400 ~. POLYPI. 
LorIcwuLa, 
Where each articulation consists of two cells placed back to back, 
of which the opposite orifices are near the top that is widened(1). 
EvucrATEA, 
Where each articulation has but a single cell with an oblique 
aperture(2). We may approximate to them the 
Ex.ectrra, Lamour, 
Where each articulation is composed of several cells, arranged in 
a ring(3). 
We should separate from them 
SaticorniARiA, Cuy.,(4) 
Where the cylindrical joints are hollow internally, with their en- 
tire surface occupied by cells, arranged in quincunx: they lead to 
Flustra, and perhaps to Corallina. In 
Fiustra, Lin.(5) 
We find a great number of cells united like honey-combs, sometimes 
(1) Sertularia loricata, Ell., Cor., XX1I,b,B. Lamouroux calls them Loricanrm, 
but that name has long been devoted to a Fish of the family of the Siluridz. 
(2) Certularia chelata, Gm., Ell., Corall., XXII, b, B; S. cornuta, Id., XXI, c, C. 
Here come the less numerous genera, Larozs, Arecto, Hiproruxa, for which 
see Lamouroux, op. cit. As to his Menterem (Sertularia flabellum, Gm., Sol. and 
‘EIL, IV, c, c, 1, C, C, 1; and S. crispa, Ib., 1, D, D), I doubt whether they belong 
to this group. 
(3) Flustra verticillata, Gm., Sol. and Ell., 1V, a, A. 
(4) Cellularia salicornia, Ellis, Corall., XX1U1;—Cell. cereoides, Ell. and Sol., V, 
b, B, C, &c.;—Cell. cirrata, Sol. and Ell., 1V, d, D;--Cell. flabellum, Ib.c,C. 
(5) 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. 
