AMPHIROA. 63 



Genus CUBOIDES {Quoij and Gaimard). 



Dipliyozooids derived from Abyla (?) 



Hydrophyllium with six flattened and four-sided faces. The chamber for the polypite is 

 deep and conical, and its inferior aperture occupies one face of the cube. Tlie phyllocyst 

 is pyriform or narrow above, and very broad and shghtly bilobed below. 



CuBOiDES viTREUS, Quoij and Gaimard. PI. IV, fig. 5. 



Hydrophyllium with six equal, slightly concave faces, and prominent angles. The 

 inferior face is occupied by a wide infundibuliform cavity, whose apex reaches to the centre 

 of the cube. The phyllocyst is pyriform, with a broad base, which is much dilated and 

 bilobed anteriorly, while above it narrows into a short csecum which approaches the upper 

 face of the organ within about a fifth of the whole diameter. 



Gonocalyx a quadrilateral prism with its edges produced into four strong, serrated 

 crests, ending below in sharp points. The upper portion of the organ is prolonged into 

 a large pyramidal .process, which is traversed by the calycine duct, and forms a strong, 

 longitudinal crest posteriorly. 



Length of the hydrophyllium, one fourth of an inch. Length of the gonocalyx, one 

 eighth of an inch. 



This species was taken twice, once on the east coast of Australia, and once on the south 

 coast of New Guinea. 



The genus Cuholdes was established by Quoy and Gaimard ('Annales des Sc. Nat.,' 

 X, 1827, p. 19), on apparently the very same species as that which I have described and 

 figured. Leuckart (Z. N. K., p. 20) imagines that Cuboides vitrens may be the Diphyozooid 

 of Abyla penfayona, but this idea seems to me to be negatived by the form of the 

 hydrophyllium— more especially of its phyllocyst. On the other hand it might very well be 

 derived from the species which I have named A. Vogtii, as a comparison of PI. II, fig. 3 b, 

 with Cuboides will readily show. 



Genus AMPHIROA {Lesueur). 



Dipliyozooids derived from Abyla (r). 



Hydrophyllium with a trapezoidal section, the longer side being convex ; inferior face 

 obliquely truncated in front (where the wide and deep chamber for the polypite opens); 

 four-sided behind. The phyllocyst is large and oval, with two slender, curved, lateral and 

 superior caeca. 



