REPORT ON THE POLYZOA. 
87 
Speaking generally, the species of Salicornaria may also be grouped into those in which 
the areolation is fundamentally rhomboidal, and those in which it is strictly hexagonal. 
In both, in certain states, pyriform areas are common, more especially in the younger parts ; 
and the rhomboidal areas very commonly become hexagonal by the truncation of the 
upper and lower angles, whilst in the truly hexagonal forms the upper and lower angles 
of the area are acute, and it is very rare, I think, to meet with the true hexagon in a 
rhomboidal species ; but this occurs sometimes in Salicornaria sinuosa. In connection 
with these two fundamental types of areolation, it would appear that the rhomboidal 
form occurs in those species in wdiich the articulation is by straight tubes, whilst the 
true hexagonal areolation is characteristic of those in which the nodular connection 
exists. 
The known species in which the areolation is fundamentally rhomboidal and the 
articulation tubulate, are : — 
( 1 ) Salicornaria farciminoides, Cuvier. 
(2) Salicornaria sinuosa, Hass well. 
(3) Salicornaria simplex, n. sp. (PL XXXIII. fig. 8). 
? (4) Salicornaria crassa, n. sp. 
? (5) Salicornaria hirsuta, Kirchenpauer. 
Whilst those in which the areolation is originally hexagonal and the articulations 
nodular are : — 
(6) Salicornaria variabilis, n. sp. 
(7) Salicornaria aciculcita, n. sp. 
(8) Salicornaria bicornis, Busk. 
(9) Scdicornaria dubia, n. sp. 
(10) Salicornaria malvinensis, Busk. 
(11) Salicornaria tenuirostris, Busk. 
(12) Salicornaria johnsoni, Busk. 
(13) Salicornaria johnsoni, var. gracilis, Busk. 
? (14) Salicornaria hexagonalis, n. sp. 
y. inarticulatce. — The only cylindrical branching form with which I am acquainted, 
in which the growth of the branches is absolutely continuous and without the least 
indication of segmentation is : — 
(15) Salicornaria magnijica, 
which is further distinguished by the entire absence of avicularia. 
As regards the bathymetrical and geographical distribution of the Challenger 
Salicornariadee, it may be stated that the former extends from 5 to 1950 fathoms ; and as 
