HYDROCORALS OF THE Iv^ORTH PACIFIC — FISHER 529 



number. In a colony from Carmel Bay the number runs higher, 

 ranging from 5 to 12 (pL 60). In the type colony cups with single 

 gastrostyles are rather exceptional, but in another colony cups with 

 one are slightly in the majority. The styles differ greatly in size, 

 vary in form from subglobose to elongate acorn shape, and are beset 

 with delicate, often pronged spicules. The interior of the cup is of 

 a minutely fenestrated, spongy structure, which closely encircles the 

 style, forming a style chamber almost filled by the style (pi. 59, fig. 

 la). In some cases the entire breadth of style can not be seen from 

 above on account of the encroachment of the roof of style chamber 

 (or bottom of gastropore proper). 



In aquaria the zooids expand rather readily. Their form and 

 posture in the cyclosystem are best indicated by the figures (pi. 70, 

 figs. 2, 2a). The gastrozooid has an elongate-ovoid form, the hypo- 

 stome representing the broader end. The tentacles are small, blunt, 

 5 to 8, commonly 6, in number, and are inserted at about midheight. 

 I have one small fragment with expanded gastrozooids on which I can 

 find no definite tentacles. In many other fragments examined the . 

 zooids all have tentacles characteristically short with rounded tips. 

 At the bottom of the gastrozooids the style is plainly visible whenever 

 the mouth is widely expanded. When the gastrozooid retracts, it 

 retires below the bottom of the cup to the slight space immediately 

 surrounding the style — that is, into the style chamber. 



The surface of the coenosteum is firm, sugary in texture under 

 high magnification, and unevenly beset with small papillae some- 

 what less in diameter than a dactylopore. These papillae vary in 

 spacing, and areas exist entirely free from them. They are sometimes 

 merged into low ridges. In the Carmel Bay example these often 

 form costae on the sides of certain cyclosystems rendered more 

 prominent by the inequalities of the granite on which the colony 

 grows (pi. 60). 



The ampullae do not form rounded or blisterhke prominences, 

 yet they may be closely packed between the cyclosystems, each cell 

 about one-third to one-half the width of a cyclosystem. The male 

 ampullae are subspherical, about 0.3 mm in diameter. The female 

 ampullae are probably normally higher than broad (0.4 mm by 0.6- 

 0.8 mm) and are sometimes so crowded that a sectional view reminds 

 one of a miniature purple honeycomb. 



T^2>«.— U.S.N.M. no. 43018. 



Type locality.— VescadeTo Point, Carmel Bay, Calif, (lat. 36°33'30" 

 N.); on granite rock, in grotto exposed at lowest tides. 



Remarks. — This species stands apart from all Alloporas and Stylas- 

 ters by reason of the peculiar organization of the cyclosystem, which 

 typically houses a small aggregation of gastrozooids, although exeep- 



