rilBEELLINl. 
281 
UMBRELLINA, von Eeiiss, 1872. 
[Bry. unt. Quad.: Palteontogr. vol. xx. pt. 1, p. 119.] 
Diagnosis. 
Zoarium small ; it consists of a narrow stem ending in a llat- 
topped expansion. Zooecia open only on the upper surface, 
over the whole of which they are irregularly scattered. 
Apertures large. 
Type Species. 
UmlrelUna stehneri, von Eeiiss, 1872. Op. cit. p. 119, pi. xxix. 
fig. 11. Cenomanian: Plauen, Saxony. 
Affinities. 
This genus, of which only one species is known, and which 
is unrepresented in the ^luseum collection, is allied to Chjpeina 
by the general shape of the zoarium and by the absence of 
npertures from the stem ; but the top is not hollow ; the apertures 
nre larger and not confined to the rim. 
Vine’s ^ Umhrellina paucipora is a larval fasciculate Eryozoan. 
HAMMIA, nov. nom. 
Synonyms. 
Stigmatopora, Hamm, 18S1, non Kaup, 1853. 
Ceriopora, pars, Goldfuss, 1827, etc. 
Fastidopora, pars, de Blainville, 1830, etc. 
Entalopliora, pars, d’Orbiguy, 1850, etc. 
Diagnosis. 
Entalophoridte with thick branches composed of numerous 
zooecia. The surface is marked by a spiral ridge, sometimes 
broken into two alternate lateral ridges. A smgie series of 
apeidiu-es occurs on the ridge. 
Apertures crowded, quincuncial ; distributed over the whole 
siudace. 
Type Species. 
Ceriopora ptistulosa, Goldfuss, 1827. Senonian : ^laastricht. 
1 G. E. Vine. Polyz. Lo-^v. Greeusd. : Proc. Yorks. Geol. Soc. vol. xi. 1889, 
p. 270. 
