

Plate 26 



Smittina excertaviculata, new species 



Figure A: Note convexity of frontal and protrusion of peristome and avicularium. 

 Drawn to adjacent scale. 



Figure B: Primary and secondary orifices. The broad lyrula and one cardelle show, 

 deep into orifice. The distal third of peristome wall formed by distal zooecium. Drawn, 

 to adjacent scale. 



Figure C: Secondary orifice of nonovicelled zoid showing avicularium dipping down n. 

 bit past the peristome. Same scale as figure F. 



Figure D: Growth habit of 5 nonovicelled zooecia showing elevation of the peristomial 

 area, the protruding avicularia, and the dense porosity of the frontal. Drawn to adjacent 

 scale. 



Figure E: Side view of an ovicelled zoid. The characteristic "break" of the avicularia! 

 face into two different planes at the pivot (transverse bar) is evident, as is also the gently, 

 rounded ridge that leads from the avicularium toward the primary orifice. The crescent- 

 shaped, peripheral, nonporous part of the ovicell wall is a bit thicker than the porous part. 

 Ovicells on the paratype are more encrusted, especially in the peripheral area, than on the 

 holotype here shown. Same scale as figure B. 



Figure F: Another ovicelled zoid, drawn from a different angle, is tipped too far back 

 to show the thicker, nonporous peripheral ovicell wall. Peristomial wings encroach upon 

 the ovicell sides. One corner of lyrula barely visible. Drawn to adjacent scale. 



Figure G: A spatulate mandible in place on avicularium. Same scale as figure B. 



Figure H: A nonovicelled zooecium drawn in its entirety. The avicularium does not' 

 extend down quite as far in this zoid as in figures A-C. Same scale as figure A. 



