CORALLIFERI. 439 
Lamouroux separates from them 
CrisiA, 
Where the cells, placed in two (usually alternate) ranges, open on 
the same face *. 
ACAMARCHIS fF. 
Where, with the same arrangement we find a vesicle at each open- 
ing f. 
LoRICULA, 
Where each articulation consist of two cells placed back to back, of 
which the opposite orifices are near the top that is widened {. 
EucRATEA, 
Where each articulation has but a single cell with an oblique aper- 
‘ture §. We may approximate to them the 
Exectra, Lamour, 
Where each articulation is composed cf several cells, arranged in a 
ring |. 
We should separate from them 
SaticorniariA, Cuv.§, 
Where the cylindrical joints are hollow internally, with their entire 
surface occupied by cells, arranged in quincunx: they lead to Flus- 
tra, and perhaps to Corallina. In 
Fiustra, Lin. **, 
We find a great number of cells united like honey-combs, sometimes 
covering various bodies, and sometimes forming stems or leaves, of 
which, in certain species, one side only is furnished with cells, and 
in others, both; their substance is more less corneous ff}. 
* Sertularia eburnea, Gm., Ell., Corall., XXI, a, A;—S. scruposa, Id., XX, c, C 
—S. reptans, Ib., b, B, E, F ;—S. fastigiata, Ib., XVIII, a, A. 
+ Sertularia neritina, Gm., Ell., Corrall., XIX, a, A, B, C. 
t Sertularia loricata, Ell., Cor., XX1,b. B. Lamouroux calls them Loricarra, 
but that name has long been devoted to a Fish of the family of the Siluride. 
§ Certularia chelata, Gm., Ell., Corall, XXII, b, B; 8S. cornuta,Id., XXI, c, C. 
Here come the less numerous genera, LArorA, ALEcTO, HippoTHeEA, for which 
see Lamouroux, op. cit. As to his MENIPPEX (Sertularia flabeilum, Gm. Sol. and 
EJL, IV, ¢, c, 1, C, C, 1; and S. erispa, Ib., 1, D, D), I doubt whether they belong 
to this group. 
|| Flustra verticillata, Gm., Sol. and Ell., IV, a, A. 
§| Cellularia salicornia, Ellis, Corall., XXIII ;—Cell. cereoides, Ell. and Sol., V, 
b, B, C, &e. ;—Ceill. cirrata, Sol. and Ell., 1V, d, D ;—Cell. flahellum, Ib. e, C. 
** N.B. According to the observations of Spallanzani, Messrs. Audouin, M. Ed- 
wards, and de Blainville, certain Flustra are inhabited by animals belonging to the 
group of the Ascidiz, but, according to those of MM. Quoy and Gaymard, there are 
some which are very certainly inhabited by true Polypi. It is of consequence to 
know what species belong to the one and to the other. ; 
tt Flustra foliacea, Gm. ; Ell., Corall., XXIX, a, A;—FI. truncata, Id., XXVIII, 
a, A;—Fl. bombicina, Sol. and Ell., iV,b, B;—F. carbasea, Id., 111, 6, 7;—F'. pilosa, 
Ell., Corall., XXXI, a, A, b ;—FK/. tomentosa, Mill, Zool. Dan., III, xcev, 1, 2;— 
Fl. compressa, Moll., Esch., C, 9; Fl. membranacea, Zool. Dan., CXVII, 1, 2;— 
Fl, papiracea, Moll., Esch., 8;—Jl. tubulosa, Bosc, XX VII, IL], xxx, 2 ;—Fl. den- 
. 
? 
