144 



INVERTEBRATA. 



but that is a true Ceriopora (see Goldfuss, Pet. JDeutsch, pi. x. f. 7 d] 

 Moreover ours is a much more branching structure, rarely shewinj 

 any tendency to fuse into a layer. From Heteropora raniosa it il 

 distinguished by its much more branched and bushy colony and bj 

 its smaller cell openings. 



Its habit of growth distinguishes it readily from Heteropori 

 coalescens, Reuss, whose branches fusfe together into an anastc 

 mosing mass of stems. Sparsicavea irregularis, D'Orbigny, bears 

 close resemblance to our species, but this also forms frequent anas-j 

 tomoses, and its intermediate pores are fewer and less conspicuous 

 In S. dichotoma, Hag., the colony is less branching and the cells ar( 

 much smaller. 



Localities. Upware, Brickhill. 



Heteropora major, n. sp. 

 (Plate VII. fig. 18, a. h.) 



Description. Polyzoarium dendroid; the branches irregulai 

 tapering, in section circular or oval. Contiguous branches oftei 

 fuse and anastomose so as to form wall-like expansions. Cell 

 apertures numerous, simple, and small ; the peristome is plane witl 

 the general surface. Intermediate pores few and small, irregularis 

 scattered. 



Affinities and differences. Distinguished from H. {Zonopora] 

 ramosa (Romer), and H. Icevigata, d'Orb., by the small size of itj 

 cell openings, their wide separation, and the small, scattered inter- 

 mediate pores. The colony is larger than commonly occurs in II.\ 

 ramosa (about twice as big), and I have not detected the zonai 

 arrangement of the cells such as occurs in the two above-namec 

 species. It is nearer to H. Buskana (de Loriol, Foss. Mont Saleve;^ 

 pi. XVIII. f. 6), but its stouter growth and the smaller size of i1 

 cells serve to distinguish it also from this species. 



Locality. Upware. 



PORIFERA. 



Sponges. 



For a general account of the Sponges see ante, pp. 28, 29 {Indi'\ 

 genous fauna). 



