Plate 21 

 Parasmitiina hymanae, new species 



Figure A: Primary and secondary orifices showing cardelles, mucro, and l\-ruia. Dra\ 

 to the 0.1 mm. scale at right. 



Figures B and C: Two frontal avicularia showing variations in shape and proportioi 

 Same scale as figure G. 



Figure D: Ovicelled and nonovicelled zooecia. Zooecium at left shows the flat uprig 

 mucro bordered by a peristomial sinus on each side. Avicularium at left belongs tc 

 neighboring zooecium. Ovicelled zooecium has an avicularium in typical position coveri^ 

 an areolar pore. Ovicell bordered by areolar pores which do not pierce its inner wjj 

 Cardelles do not show. Peristome complete distally in nonovicelled zooecia but incompli! 

 in ovicelled ones. Drawn to the 0.2 mm. scale below. 



Figure E: Ten nonovicelled zooecia, some with a\-icularia, some without. The two re 

 of areolar pores on the zoid at lower right show regeneration or a second growth after son 

 thing had interrupted the initial effort. The avicularia always occupy a lateral, periphei 

 and corner position over an areolar pore. Drawn to the 0.5 mm. scale at right. 



Figure F: Secondary orifice and surrounding beaded surface. Same scale as figure A 



Figure G: Mandible. The two darkest patches are sites for muscle attachment, 

 stippled pointed projection between them is missing in younger mandibles and is mereb 

 case of advanced chitinization. Drawn to the 0.1 mm. scale at right. 



Figures H and I: Two opercula of slightl)" differing shape. Same scale as figure A. 



Note: Figures A-F are from a calcined specimen (slide) of Station 184 material. Figq 

 G, H are from "Rock 19" and figure I from "Rock 8", stations unknown. 



