minute form. Two or three specimens were 

 bent near the middle ; rare. 



Trochammina squamata. — This brown, fiat form is more or 

 less acute at the inferior margin, and consists of two or three turns 

 of a depressed spiral of chambers, something like a bun with thin 

 edges ; rare. 



Trochammina ochracea. — A variety, with chambers flush 

 above and radiating irregularly, curved, limbate sutures below; rare. 

 We have found several specimens of the species described by 

 Williamson under the name of Rotalina ochracea (" British Fora- 

 minifera," p. 55, Figs. 112 and 113). Parker and Jones, in their 

 revision of Williamson's nomenclature in " Carpenter's Introduc- 

 tion," ascribed the species to the genus Discorbina^ but it is minutely 



