112 CELLARIID.fi. 



CELLARIA JOHNSONI, Busk. 



Plate XIII. figs. 9-12. 



NELLIA JOHNSONI, flunk. Quart Journ. Micr. So. vi. (1858), 125, pi. xix. fig. 2 



[described from imperfect specimens]. 

 CELLARIA JOHNSONI, Busk, ibid. vii. 65, pi. xxiii. figs. 4, 5 ; pi. xxviii. 



figs. 4, 5 (nat. size and avicularium). 

 SALICORNABIA JOHNSONI, Busk, ibid. viii. (1860), 280. 



Zoarium slender, dichotomously branched, forming small 

 white tufts, about 1 to 1| inch in height. Zooecia 

 elliptical, distant, the space between them traversed by 

 a ridge, which divides above into two lateral branches, 

 passing off one on each side to the top of the adjacent 

 cells ; area smooth, walls very finely crenulated along 

 the edge : orifice placed above the middle of the cell, 

 arched above, lower margin slightly curved inwards. 

 Avicularium situated in the line of the cells, and occu- 

 pying the place of a cell; mandible semicircular, 

 directed upwards. Ovarian opening orbicular. 



HABITAT. Deep water. 



LOCALITY. Shetland, Middle Haaf (A. M. N.). 



GEOGRAPHICAL -DISTRIBUTION. Madeira ; Algiers (J. 

 Y.J.). 



The habit of this species is decidedly slender; but in 

 this respect some varieties of C. fistulosa make a near 

 approach to it. The principal distinctive characters are 

 the elliptical or subelliptical form of the front of the cells, 

 the interspace by which they are separated from one 

 another, with its central bifurcating ridge, and the avicu- 

 larium, which replaces an ordinary zooecium. The 

 mandible occupies the position of the oral valve, on an 

 area resembling that of the cell, but smaller in size. 

 It is large, semicircular, and of a dark horn-colour. 



