Nomenclature of the Foraminifera. 345 



Clay. In the latter this form is abundant. It is the Nodosaria 

 obliqua, Linn, sp., as Montagu thought. D' Orhigny^ s Dentalina 

 acuta is an analogous variety. 



{B.C.) PI. 14. f. 5, p. 199. " Nautilus costatus.^' The figure 

 shows a straight and few-ribbed variety of Nodosaria Raphanus, 

 This also is most probably fossil. 



(D. d.) Supplem. pi. 19. f. 2, p. 83. '^ Nautilus costatus, var." 

 A fragment of a straight symmetrical Nodosaria. In describing 

 this variety, Montagu correctly remarks that this form is '' sub- 

 ject to very great variation.^^ Probably fossil. 



(D. e.) PI. 14. f. 1, p. 525. " Vermiculum Urn«." " Found in 

 sand from Sheppey.^' Probably the first cell of a Nodosaria 

 (from the London Clay of Sheppey), showing the fractured wall 

 of the next or second cell, encircling the base of the conically- 

 produced septal face. The opposite, or lower, projecting point 

 is the usual-terminal pricklet. 



(D./.) PI. 6. f. 5, p. 198. "N. subarcuatus.'^ One of the 

 innumerable Dentaline modifications of Nodosarice. Montagu 

 mentions having seen a drawing of another variety. Both were 

 from Sandwich. The '^ brown epidermis^^ may probably have 

 been due to fossilization. 



Several varieties of these delicate tapering shells abound in 

 the Tertiary clays (the cliff-washings of which afforded Boys and 

 Walker so many Foraminifera) ; and some occur recent on our 

 coasts, though they are neither large nor plentiful. In the 

 Mediterranean and elsewhere they abound on deep mud bot- 

 toms. Authors have noticed and figured hundreds of the varie- 

 ties, recent and fossil, as distinct species. D^Orbigny's Dentalina 

 communis (from the Adriatic, and fossil in the Chalk) has the 

 chambers oblique and distinct, and is a good sub-type; but 

 LamarcVs older name, Nodosaria dentalina (An. s. Vert. vii. 

 p. 596, no. 2) is well adapted for this group. Montagues spe- 

 cimen, above referred to, has the septal lines of its earlier seg- 

 ments unmarked, and the later chambers are globose. 



Prof. Williamson has taken Montagues "N. subarcuatus '^ as 

 the type of the Dentaline group. In this we cannot agree; for 

 we do not regard this shell as a good typical form. The well- 

 grown specimens of Dentalina communis {N. dentalina) of the 

 Adriatic and Mediterranean far better represent the characters of 

 the slender tapering arcuate Nodosarice furthest removed from 

 N. Raphanus. 



(D.ff.) P. 197, and Supplem. pi. 19. f. 4 & 7, p. 82. " Nau- 

 tilus rectus.^^ At p. 197, N Legumen is described under this 

 name : but in the " Supplement these forms are separately and 

 correctly defined. Montagues N. rectus is a thickish and nearly 

 straight form of Nodosaria dentalina, very common in the Lon- 



