456 TUBULIPORIDJE. 



ENTALOPHORA CLAVATA, Busk. 



Plate LXV. figs. 6-8. 



PUSTULOPORA CLAVATA, Busk, Crag Polyz. 107, pi. xvii. fig. 1 : Peach, Journ. 



Boy. Inst. Cornw. iv. (1871-73). 

 PrsTULOPORA DEKLEXA (part.), Hincks, Dev. Cat., Ann. N. H. ser. 3, ix. 300 



(the specimen from Berry Head). 



Zoarium with a short stem, branched dichotomously, sur- 

 face minutely and thickly punctate, the puncta white, 

 sometimes a cluster of erect shoots rising from the 

 same base ; branches stout, of much the same thickness 

 as the stem, except towards the extremities, where they 

 dilate considerably, and present a clavate figure, fre- 

 quently dividing into a doublet or triplet of branchlets. 

 Zocecia slender, usually projecting slightly below, above 

 with a much larger portion free and flexuous, irregularly 

 disposed; orifice circular and plain. 



Height about | inch. 



THIS form, which has only occurred on our south-western 

 shores and off the coast of Antrim, seems to be identical 

 with Busk's Pustulopora clavata from the Crag. Its 

 most marked characteristics are the decidedly clavate 

 extremities of the branches, and the tendency to form 

 triplets of terminal branchlets. In Torbay specimens the 

 branches are thick, and of pretty uniform size up to the 

 terminal division, from which they expand into very stout 

 and short branchlets, usually three in number. In Mr. 

 Peach's specimen from Cornwall the clavate expansions 

 are not quite so massive, but are still a very conspicuous 

 character. 



The apex of the branchlets is cellular ; and the lumina 

 of the tubes on its surface sometimes number nearly forty. 



In fine specimens as many as four or five erect and 



