24 
VJNE : CAMBRIDGE GKEENSAND. 
Family MlCROPOEELLID^, Hincks. 
British Marine Polyzoa, Vol. L, p. 204 : Challenger Reports. Polvzoa, Busk, (pars.) 
19. — MiCROPOKELLA Sp. (? ANTIQUATA). PI. II., fig". 11. 
Zoarium. encrusting". ZocEcia, marginate, aperture semi-circular, 
lower lip entire, with a circular umbo (pore ?) below. 
.Locality: Cambridge, Greensand. 
There is in Mr. Jesson's collection a sing-le colony, of only a 
few cells, of a species of Microporella (?) that I cannot identify in 
any published figures known to me. The cells are marginate, 
similar in some respects to Flustramorpha marginata, Busk (Chal- 
lenger Report, pi. XX., fig. 8), but the cell mouth is different, and 
beneath the lower lip is either a small tubercle or a circular pore, 
and as this is only well shown on the surface of one cell no 
comparison can be instituted. The cells are one millemetre in length, 
and the colony is 7 mm. long, and 2 mm. broad. 
Family Selenariid^, Busk, 1853. 
Only two Genera are placed by Busk in this family Cupvlaria 
Lamx., and Lumdites Lamx., and besides giving a very fair 
description of the generic and specific characters of the Crag species, 
a rather full list of aU known species is furnished by the author.* 
The family is represented by only one Genus — Lunulites — in 
the Cambridge Greensand collection, and by only one species of the 
Genus. 
Genus Lunularia, Lamoroux. 
Busk, Monograph of the Challenger Polyzoa (Cheilostomata) 
1884. = Lunulities Lamx. Busk and other authors generally, 
Zocecia disposed in series, radiating from the centre and bifurcating 
as they advance towards the border ; the vibracula lying in 
linear series, alternating with those of the Zocecia. The chitinous 
vibraculum usually bifid, or trifid at the extremity. Busk, Challenger 
Monogr. (op. cit.) p. 208. 
20. — Lunularia cretacea, Defrance. 
= Lunulites cretacea Defrance, D'Orbigny. 
The specimens which I place here are not numerous in the 
* Monograph of the Crag Polyzoa, pp. 78-89. 
