184 Descriptions of New, 



have been previously described. These are Scrupocellaria 

 eervicornis (Busk) and Nellia oculata (Busk), both well- 

 known, though not common, Australian species, occurring 

 also in the Gulf of Florida, and Retepora tuhulata (Busk), 

 dredged by the " Challenger" naturalists off Cape York. 

 Of these new species one, Retepora Worsleyi, is especially 

 interesting, as it consists of narrow, dichotomously-divided 

 branches, without any attempt at the formation of fenestrse. 

 Mr. Hincks' states (British Marine Polyzoa, page 389) that 

 he is acquainted with a non-fenestrate Retepore, probably 

 from the Red Sea; but, so far as I am aware, no description 

 has yet been published. 



Family Cellulariid^. 

 Scrupocellaria annectens, n. sp. Plate II., fig. 1. 



Zoarium erect, branches narrow, dichotomously di Tided, 

 nearly in the same plane. Zooecia elongated, smooth ; 

 aperture elliptical, occupying about three-fourths of the 

 front; margins thickened; an acute spine internally towards 

 the upper extremity, below which is, in the fertile zooecia, 

 a clavate scutum, with a long slender pedicle arching over 

 the aperture; ordinary zooecia destitute of scuta; azooecium 

 in the angle of bifurcation of a branch, with three short, 

 slender spines superiorly. Ooecia broadly galeate, with a 

 smooth rim inferior ly, and superiorly with several marginal 

 or sub-marginal puncta, or foramina. A small, sessile, 

 lateral avicularium, opening directly upwards at each 

 external upper angle; a sessile avicularium, with acute 

 mandible and usually serrated rostrum below the aperture 

 of each zooecium internally and near the mesian line. 

 Posterior surface finely sulcate; a vibraculum at the base 

 of each zooecium, the seta very long, slender, and smooth; 

 frequently a radical fibre or tube from the base of the 

 vibraculum extending laterally to terminate in a similar 

 situation in an opposite branch ; a single vibraculum in the 

 angle of bifurcation of a branch. 



This species approaches the genus Canda in the manner in 

 which the anterior avicularia are arranged, coming very near 

 the mesian line, although not, as in that genus, placed on a 

 special tract. In structure also they much resemble those of 

 Canda arachnoides. The branches also are frequently 

 connected by cross fibres or tubes attached to the bases of 

 the vibracular cells. The scutum seems to be confined to 

 the ovicelligerous zooecia, and is wanting in the others. 



