Nomenclature of the Foraminifera. 339 



line Cristellaria'^, probably fossil. It was "from Sheppei 

 Island : very rare." 



(G-. a.) Fig 68 appears to be a small Nonionina-f, common on 

 our shores, and of world-wide distribution, namely a delicate 

 variety of the N. asterisans oi Fichtel and Moll. Montagu, 

 however, refers to this figure as being the same as that of his 

 "Nautilus depressulus," which is a small Cristellaria. This 

 mistake must have arisen from his finding his specimen mixed 

 up with this little Nonionina in the Boysian collection. The 

 many narrow, curved chambers, the rounded septal face, the 

 sunken septal lines ("many depressed joints"), and the some- 

 what umbilicated spire, unmistakeably distinguish this from 

 Montagu's. 



(G. b.) Fig. 70 is another variety of Nonionina asterisans, with 

 still more sunken joints or septal lines, and with a more open 

 spire. It is common in some littoral sands. Walker found it 

 at the Reculver, — " exceeding rare." 



(H. a.) Fig. 69 is a common form of Truncatulina lohatulttj 

 having the outline of the cells uniform or flush ; the septal lines 

 being merely "furrowed." According to Walker, it was from 

 Sandwich, — "not common." 



Montagu (Test. Brit. Suppl. p. 78) refers to this figure when 

 describing a little Nonionina] and Williamson (Monogr. p. 42) 

 makes it a Polystomella. We believe that they must both be 

 wrong, because in the specimen figured by Walker the two faces 

 are decidedly unsymmetrical. 



(H. b.) Fig. 71 represents the usual lobed form of Truncatu- 

 lina lobatulaX, which is characteristically littoral. Walker found 

 it at Whitstable, — "not common." 



The more even-surfaced shell, fig. 69, is smaller than the last 

 mentioned, and is generally found in deeper water. The raised, 

 smooth, and nearly conical form, known as T. refulgens, I)'Orb., 

 inhabits still deeper zones. These three are few-celled varietal 

 forms of Planorbulina farcta, Fichtel and Moll, sp., and usually 

 attach themselves to sea-weeds and shells. Varied by their greater 

 or less regularity of growth, and by the relative convexity of 

 their cells, these varieties readily run into each other and into 

 the Planorbuline (or Acervuline) forms, of which P. farcta is the 

 type. 



(I.) Fig. 74 is a not uncommon modification of the Vaginulina 

 Legumen of the British coasts. " From Sandwich : exceeding 



* For further remarks on Cristellaria, see Ann. N. H. 185/, xix. p. 290. 



t " From Reculver : very rare." 



X In Ann. N. H. 1859, lii. p. 482, we have shown that the term Serpula 

 nautiloides, formerly thought to have reference to T. lobatula (Ann. N. H. 

 1857, xix. p. 293), belongs to quite another animal. 



23* 



