30 
CRETACEOUS CILIOPOUA 
but its typical species differ essentially by having a solid lamina passing throngli 
the centre of tlie brandies. On reconsidering this question, I lind that the latter, 
namely, the typical BuUastopora of d’Orbigny, must be again united with 
teripom, because the slightly smaller or greater compression of the branches 
(ivhich arc very broad and cespitosc in typical Mesenieripora) cannot be considered 
as a character of generic i-alue. On the other hand, the species which only differ 
Irorn typical EnlaJophora: with cylindrical branches by having them slightly com- 
pressed, and for Avhich I then believed that the name BkUostojwm might be 
retained, must be referred to Enlalopliora. It might he that the name Bklkts- 
topora is still admissible for some of the species referred by d’Orbigny to it, 
but of which from mere figures it is at present difficult to judge ivhethcr they 
belong to the cheilostomatc or to the cyclostomate dmsion of the Ciliopoda, 
and this question must, therefore, be left to fm-ther research for settlement. 
XV. PEOBOSCIXA, Auclouin, 1820, (p. 29). 
1. PiiOBOsciNA iiADiOLiTOiiUM, cVOrhigiuj, PI. Ill, Eig. 0. 
1851. Prohoscina radiolitorum, d’Orb., Pal. Franc;, terr. cret., v, p. 851, pi. 033, figs. 8-10. 
1854. „ „ „ Eeuss in Deuksoli. Akad., Wien, vol. vii, pt. I, p. 137, pi. xxvii, 
fig. 14, and pi. xxviii, fig. 7. 
Broh. colonia ramis dichotomis seu parthn conjlueutibus, latis, connexis, ad ter- 
mlnationes nominnquam claviformibiis ; cellnlis liibulosis baud distincter separatis, 
Iccmgaiis, oriJivUs modice clevatis, appi'oximatis, in seriebiis obliquis, irausversis, p)lus 
^minusce regnlaribus dlsqyosiiis. 
The characteristic distinction of this species consists in the apertures of the cells 
being arranged in more or less regular transverse series, in each of ivliich they are 
more closely placed to each other, than is the distance between two adjoining cells in 
a longitudinal direction. Sometimes the orilices in one of these cross series become 
almost confluent ; this is, however, only the case ivlien their tuhular termina- 
tions hai’e been broken off. The form of the colony is I'cry A'ariable, sometimes 
single, or dichotome, or several branches become more or less confluent, but 
in all the same arrangement in the cells and the same size of the orifices is to be 
observed. 
Locality. — North of Poodoopolliam, incrustmg shells of Terebmtula sub- 
depressa, StoL, not common. 
Formation. — Arrialoor group. 
E’Orbigny described the species from the Turonien bed of ‘Pons (Charente- 
luferieure),’ from ‘ Angouleme (Charente) and from Sainte-Maure (Indre et Loh-e).’ 
Prof. Ileuss found it in the Gosau-deposits of the Alps and in the Plainer 
limestone of Eohemia. 
( GI ) 
