Plate 29 



Smillina ordinata (MacGillivray) 



Figure A: Side view of two zoids. Protrusion of peristome and ovicell rim is character- 

 istic. Drawn to scale at left. 



Figure B: Zooecium tipped forward to show lyrtila, cardelles, and oral avicularium. 

 Drawn to scale at left. 



Figure C: Operculum. Same scale as figure D. 



Figure D: Another operculum from the same colony. Drawn to scale below. 



Figure E: Colony, showing ovicelled and nonovicelled zooecia. Drawn to scale at left. 



Figures F-I: Range of secondary orifice variation in the same colony. Oral avicu- 

 larium is present in the first three but does not show because of angle at which viewed. 

 Perhaps the most typical orifice is figure G. All drawn to scale below. 



Figure J: An anomaly, two oral avicularia, was found in two neighboring zoids. Same 

 scale as figure B. 



Figure K: Mandible. Same as figure D. 



Figure L: Mandible and covering o\'er the membranous back area of avicularium. 

 Same scale as figure K. 



Figure M: Young, recently formed zoid with narrower lyrula and no cardelles }'et. 

 Same scale as figure B. 



Note: Figures C, D, K, and L are from Station 226 balsam slide preparations. The rest 

 are from Station 240. Figures A and J are from uncalcined colonies, the remainder are from 

 calcined material. 



