34 MALACOZOA. CEPHALOPODA. FORAMINIFERA. 



Several specimens found in shell sand from Cruden Bay, 

 sent to me by Mr. Alex. Murray, in November, 1842. 



Nautilus crispus. Linn. Syst. Nat. i. 1162. — Nautilus spiralis 

 geniculis crenatis. Walker. Test. Min. Rar. PI. 3. f. 65. — Nautilu s 

 crispus. Mont. Test. Brit. 187. PI. 28. f. 5. — Nautilus crispus- 

 Flern, Brit.Anim. 228. — Polystornella crisp'a. Larnk. Syst. vii. 625. 



Genus 2. Ncmmulina. Nummuline. 

 Shell discoid, suborbicular, depressed, with a plurilo- 

 cular spire, with complex walls, and arranged in the same 

 plane ; the two surfaces convex, the margin thin. 



1. Nummulina marginata. Margined Nummuline. 



Shell suborbicular, depressed, glossy, convex on one side, 

 conico-convex on the other, yellowish-white, with a very thin, 

 broad margin, separated by a circular groove from the body 

 of the shell ; the internal spiral tube with few volutions. 

 Diameter about a fourth of a twelfth of an inch, height nearly 

 half the breadth. 



Individuals vary a little in form, some being perfectly orbicu- 

 lar, others less so, some with a slight angle. 



Found by me among shell sand, from the Bay of Cruden, 

 sent by Mr. Alexander Murray, in November, 1842. 



Renoidea marginata. Brown, Illustr. PI. 1. f. 25. The re- 

 ferences wrong, the shell indicated by thein being Lagenula 

 marginata, fig. 30, 31, of the same plate. 



Genus 3. Discoebis. 



Shell discoid, spiral, formed of a series of oblique 

 lobiform cells, flattened beueath, convex above ; the upper 

 surface occupied by the last-formed whorl, the partitions 

 of which radiate obliquely from the centre to the margin ; 

 the whorls on the lower disk exposed ; the partitions 

 generally imperforate ; the aperture small. 



1. Discorbis lobatulus. Lobulate Discorbis. 



Shell depressed, spiral, lobed, generally roundish, but diversi- 

 form, convex above, with the centre depressed ; of two or 

 three whorls of oblique oblong or ovate lobes ; the first turn 

 exposed on the lower surface, the last occupying the upper, 

 both surfaces obliquely radiated from the centre by the parti- 

 tions of the cells, which are convex, frosted, and greyish-white ; 



