l-'il* TUBULIPORIUjE. 



STOMATOPORA EXPANSA. 



Plate LXII. fig. 1. 



?PROBOSCINA RAUOSA, D'Orbigny ( = !DMONEA CENOMANA, id.), Pal. Franc,-, 

 terr. cr6t. v. 851, pi. dcxxxiii. figs. 1-3. 



Zoarium adherent, sparingly branched dichotomously, 

 walls minutely punctulate and transversely rugose ; 

 branches moderately convex, generally short, narrow at 

 the base, and rapidly widening out towards the extremity, 

 broadly clavate in figure. Zooecia somewhat irregularly 

 distributed, not crowded together, erect, and free for a 

 large portion of their length, increasing in number from 

 one or two at the origin to seven or eight at the top 

 of the branches. Ooecium an irregularly shaped infla- 

 tion of the zoarium on the enlarged portion of the 

 branches. 



I DO not venture to identify S. expansa with D'Orbigny's 

 Proboscina ramosa, though it bears a strong general 

 resemblance to it. The form which Smitt has referred 

 to Wood's Tubulipora palmata agrees with it in the cha- 

 racter of the ramification, but differs from it in having 

 an extended continuous crust, from the edge of which 

 the branches are given off. 



The most striking character of this species is the form 

 of the branches which are short, and terminate above in 

 rather broad clavate expansions. The orifices of the cells 

 are occasionally obscurely rowed ; but generally they are 

 alternate or semialternate ; there is little fixed order in 

 the arrangement. The walls of the zoarium are of a 

 dead white colour, and thickly covered with very minute 

 puncta. 



HABITAT. On dead shells. 



LOCALITY. Isle of Man (T. H.). 



