30 
Mr. A. W. Waters on the 
settenplatte.” This, I have shown, varies in nearly all species 
in such a manner as to be a most useful character, and, as it is 
connected with the mode of growth, may give important classi- 
ficatory indications*. 
It is perhaps necessary to Anglicize the term into “ rosette- 
plate ” on account of forming a plural; but I do not see any 
reason for giving a new name for what has been recognized by 
so many under that appellation, though perhaps some, anxious 
to give their own names, may suggest a fresh one. 
The mode of attachment at the base will, I believe, when 
worked out, also show important variations. Until these points 
are further investigated I hesitate to make a change, lest it 
should be only temporary; but should Dr. Hincks, in his 
forthcoming work, have additional matter to support his 
classification, I shall be prepared to follow him. However, 
for the present, I use the classification which is already in the 
condemned cell, and which, in my opinion, no royal authority 
can long retain. 
The drawings are made with the camera lucida, magnified 
25 times, except in a few cases where it has been advisable to 
give figures magnified 50 times. I much regret not having- 
more skill with the chalk, in order to better illustrate my 
meaning. 
Cheilo'stomata. 
1. Lepralia Cecilii, Aud. (PI. VIII. fig. 6 .) 
Flustrn Cecilii , Aucl., Savigny, Egypte, pi. 8. fig. 3, p. 66. 
Flustra Dtiboisii, Aud., Savigny, Egypte, pi. 8. fig. 4, p. 66. 
Lepralia Cecilii, Aud., Busk, Journ. Micr. Sci. vol. v. pi. xv. figs. 6, 7, 
p. 173. 
Lepralia perugiana, Heller, Bry. Adr. Meeres, p. 102, pi. ii. fig. 10. 
Cells ovate ; surface regularly perforated with small pores, 
except an elongated area below the aperture ; pores arranged 
in irregular linear series round this imperforate area ; mouth 
rounded above, straight below, with a very distinct sinus; 
surface often slightly raised near the sinus. Ovicell smooth, 
elongate, contracted near the aperture. 
Audouin points out that F. Duboisii and Cecilii , Aud., are 
very much alike; and, in the absence of any description, I 
have ventured to unite them and to call the beautiful porcel¬ 
laneous species from the Bay of Naples L. Cecilii. My speci¬ 
mens all show an imperforate area; but this does not seem to 
be the case in others. 
Busk, in his figure of a specimen from Jersey, shows a di- 
* The end wall, which I merely speak of a9 the “ distal wall,’’ shows 
the most variation and is likely to be the most useful in determination. 
