666 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



little sub-terminal and consists of a short tube more erect than the 

 lateral peristomes and somewhat larger; the aperture is rounded but 

 modified by irregular folding of the rim. The terminal portion of the 

 ovicell usually extends a short distance beyond the ooeciostome and may 

 be slightly lobate, and in one case it even surrounds the peristome of a 

 neighboring tubule. Borg (1926:383, text figs. 83 and 84) shows the 

 ovicell bifurcating at a branch in F. ramosa, with the ooeciostome 

 terminal on one of the branches, but I have not observed this condition 

 in F. pacifica. 



Fortunately there are several stages in the development of young 

 colonies, two of which show the ancestrula which has not been previously 

 observed in this genus. These are typically tubuliporoid, with the first 

 zoid emerging from the side and the several succeeding generations of 

 zoids encrusting fan-shaped, as in Tubulipora. I would undoubtedly 

 have mistaken them for young stages of that genus if I had not had a 

 continuous succession of stages as well as the adult condition, from the 

 same collection (Station 1193-40), for comparison. The tubules of the 

 first few zoids are at first encrusting, then become semierect with elon- 

 gate peristomes as in Tubulipora. After 3 or 4 generations of zoids, the 

 fascicles begin to make their appearance and the zoarium becomes very 

 irregular. D'Orbigny was not far wrong in his belief that this genus 

 should be "partie de la meme famille que les Tubulipores" (1847:20). 



Type, AHF no. 121. 



Type locality, Hancock Station 1193-40, Santa Cruz Island, southern 

 California, 34°N. Lat., shore collection at low tide, numerous young 

 stages encrusting stems, and fragments of the adult stage. Also a large 

 colony from San Felipe, Mexico, 31°N. Lat., near the head of the Gulf 

 of California, shallow water, presented by Dr. A. E. Noble. 



Family Entalophoridae Reuss, 1869 



Zoarium erect, branched, without joints; zooecial tubes elongate, 

 opening on all sides of the rounded stem and branches ; gonozoids usually 

 situated near the tip of a branch or below a bifurcation, simple and 

 elongate or swollen and perforated by zooecial tubes. The arrangement 

 of the tubules on all sides of the cylindrical stem is the easiest diagnostic 

 character. 



The first stage of development is encrusting and tubuliporoid, and 

 from this small base the erect portion of the zoarium arises. Owing to 

 the mode of development there has been much difference of opinion as 



