AGLAISMOIDES. 61 



Aglaismoides elongata. pi. IV, fig. 3. 



The hydroph3'lliura is a vertically elongated prism ; its superior face is square and flat, 

 and a little narrower than the inferior; the lateral and anterior faces are more or less convex, 

 and cut off square below ; the posterior face is pentagonal, being prolonged inferiorly into a 

 short, triangular process, which bends a little forwards. 



The inferior face is excavated by a large conical cavity whose apex reaches the centre of 

 the organ in a vertical direction. In width the cavity occupies about the posterior half of the 

 hydrophyllium. The posterior wall of this cavity is prolonged by the triangular process 

 above mentioned, and on the face of this are seen two short longitudinal crests, which run 

 down from the side walls of the cavity and terminate abruptly below. These inferior angles 

 are pointed and curved. The phyllocyst gives off, or rather is divided into, four processes : 

 Two of these, wide, lateral, pass at first horizontally outwards, and then are deflected at right 

 angles forwards to terminate in caeca which are bent downwards. Another process is very 

 slender, and passes vertically upwards, nearly reaching the superior face of the hydrophyllium. 

 The last, equally slender, runs downwards and backwards parallel with and close to, the 

 posterior wall of the chamber, and ends nearly opposite the commencement of the triangular 

 process. 



The gonocalyces are four-sided prisms tapering to a conical end above, and having their 

 edges produced into crests which end below in four inflected points. 



Length of the hydrophyllium, one tenth of an inch. 



Aglaismoides elongata occurred on the east coast of Australia, in Torres Straits, and about 

 the Louisiade Archipelago. 



It is impossible to compare these species of Aglaismoides with the figures and descriptions 

 which Leuckart and Gegenbaur give of the detached zooids of Ahjla pentagona, without 

 being struck by the many points of resemblance which they offer. 



Indeed, if I had only Leuckart's figures before me, I should be inclined to identify my 

 A. EschcJiolzii with those zooids, but I cannot reconcile Gegenbaur's account of the same 

 objects with my own figures and notes. I prefer therefore to leave the question open. 



In the first specimens which I obtained the gonocalyx was very small, not extending 

 beyond the cavity of the hydrophyllium. Subsequently, I found not only large single 

 gynophores, but on one occasion two large androphores and a small gynophore attached 

 to one polypozooid (PI. IV, fig. 3 h). 



Genus SPHENOIDES (nov. gen.) 

 Biphyozooids derived from Abyla (?). 



The hydrophyllium is wedge-shaped below, but is bevelled into four quadrate faces on 

 its upper surface. The cavity for the polypite is open in front. The phyllocyst is like that of 

 Eudoxia, but has a long, slender, caecal diverticulum from its posterior and inferior part. 



