CHILOSTOMATA, CYCLOSTOMATA. 
Moll 107 
SELENARIIDiK. 
Lunulites incisa, sp. n., Hiucks, Aun. N. H. (5) viii. p: 127, pi. iv. 
figs. 1-3, Bass’s Straits. 
CYCLOSTOMATA. 
H. Hamm (supra, p. 94) proposes to arrange the inarticulate Cyclosto- 
mata as follows: — 
1. Tuhuliporina. All cells (zooecia) originate from the median longi- 
tudinal axis of the colony (polyzoarium) ; 5 families : Diasto- 
poridea and Tuhuliporidea as understood by Reuss and Smith. 
Spiroclausidea (n.), Idmoneidea as understood by Reuss, 
OscuUporidea (n.). 
2. Cerioporina. The cells originate one from the other irregularly, 
presenting the aspect of a sheaf ; 2 families : Cerioporidea, 
including also Fdsciculipora, and Radioporidea (n.). 
3. Stigmatoporina. A central vertical bundle of long tubular cells 
(zooocia), fi’om which the other cells originate. This division 
comprises the fossil genera Cyrtopora (Hagen), Stigrnatopora 
(n.) = Pustulipora, (Hagen, pt.), and Meliceritites (A. Romer). 
The Spiroclausidea are distinguished by a spirally twisted polyzoarium, 
with quincuncial position and narrowed apertures of the cells ; they 
contain the genera Spiroclausa (Orb.) = Terebellaria (Hagen, nec 
Lamx.), and Spirofascigera (n.), both only fossil. — The OscuUporidea 
are distinguished from the Idmonidea by the plurality of rows of zooecia, 
they correspond to a part of Reuss’s Frondiporidce, and contain the genera 
Seriefascigera (n.) Lopholepis (Hagen), Osculipora (Orb.), Patenaria (n.), 
and Stephanodesma (n.), all fossil. — The Radioporidea are distinguished 
from the Cerioporidea by radial arrangement of the zooecia ; they contain 
the known genera Multicavea (Orb.), Semimulticavea (Orb.), Domopora 
(Orb.), Radiocavea (Orb.), Stellocavea (Orb.), Polytaxia (n.), Radiocavaria 
(n.), Actinotaxia (n.), all fossil except Domopora. 
TuBULlPORIDiE. 
Tuhulipora capitata, sp. n., Hincks, Ann. H. H. (5) viii. p. 128, pi. 4, 
fig. 9, Bass’s Straits. 
Tuhulipora serpens (L.), organizans (Orb.) and dichotoma (Orb.) var. n. 
serialis, all Straits of Magellan, 6 fath., on Fucus ; Ridley, P. Z. S. 1881, 
pp. 58 & 59, the last pi. vi. fig. 10. 
Idmonea milneana (Orb.), S. Chili, the ‘ dots ' raised, but perforated in 
the centre ; id. 1. c. p. 56. 
Densipora, g. n. Polyzoary forming an encrusting mass, discoid when 
young, composed of numerous long closely-packed tubular cells, con- 
tinuous throughout the whole thickness and with the orifices not project- 
ing. D. corrugata, sp. n., Australia, young specimens show Diastoporidau 
characters. MacGillivray, Tr. R. Soc. Viet. xvii. pp. 16 & 17, pi., figs. 
