8 
Transactions of the Society . 
which the operculum is much contracted at the side, as for instance, 
L. cleidostoma Smitt (figs. 1G, 17), L. rectilineata H., L. Poissonii 
Aud., and to these must be added L. ( Schizoporella ) cryptostoma 
MacG., L. ( Schizoporella ) Woosteri MacGr. Then there are others in 
which the sides are nearly straight, as L. Pallasiana Moll, L. Pal- 
lasiana var. strumata Waters (fig. 33), L. mucronelliformis Waters 
(fig. 15), L. peristomata Waters (fig. 20), L. striatula H., L. elimi- 
nata Waters, L. castanea B. 
In Cellepora, MacGillivray has separated the schizostomous 
forms from the holostomous, the latter being represented by C. albi- 
rostris Smitt, C. pertusa Smitt, &c., &c., most of which have a widely 
open ovicell ; and he has placed all the forms in which the lower edge 
of the aperture is not approximately straight under Schismopora, b it 
certainly Schismopora contains many divergent forms. 
There is a Lagenipora group in which the ovicell has a flattened 
part, or area, which is usually perforated. There is, as a rule, a 
tubular projection, and the ovicell is above the operculum (fig. 25). 
The opercula have the muscular dots (fig. 26) some distance from the 
border, and usually about equidistant from the proximal and distal 
edges, though sometimes much nearer to the distal edge. This is 
represented by L. Costazii Aud., L. lucida Hincks, &c. (see p. 13). 
Cellepora avicularis H., C. coronopus S. Wood, C. dichotoma H., 
have perforated ovicells, and perhaps they should form another group. 
As I have mentioned, it is unfortunate that MacGillivray, in 
sepaxating a small section of the Celleporidae, should have retained for 
that the name Cellepora, giving the name Schismopora to the large 
and somewhat heterogeneous group which will have to be broken up. 
This necessity to divide up Cellepora has long been recognised, and if 
a new name had been given to the holostomatous group, then Cellepora 
could have been provisionally retained for the others. I hope shortly 
to attack the Celleporidae. 
Cellepora ampullacea B., C . ramulosa L., C. dichotoma IT, 
C. janthina Smitt, are put provisionally under Cellepora of the older 
authors, while Cellepora sardonica W. is the Cellepora of Mac- 
Gillivray. 
Crihrilina setosa sp. nov. 
Cribrilina radiata Moll var. a Hincks, Brit. Mar. Polyz., p. 18G. 
From an examination of specimens from Madeira and Naples, I 
cannot agree in calling this form with vibraculae a variety of radiata. 
In C. radiata there are a number of avicularia scattered among the 
zooecia ; these are elongate, and no avicularian bar is developed ; 
whereas in C. setosa, none of these elongate avicularia occur, but on 
each side, proximally to the oral aperture, there is a seta which is no 
doubt vibraculoid, but I have not yet had the opportunity of examin- 
ing the muscular attachment. These setae are very delicate, and are 
easily overlooked. Below the aperture, instead of the median pore 
