Plate 31 



Smiuinella ruhrilingulala, new species 



Figure A: The peristomial sinus, its two supporting ledges, lyrula, and small triangular 

 ante-lyrula process (support for a probable future avicularium?). Drawn to the 0.1 mm. 

 scale at right. 



Figure B : Tangential view of secondary orifice, peristome, sinus and one of its supporting 

 ledges. Drawn to the 0.1 mm. scale at left. 



Figure C: Inside view of the lyrula, the reddish ante-lyrula triangular process, the two 

 lateral supporting peristomial ledges, and (blacked-in) peristomial sinus. Same scale as 

 figure A. 



Figure D: Three zooecia and ovicell. Drawn to the 0.3 mm. scale at left. 



Figure E: Side view of peristome and sinus. Same scale as figure B. 



Figure F: Another inside view of the lyrula, lateral peristomial ledges, ante-lyrula 

 process, and porous frontal. Same scale as figure B. 



Figure G: Looking into the primary (blacked-in) and secondary orifices. Lyrula in the 

 background. Same scale as figure B. 



Figure H: Ovicell and peristome detail. Drawn to the 0.2 mm. scale at right. 



Figure I: Detail of peristome, possible avicularial chamber.^ (the stippled, axe-shaped 

 central area), and its ante-lyrula tip. The tip is usually a deep rose color, i. e., the most 

 intense color of the zoid is concentrated about this tip, inside the orifice. Peripheral pores 

 are generally somewhat larger than the other frontal pores. Same scale as figure B. 



Figure J: Freehand, reconstructed diagram of primary orifice as seen from the inner i 

 surface. Distal vestibular arch is a larger ellipse than the proximal part housing the lyrula. 

 The two knobs at the corners are not cardelles but the ends of the supporting peristomial 

 sinus ledges. 



Figure K: Freehand diagram of undersurface of a zooecium, showing exact distribution 

 of membranous interzooecial connections. These tubules are wider and less numerous than 

 those of Mucrojiella crozetensis (cf. plate 20, figures D,K). 



Note: The material figured on this plate is from Station 184. 



I 



