236 



/. W. Wulk.f. l\.Turt. D. p. 120. DISCORBIS. 

 L. Macff. Ab. p. 34. D. VESICULARIS. Blain t. 5. 



f. 3. Compressed, white or yellowish, with a frosted 

 appearance when much magnified, roundish or inclining 

 to oblong, convex above and flat beneath ; on the first 

 volution are six or seven lobed joints separated by faint 

 crescent shaped lines ; aperture extremely small. Mi- 

 nute, attached to zoophytes. 



L. CONCAMERATA. F. p. 233, SERPULA C. Mont. 



Sup. p. 160. NAUTILUS. DISSIMILIS, Turt. D.p. 120 

 $uborbicular, compressed, flat beneath, slightly convex 

 above, subpellucid, white, with three irregular volutions, 

 the external having about nine glossy and tumid cells 

 of unequal size but usually alternating large and small. 

 Diam. 0,04. ...Devon. Differs from the last by pos- 

 sessing infinitely more minute and numerous cells and 

 in being devoid externally of that frosted appearance 

 exhibited by it under the microscope. 



L. PULCHELLA. DISCORBIS P. Macff. Aberd. p. 

 319. Orbicular, depressed, hyaline white, spiral, of 

 numerous rather small, somewhat oblique regular cells 

 in three and a half turns ; lower surface rather convex, 

 even, glossy ; the margin thin but rounded and very 

 slightly lobate ; the upper surface convex, but with a 



