616 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



even on different parts of the same colony, but the position and form of 

 the gonopores (ooeciopores) and their tubes (ooeciostomes) are again 

 fairly constant. With most of the species of this order these reproductive 

 organs are essential for exact determination, and even here a certain 

 amount of caution is necessary. 



The order is ancient, dating back at least to the Ordovician, and the 

 number of fossil species that have been described far outnumbers those 

 that exist today. How many of these, both fossil and recent, may event- 

 ually go into synonymy, no one can even guess, but undoubtedly a very 

 large number of them, described from fragments, young colonies, or 

 vi^ithout ovicells, may eventually be properly placed. 



Glossary 



A few terms which are not included in preceding glossaries, or which 

 have a different use in the Cyclostomata. 



Alveoli. Pores of various sizes distributed between the zoids (see 

 cancelli). 



Autozoid. The functional nutritive individuals of the colony. 



Basis rami. A small wedge-shaped base of a branch, characteristic of 

 the crisias. 



Brood-chamber. A cavity, usually large, surrounding a gonozoid 

 which opens into it (not an expansion of a gonozoid). 



Cancelli. See alveoli. 



Capitulum. An expanded "head" at the tip of an erect branch, usually 

 with an ovicell or brood-chamber. 



Disc. The frontal area of a zoarium in the lichenopores ; in complex 

 colonies there are often numerous discs. 



Fascicle. A series or bundle of connate tubules or peristomes. 



Gonozoid. A reproductive individual, often greatly expanded to har- 

 bor the developing larvae. 



Kenozoid. Various types of greatly modified individuals without poly- 

 pides, which serve other purposes in the colony, e. g., the joints of radicles 

 in the crisias, and the alveoli (cancelli) in the heteropores and lichencn 

 pores. 



Nannozoid. A much reduced individual similar in appearance to an 

 autozoid. 



Ooeciopore. The aperture of an ovicell. 



Ooeciostome. The tube surrounding an ooeciopore, the morphological 

 end of a gonozoid (ovicell). 



