36 MALACOZOA. CEPIIALOrODA. FOnAMIMFERA, 



the opposite direction, is considered by some as a distinct 

 species, and bv others as a sinistrorse variety of Rotaha Beccarii. 

 I have fonnd it on shells and Flustrce from deep water, but it is 

 very micommon Avith us. 



Genus 5. Spikoloculixa. SpirvOLOCULiXE. 



Sliell sub orbicular, depressed, vith the cells curved 

 and opposed to each other iii a single plane, and com- 

 pletely exposed, or not embracing each other ; the aper- 

 ture roundish at one end of the last turn. 



1. Spiroloailina concentrica. Concentric SpiroIoeuUne. 



Shell elliptico-orbicular, depressed, concave on both sides, 

 very thin, of about five opposite arcuate cells, distinctly sepa- 

 rated by a groove ; the outer cells externally flattened, or 

 slightly convex ; the colour white, generally with two brown or 

 blackish streaks on each turn ; the aperture nearly square, 

 with an erect tooth-like process, and thick brown margin. 

 Diameter nearly half the twelfth of an inch. 



The centre is frequently perforated, but apparently from 

 accident. 



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

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



Miliola concentrica. Brown, lUustr. PI. 1. f. 22. 



Genus 6. Yermiculum. 

 Shell roundish, depressed, of few cells, which are alter- 

 nately folded upon each other ; the aperture at the end 

 of that last formed. 



1. J'ermicuhnn suhrotiindiim. Roundhh VermlcuJum. 



Shell orbicular, depressed, flat beneath, of three smooth, 

 gloss}', opaque, white turns, of which the last two are incurved 

 and margin the disk, the first running across its centre ; their 

 upper surface convex, the anterior end rounded, with the mouth 

 depressed, oval, toothless. Diameter about a fourth of the 

 twelfth of an inch. 



Found by me adhering to an old cockle, from deep water 

 off Aberdeen, 28th September, 1842; in October, by Mr. 

 Alexander Murray, at Fraserbiu'gh, and iu Cruden Bay. 



Seiinila subrotuuda dorse elevato. Walker, Test. INIin. Rar. 

 PI. ]. f. 4. — Yermiculum subrotundum- Mout. Test. Brit. o21. — 

 Yermiculum subrotundum. Flem. Brit. Anim. 234; ^^'crn. Mem. 

 iv.565. PI. 15. f..5. 



