Plate 24 

 Sniittina alticollarita, new species 



Figure A: Primary orifice witli a young lyrula tliat is narrower than the ordinary lyrula, 

 and the usual tall cardelles. Peristome not yet fulh' developed in height. From holotype 

 colony. Drawn to the scale below figure F. 



Figure B: Upper part of a zoid from the same colony; peristome trilobate and elevated;! 

 avicularium in characteristic position in peristomial gap. Same scale as figure C. 



Figure C: A very young, unthickened peristome, pear-shaped secondary orifice, andi 

 peristomial sinus. From holotype. Drawn to the scale immediately below. 



Figure D: Older zoid from the same colony, having wider lyrula, a tall cardelle, and an: 

 oral avicularium. The right third of the peristome is beginning to flare out. Drawn to: 

 the scale below figure F. ; 



Figure E: Flared, elevated, trilobate peristome of paratype. The primary orifice is; 

 not pictured exactly because it was debris-choked. Two faintly defined hemispherical 

 structures (.^), one below the peristomial gap and the other to one side (dotted), occur on a; 

 single paratype zoid but are so vaguely defined that It Is not possible to tell if they are^ 

 avicularla or merely worn, roughened parts of the frontal. In all other respects the paratypei 

 agrees with the holotype. Drawn to the scale below figure F. i 



Figure F: Another zoid from the holotype colony showing a wider peristomial gap thani 

 in figure C. Same scale as figure C. 



