308 



part. On the other hand, it may quite lack pore-pits, or these may apj)ear to a 

 number ot one or two. Immediately proximal to it is seen the more or less protruding, 

 cylindric-conical ascopore. I have not succeeded in finding an operculum in the 

 dry colony examined, and it niaj' be concluded therefore that the operculum 

 has been membranous. When the basal wall of the colony is ground down, there 

 is seen a wcll-develoj)ed vestibular arch (fig. 5 b, 5 d). The very thick basal wall 

 of the colony, which does not show zo(tcial boundaries, is covered with numerous 

 larger and smaller tubercles and perforated by i)ore-canals, which may have a 

 larger or smaller opening. From the cavity of the zoa'cium they arc separated by 

 multiporous rosette-plates, of which 5 — 8 maj' appear irregularly scattered. Each 

 distal wall is further provided with 3—4 and the distal half of each lateral wall 

 with 2 — 3. The number of pores in each plate lies between 4 and 12. 



The ooecia (figs. 5 b, 5 d), which appear in fairly large nundjer, are easily 

 recognised from the peristomial tubes of the ordinary zocecia by projecting straight 

 outwards (not obliquely ascending) and by being arched, crater-shaped, with as 

 a rule a transversely oval aperture; they are richly provided with pore-pits. It 

 must also be remarked, that the appertaining gonozoa^cia have a very narrow 

 distal wall and often have no avicularia. The ooecium-bcaring zoa-cia ai)pear very 

 distinctly amongst the others on grinding down the basal half of the colony, as 

 it is only possible to see the outer aperture in them from the basal side; this 

 aperture in the ordinary zoa-cia being hidden by the obliquely ascending peris- 

 tome (fig. 5 b). The ocrcia rarely occur singly, but as a rule in shorter or longer 

 transverse rows scattered at greater or lesser distances over the surface of the 

 colony. 



The avicularia, which vary very considerably in size, appear as a rule either 

 singly or doubly on each zoa'cium, in the latter case one on each side. They are 

 situated at a level with the peristomial pore, and the chami)er which is freely 

 projecting at least in the younger zoa-cia has its point directed obliquelj- outwards 

 and upwards. The mandible, which is broadly triangular at the proximal part, 

 runs out in a long, bent point. 



The colony occurs as a free, foliaceous expansion with a single layer of 

 zocecia. 



Port Phillip (Miss Jelly). 



Family Conescharellinidae n. f. 



Sclenariidae Busk p. p. Schizoi)orcllidac Mac Gilliv. p. p. 

 The zocecia, which are provided with a covering membrane and always lack 

 spines, are in contrast to the general rule so placed that the proximal part of 



