241 



or triangular fenestra. Within tlie latter the on'cinm shows an irregular collect- 

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

 feneslrse and in the region hetween them. 



Form of colony, hi the principal hranches we find everywhere a regular 

 alternation of uni- and hi-zoa'cial internodes, and hranches of u|) to <S single 

 zod'cia may spring from Ihc daughler-zoa^cium. 



Of this s[)ecies I have examinetl colonies from l\n[ Weslern, liass' Strait and 

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



Hincksiella n. g. 



The stenuil aica has a nund^er of feneslraj 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 scaj)ular occur, and 

 the.se form together a wing-like llange on either side of the /od'cium. The occlu- 

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



Hincksiella pulchella Maplcslone. 

 Catenicella i)ulchella Mai)leslone, Journal Micr. Soc. Vicloria, Vol. 1, 1880, 



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

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



I'l. I, (ig. 4. 

 (PI. XII, figs. 9n-0c). 

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

 a slightly arched sternal area, which has 6—^7 oval fenestrae 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 zoa'cium is separated from the lateral chambers by very tliick walls 

 (fig. 9 c) and the zoa^cial margins between the fenestrae and the lateral chambers 

 are therefore very dark. 



The lateral chambers form a wing-like flange in (he 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-plales, is everywhere, also on 

 the adzocecial 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 adzoa'cial, infra-scapular chamber of the mother-zoa-cium 



IS wanting. 



16 



