194 Rev. T. Hincks's Contributions towards a 



noticed in S. varians, railii *, occurs in S. obtecta ; but here 

 the normal structure preponderates largely, 



Scrupocellaria cervicornis, Busk. 



Zoarium very slender, transparent, of a delicate pearl- 

 white, branched, the branches very narrow. Zocecia disposed 

 in two lines, alternate, slender, tapering off downwards, sur- 

 face smooth ; aperture oval, with a very slightly thickened rim, 

 occupying less than half the front ; 4 or 5 marginal spines 

 above, of which the lowest on the outer side is branched or 

 antler-like (2 or 3 divisions) ; an operculum covering about 

 two thirds of the area, somewhat enlarged above, narrowing 

 off downwards, and subtruncate below, with a hand-like 

 pattern arranged in a two-lobed figure ; lateral avicularium 

 very minute, at the base (between it and the margin of the 

 cell) a very tall spine, curved slightly inward ; below the 

 area, rising on the inner side of it, a tall columnar process, 

 bearing a much elongated avicularium , the slender subspatu- 

 late mandible sloping abruptly downwards from the summit 

 (to which the base of the beak is attached) , and tending ob- 

 liquely across the lower portion of the cell towards the side of 

 the branch ; sometimes replaced by an avicularium of much 

 smaller size and of the more usual form ; vibracular cell rather 

 slender, erect, not much expanded below, narrowing off 

 towards the blunt upper extremity, groove sloping abruptly 

 downwards from the summit to the base of the cell ; seta very 

 long (nearly three cells' length) and extremely slender ; foramen 

 small. Dorsal surface flattish, smooth, traversed by a very 

 graceful sinuous line, marking the junction of the rows of 

 zooecia. 



Loc. Oft' Cumberland Island {Busk) ; Singapore or Philip- 

 pines (Miss Jelly) . 



In Busk's figure of S. cervicornis the front avicularia are 

 represented as small and of the ordinary character. In the 

 specimen on which the present diagnosis is based they have 

 almost all assumed the very singular form which I have de- 

 scribed above. The columnar support on which the appen- 

 dage is borne is of remarkable height ; and the elongate beak, 

 with its spatulate mandible, drops abruptly from the summit 

 to rest on the surface of the cell below. In the presence of 

 the wonderful array of highly organized appendages on the 

 front of the zoarium, we are not surprised to find the lateral 

 avicularia atrophied and almost extinct. 



* " Report on the Polvzoa of the Queen Charlotte Islands," Annals 

 for December 1882. 



