618 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



2. Zoaria adnate, linear or flabellate, ovicells simple 3 



Zoaria adnate or erect, usually flabellate but sometimes with 



narrow, erect branches; ovicells expanded 4 



3. Tubules not seriated nor fasciculate; ovicells slender-pyri- * 



form or only slightly expanded Oncousoeciidae 



Tubules single or in small erect fascicles ; ovicell short, 



between fascicles Frondtporidae 



4. Zoaria usually adnate and flabellate, but may be erect and 



branched ; tubules not fasciculate ; ovicells expanded laterally, 



ooeciostome terminal or central Diastoportdae 



Zoaria adnate, with few exceptions, the tubules usually fas- 

 ciculate or in series; ovicell usually ramifying among the 

 tubules, sometimes more simple Tubuliporidae 



Family Oncousoeciidae Canu, 1918 



"The axis of the ovicell is parallel to that of the tubes. The ovicell 

 is developed at the same time as the adjacent tubes which are not dis- 

 arranged in their respective positions." (Canu and Bassler, 1920:687). 



The ovicell is a simple inflation of the gonozoid, with a terminal or 

 sub-terminal ooeciostome, and is often as primitive as that in the genus 

 Crisia. The development of the ovicell has some influence on that of 

 the adjoining tubes, separating them to some extent, and, in the linear 

 species, the tubules at the sides of the ovicell may be increased in number. 



Only three genera with recent representatives concern us here, viz.: 



1. Stomatopora. Zoarium uniserial throughout, except around the ovi- 

 cell which has tubes on both sides, no doubt for additional nourish- 

 ment of the developing larvae. 



2. Proboscina. Zoarium uniserial for only a short distance at the proxi- 

 mal end, then becoming biserial or with additional tubes over most 

 of the length of the linear lobes. 



3. Oncousoecia. Zoarium rounded, flabellate or with flabellate lobes; 

 the ovicells either narrow or sometimes slightly lobed. 



It is evident that this separation is largely based on zoarial characters 

 but the groups present rather distinct facies and it is convenient to treat 

 them separately. In Oncousoecia the ovicells are more embedded be- 

 tween the adjacent tubules than in the other genera, where they are 

 usually ventricose. In all cases the ooeciopore is terminal or nearly so. 



