241 



or triangular fenestra. Within the latter the ocecium shows an irregular collect- 

 ion of very small pores. Numerous spinous processes are found outside the two 

 fenestrse and in the region between them. 



Form of colony. In the principal branches we find everywhere a regular 

 alternation of uni- and bi-zooecial internodes, and branches of up to 8 single 

 zooecia may spring from the daughter-zocecium. 



Of this species I have examined colonies from Port Western, Bass' Strait and 

 from New Zealand (Akaroa). I only found a few ocecia on the latter. 



Hincksiella n. g. 



The sternal area has a number of fenestrse disposed in a curve, but no cryp- 

 tocyst lamina. Hinge-teeth rudimentary or indistinct not projecting in the aper- 

 ture. Of lateral chambers only the supra-scapular and the scapular occur, and 

 these form together a wing-like flange on either side of the zooecium. The occlu- 

 sion takes place in a way similar to that in Scuticella. 



Hincksiella pulchella Maplestone. 

 Catenicella pulchella Maplestone, Journal Micr. Soc. Victoria, Vol. 1, 1880, 



pag. 64, PI. V, fig. 4. 

 — — Busk, Challenger, Zoology, Vol. X, Part I, pag. 13, 



PI. I, fig. 4. 

 (PI. XII, figs. 9 a— 9 c). 



The zooecia oval, with a longitudinally striated basal surface and with 

 a slightly arched sternal area, which has 6 — 7 oval fenestrse on either side. 

 The aperture has a proximal concave margin with a small sinus centrally, the 

 entrance of which is narrowed by two short, somewhat bent, dentiform pro- 

 cesses. The zooecium is separated from the lateral chambers by very thick walls 

 (fig. 9 c) and the zooecial margins between the fenestrse and the lateral chambers 

 are therefore very dark. 



The lateral chambers form a wing-like flange in the entire length of 

 the zooecium. They are wholly calcified and apart from a pore at the end 

 of the triangular, steeply ascending, supra-scapular chamber, they are other- 

 wise without pores. The scapular chamber, which communicates distally with 

 the zooecium through 1 — 2 uniporous rosette-plates, is everywhere, also on 

 the adzooecial side of the daughter-zocecium, developed as an avicularium and 

 provided with a very small, proximally directed mandible. A pedal chamber is 

 not developed and the adzooecial, infra-scapular chamber of the mother-zocecium 

 is wanting. 



