250 I' niri rsity of California Publications in Zoology. [Vol. 6 



95. Tubulipora pulchra MacGillivray. 

 PI. 23, fig. 32, 33, 34, 35. 



Tubulipora pulchra MacGillivray, 1885, vol. XXI, p. 94, pi. 2, fig. 1. 

 Tubulipora fimbria Lamarck, forma pulchra MacG., Waters, 1887, ser. 5, 

 vol. XX, p. 258, pi. VII, figs, 1, 2, 3. 



Zoarium small, delicate, white, in younger stages fan-shaped, 

 in form not unlike other colonies of Tubulipora, usually becoming 

 divided into three or four elongated lobes radiating from a 

 center, each lobe wider at the distal end than where it arises 

 (id. 23, tig. 33); originating in a circular disk (fig. 34, dk.) 

 surrounded by minute quadrangular teeth (t.). Triangular 

 la Hi visible from the upper side of the colony mi many of the 

 lateral zoceeia, and at irregular intervals on the sides of the lobes 

 of the zoarium similar teeth occur (fig. 32, kit. t.) ; numerous 

 large structures of a similar character on the dorsal or under 

 side of the colony (fig. 35 dor. t.) Ocecium (oe.) an inflation 

 of the surface, often lobed. Ooeciostome large, opening beside, 

 often in front of, a zoeecium; tube of ooeciostome (oest. t.) low, 

 widening somewhat upward, compressed. Ouciopore, (oep.) 

 considerably larger than the ooeciostome, compressed, the rim 

 somewhat higher in the middle than at the sides, then sloping 

 downward and outward. 



This species is more delicate, and its zoceeia more slender than 

 those of either of the Tubuliporidae described cm the preceding 

 pages. It is conspicuously white, and its graceful, delicate 

 colonies are easily recognized growiug among the coarse, grey 

 colonies of T. occidentalis on fronds, stems, or holdfasts of kelp. 

 A very striking feature of these colonics are the calcareous 

 projections from the sides of the lateral zoceeia. These may he' 

 readily detected with very slight magnification. They are larger 

 on the oldest zoceeia, and are sometimes much larger relatively 

 than represented in the drawings. On the dorsal side of most 

 of the zoceeia of a colony occur calcareous projections (fig. 35 

 dor. I. ) which resemble feet in having a broad sole by which 

 the colony is fastened to the substratum. These arise as hollow 

 processes in a manner similar to spines, but instead of growing 



