CHILOSTOMATA. 
Moll. 109 
Micro porid;b. 
Steganoporella smithi (Hincks) assuming the habit of a Vincularia on 
the North coast of Australia, and encrusting shells of Tridacna in West 
Australia ; Goldstein, Tr. R. Soc. Viet, xviii. p. 45, footnote. 
Vincularia steganoporoides , sp. n., id. 1. c. p. 44, pi. ii. fig. 5, Marion 
Islands. 
Onychocellioe. 
New family. Ectocyst membranaceous, cryptocyst (soe supra), cal- 
careous ; no marginal spines ; ovicells little apparent, formed by the hol- 
lowed anterior margin of the opesia (see supra) ; “ onychocells ” (verti- 
cally flattened avicularies) rather constant between the zocecia, never on 
them. 
Onychocclla , g. n. Zooecia hexagonal ; opesia semi-elliptical or clover- 
shaped ; onychocells large, membranaceous on one side. 0. mari- 
oni , sp. n., South coast of France and Cape de Yerde Islands, 
0. antiqua (Busk, as Membranipora ), Madeira, on shells, and 
0. lucicc , sp. n., Isle of France, and several cretacean species. 
Ogiva , g. n. Only cretacean or tertiary species. 
Ogivalia , g. n. Zocecia subhexagonal, the upper half forming a 
regular parabolic curve ; opesia semi-elliptical, more or less 
elongated. To this genus, belong the recent Vincularia elegans 
(Orb.) and many cretacean species. 
Floridina , g. n. Zooecia strictly hexagonal, cryptocyst limited exter- 
nally by an oval curve ; opesia trifoliate ; onychocells limited 
by four straight lines. Type, F. antiqua (Smith, as Mollia ), 
recent at Florida, 52-80 metres. 
Smittipora, g. n. Zooecia subhexagonal, ectocyst with a semi-elliptic 
operculum ; cryptocyst presenting three facets, one median, 
flat, behind the opesia, two lateral, oblique, uniting before the 
opesia. S. abyssicola (Smitt, as Vincularia ), Cuba, 819 metres, 
on Retepora. 
Jullien, Bull. Soc. Zool. vi. [1881], 15 pp., woodcuts. 
Cribrilinid.®. 
Cribrilina radiata (Moll.). On its varieties ; Hincks, Ann. N. H. (5) 
xi. p. 412. 
Cribrilina alcicornis , sp. n., Jullien, Bull. Soc. Zool. vii. [1882] p. 508, 
pi. xiv. figs. 23-25, Atlantic, N.W. of Spain, 1068 & 2018 metres. 
Cribrilina setirostris , sp. n., MacGillivray, Tr. R. Soc. Yict. xix. p. 191, 
pi. (ii.) fig. 3, Port Phillip Heads. 
Membraniporella distans , sp. n., id. 1. c. p. 130, pi. (i.) fig. 5, Port Phillip 
Heads. 
MlCROPORELLIDjE. 
Microporella insperata , sp. n., Jullien, l. c. p. 505, pi. xiii. fig. 12, N.W. 
of Spain, 2018 metres. 
