920 Transactions of the Society. 



Biscorhina hiconcava, Siddall, 1878, Proc. Chester Soc. Nat. Sci., pt. ii. 

 p. 50. 

 Estuary of the Dee (Siddall). 



Planoebulina, d'Orbigny. 

 Planorhidina mediterranensis, d'Orbigny. 



Planorbulina mediterranensis, d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. 

 p. 280, No. 2, pi. xiv. figs. 4-6 ;— Modele, No. 79. 

 „ vulgaris, Williamson, 1858, Eec. For. Gt. Br., p. 57, pi. v. 



figs. 119, 120. 

 Grenerally distributed. 



Tkunoatulina, d'Orbigny. 

 Truncatulina refulgens, Montfort, sp. 



Cihicides refulgens, Montfort, 1808, Conchyl. System., vol. i. p. 122, 



31^ Genre. 

 Truncatulina refulgens, Brady, 1865, Nat. Hist. Trans. Northd. and 



Durham, vol. i. p. 105, pi. xii. fig. 9. 

 Not uncommon in coarse rough sands, from 20 fathoms downwards, 

 on the Atlantic coasts of Scotland and Ireland ; rare on the east coast. 



Truncatulina lohatula, Walker and Jacob, sp. 



Nautilus lobatulus, Walker and Jacob, 1798, Adams's Essays, Kan- 



macher's ed., p. 642, pi. xiv. fig. 36. 

 Truncatulina lohatula, Williamson, 1858, Piec. For. Gt. Br., p. 59, pi. v. 

 figs. 121-123. 



One of the commonest British species. 



Specimens closely resembling a compact many-chambered variety of 

 Truncatulina, recently described by Messrs. Parker and Jones and 

 myself in a paper on some Foraminifera from the Abrohlos Bank (Trans. 

 Zool. Soc. Lond., vol. xii., in the press), are common in Mr. Wright's 

 material from south-east of Ireland. This has been named Truncatulina 

 mundula, and the following characters are given for its identification, loc. 

 cit. Morphologically its place is near Tr. haidingerii, or between that 

 species and Tr. ungeriana, its nearest isomorph being Pulvinulina 

 harsteni. 



" Truncatulina mundula, B. P, and J. — Test free, rotahform ; com- 

 posed of about three convolutions, which are evolute on the superior and 

 completely involute on the inferior side ; the outermost whorl of the adult 

 shell consisting of from ten to twelve segments. Superior face sHghtly 

 convex or subconical, generally coarsely perforate, the sutures and 

 periphery marked by thickening of the chamber-walls; inferior face 

 convex, sometimes a little depressed at the umbilicus, perforations 

 inconspicuous, sutures slightly excavated or marked by fine lines only. 

 Diameter g\jth in. (0*42 mm.)." The Irish specimens have rather fewer 

 chambers than above indicated, but otherwise present very similar 

 characters. 



