malacozoa. cephalopoda. foraminifera. 39 



Genus 9. C(ecalium. 

 Shell cylindrical, more or less arcuate, of one cell, 

 closed at one end, open at the other. 



1. Ccecdlium gldhrum. Smooth Ccecalium. 



Shell cylindi-ical, very slightly narrowed downwards, a little 

 arcuate, of a single cell, very thin, transparent, smooth, glossy, 

 iridescent, or opaline white, rounded at the low^er end, open at 

 the otlier, with the aperture circular. Length one-tw^elfth, 

 hreadth nearly a fovuth of the length. 



Several specimens among small shells sent hy Mr Alex. 

 Murray, who found them at Fraserburgh, in October, 1842. 

 Many others found by me among shell sand, from the Bay of 

 Cruden. 



Dentalium glabrum. Mont. Test. Brit. 497. — Brochus glabev. 

 Brown, Illustr. PI. 1. f, 3. — Orthocera glabra. Flem. Brit. Anim. 

 237.— Ccecum glabrum. Flem. Edinb. Encycl. vii. 67. PI. 204. f.7. 



2. CoecdUum imperfordtum. Imperforated CoecaUinn. 



Shell cylindrical, arcuate, glossy, finely and obsoletely stri- 

 ated transversely, of a single cell, rather thick, somewhat 

 pellucid, white or greyish, closed and truncato-convex, or 

 hemispherical at the low^er end, open at the other, with the 

 aperture round, and having a thin, slightly contracted margin. 

 Length an eighth of an inch, breadth about a fifth of the length. 



This species is considerably larger than Ccecalium glabrum, 

 from which it differs in being annulated with delicate striae. 



Found by me in shell sand, from the Bay of Cruden, sent 

 by Mr. Alex. Murray, in November, 1842. 



Dentalium imperforatum. Mont. Test. Brit. 496. — Dentale 

 apice imperforata transversaliter substriata. Walker, Testae Mini 

 Rar. PI. 1. f. 15. — Orthocera imperforata. Flem. Brit. Anim. 237. 



3. CoecdUum Trachea. 



Shell subcylindrical, arcuate, annulated, or marked with cir- 

 cular strise, and intervening convex rings, of a single cell, 

 very thin, semitransparent, glossy, white or brownish, closed 

 and truncated at the lower end, open at the other, with the 

 aperture circular. Length a twelfth and a-half, or a little 

 more, breadth about a fifth of the length. 



Found by me in shell sand, from the Bay of Cruden, sent 

 by Mr. Alexander Murray, in November, 1842. 



Dentalium Trachea. Mont. Test. Brit. 497. PI. 14. f. 10.— 

 Orthocera Trachea. Flem. Brit. Anun. 237. 



