334 



fold. In those cases where the ooecial rover consists of several adjoining pieces, 

 it is however only the distal piece which is early laid down as a low ridge, 

 whilst there is yet no trace of the other i)arts which only appear later. Whilst 

 I have not seen simple and conij)ound octcia on the same colony, colonies of the 

 same species from different localities on the other hand present a difference in 

 this regard. Thus, the 0(rciuni is simple in an incrusting colony of H. furaitd 

 from Siam, which agrees in all essentials with a form from Singapore which 

 appears in free, two-layered laminate colonies and in which Ihe ocrcium is com- 

 pound. Whilst the form of E. suhiminersa figured hy Hi neks has a com[)ound 

 ocecium, the ooecium in one of the colonies examined hy me frona Victoria is 

 simple. The same difference is also seen in E. qimdrata, and Mac Gillivray for 

 example figures a Tertiary form of this species with a simple ooecium. 



Emballotheca quadrata Mac Gill. 

 Lepralia quadrata Mac Gill., Mc Coy Prodromus of the Zoology of Victoria, 



Vol. I, Dec. V, pag. 42, PI. 48, fig. 5. 

 Eschara elegans Mac Gill, (non Milne Edwards) Transact, and Proceed R. Soc. 

 of Victoria, Part II, Vol. IX, 1869, p. 138. 

 (PI. XVIII, figs. 13a-13e). 

 The zooecia rectangular, slightly arched, tnberculated and provided with 

 scattered, fairly large pores. The aperture, which is placed immediately proxim- 

 ally to the curved or angularly bent distal margin of the zoa'cium, is rounded 

 quadrangular, somewhat broader than long, and provided with two concave, 

 proximally converging lateral margins, whilst the proximal margin runs out into 

 a broad, but low, rounded or trapeziformly rounded, tooth-like projection. Each 

 lateral margin is provided with a long and strong hinge-tooth, bent proximally 

 and inwards, which seen from the aperture appears as a rule pointed, but which 

 in reality ends in a fan-shaped, dentated, nodulous exjjansion. The operculum, 

 which is but incompletely delimited from the compensation-sac, is surrounded 

 by a more strongly chitinized marginal part, which is continued proximally into 

 a recurved part on each side. Each distal wall is provided with ca. 8 and the 

 distal half of each lateral wall with 3 — 5 uniporous rosette-plates. 



The ooecia, which are provided with a Ihin-walled endooa'cium perforated 

 by pores, are circular in outline, evenly arched and very large, as they spread 

 over a great part of the place occupied by the adjacent 4 — 6 zooecia. The cryp- 

 tocyst layer lying under the ectoofi'cium is, like the rest of the cryptocyst, pro- 

 vided with scattered pores and is thus composed of 4 — 6 sections meeting in 



