Plate 14 

 Cellarinella nutti, new species 



(For explanation of abbreviations see key for plate 12) 



Figure A: The broadest, most perfect colony fragment, 20 mm. long. Its orifices am 

 represented by dots. 



Figure B: Enlargement of node and surrounding internode areas of colony in figure h 

 showing 12 orifices, 5 above node area and 7 below. Scale a. 



Figure C: More detailed view of three zooecial orifices. The large external aviculariuni 

 is cradled between two mucros. Within the orifice is visible the partial partition coniposect 

 of side wall of internal avicularium and inner frontal oral ledge. Scale c. 



Figure D: Three old heavily calcified zoids near base of colony shown in figure A. 

 External a\'iculariuni is deeply sunken in this part of colony. Scale a. 



Figure E: Another orifice from the colony in figure A, tipped forward about 45° so iti 

 internal avicularium can be seen. An external avicularium is lacking in this zoid. Scale d.i 



Figure F: Another zoid from colony of figure A: tipped to show external and internal 

 avicularia. Latter is propped against inner oral ledge. Scale d. 



Figure G: End view of colony fragment cut through at an internode, showing zooeciai 

 cavities of 21 or 22 zoids and end walls of two more. Back and side walls are thin, frontal' 

 walls thick. Triangular beaks of three external avicularia jut out from frontal wall. Be5 

 tween the two transversely placed internal a\'icularia are end walls and sieve plates of tW'V, 

 more zooecia. Corrugations of frontal wall are channels leading to some of external ann 

 internal pores. This figure shows the bilaminate arrangement of the zooecia with mos3 

 zooecia opening out on the two faces and relatively few on the edge. This is characteristic 

 of the broad blade, slablike species of this genus. Scale a. 



Figure H: Looking head-on at an orifice (not tilted). Within orifice is proximal partitioic 

 formed by side walls of internal avicularium and frontal oral ledge. From this view th:! 

 external avicularium Is considerably foreshortened. It is also on an umbo which was difficulu 

 to show because of the angle. Scale b. 



F^igures L J: Mandibles of two external avicularia. Details of chltin-reinforcemenli 

 lucida, and curvature not shown as specimens were not dissected out. Scale d. 



Figure K: Transverse section through two zooecia. Lower one is cut at level of it 

 external and internal avicularia, zooecial cavity, front oral and back ledges. L-pper one i 

 cut at level of end or proximal wall with its two calcareous processes and the sieve platt 

 Scale b. 



