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Lunariuni — a more or less thickened portion oi the posterior 

 wall of the cell in many Pabvozoic Bryozoa, which is 

 lunate or cnrved to a shorter radius, and usually projects 

 above the plane of the cell aperture. 



Lunule — the de])ression in front of the beak of Pelecypod 

 shells. 



Macerate — softening and disintegrating by immersion in 



water. 

 Macuhe — irregular, usually depressed, areas on the cellulif- 



erous face of a Bryozoan frond, which are free from cells, 



or otherwise differentiated. 

 ^[esin 1 — cen tr al . 

 Mesogluea, — the central, non-cellular layer in the body of 



Coelenterates. 

 Meso-pores — irregular meshes, or cysts, on the intercellular 



spaces of certain Bryozoa. 

 Mesotlieca, — a median wall separating opposed cells in cer- 

 tain Bryozoan fi-onds. 

 Mold — Any impression of a fossil, in rock matrix, whether 



external or internal. 

 Moniliforni — resembling a necklace or string of beads. 

 Monticules — elevated areas on the surface of certain coral and 



Bryozoan colonies, commonly carrying larger apertures. 

 Mucronate — produced into a long pointed extension. 

 Mural pores — the pores in the walls of the corallites of the 



Favositida3. 



Nacreous — pearlv; the nacreous layer of shells is the inner 



smooth pearl}^ layer. 

 Nnsute — projecting, nose-like. 



Node — a knob ; usually considered as ornamental. 

 Nodose — bearing nodes or tubercles. 



Obconical — inversely conical. 



Occipital — applied to the posterior part of the cephalon of 

 a Trilobite. 



