Plate 34 



Smittoidea ornatipecioralis hrevior, new subspecies 



Figure A: One of the largest avicularia. Note the broad, short distal area and relatively 

 longer pivotal bar in this subspecies as compared with the avicularia of the preceding, 

 form (cf. pi. 33, E). Drawn to scale at right. 



Figure B: A chitin-reinforced mandible of one of the smaller avicularia. It measures; 

 0.158 mm. X 0.187 mm. More heavily chitinized parts are darkened. Same scale as figure A. 



Figure C: The operculum and its musculature. The more heavily chitinized parts are( 

 darkened. Same scale as figure A. 



Figure D: A zoid beginning to form an ovicell, which is very incomplete as yet. An 

 operculum covers the orifice, its sclerites very evident; lyrula also \'isible. This is one of' 

 the largest avicularia seen in this form. Drawn to the scale at right. 



Figure E: Another zoid, which has both operculum and avicularial mandible in place. 

 Raised plateau on which suboral avicularium is mounted is outlined or punctured by oc- 

 casional small pores, three of which are here pictured (two at right and one below). Opercular i 

 chitinous reinforcements are not as advanced as those of figure C. The broad median r 

 lyrula and one cardelle are visible through the operculum. The mandibular sclerites formi 

 a Y here and are better developed than those of figure B. Same scale as figure A. 



Figure F: The primary orifice, two inwardly directed cardelles, and worn-down lyrula; 

 of an older zoid, seen from the inside. Drawn to the 0.3 mm. scale at right. 



Figure G: Seven zooecia, some of which are beginning to form ovicells. Drawn to the^ 

 scale at lower right. 



Note: Figure F is from a colony from Station 44. Remaining figures are from thai 

 holotype from Station 226. 



