564 DR. J. E. GRAY ON OCULINARIA. [NoV. 12, 



truncated and only slightly angularly bent in the middle, and the 

 animal has a distinct white streak on each side of its neck, and the 

 shields over the temples are flatter. The ridge of large tubercles on 

 the under outer side of the hind legs are small and more equal ; and 

 the nose is longer, more conical, and produced. The under and 

 outer sides of the hind legs with a series of large broad scales, the 

 last, near the feet, being high and conical. 



DESCEIPTION OF PLATE XLII. 



Fig. 1. Hydraspis gordoni (nat. size), from tlie animal living in the Zoological 

 Society's Gai-dens. 



2. GiJar end of sternum (one-fourtli of nat, size). 



3. Anal end of sternum (one-fourth of nat. size). 



5. Note on Oculinaria, a New Germs of social Ascidia. 

 By Dr. J. E. Gray, P.R.S., V.P.Z.S., &c. 



The British Museum lately received from Dr. Bowerbank some 

 animals in spirits from Fremantle, West Australia. Among others 

 there is a group of Ascidia that is very distinct from any that I 

 have previously seen. It is very like a fragment of an old stem of 

 Oculina virginea. I therefore propose to call it 



Oculinaria australis. B.M. 



The mass is cylindrical, about 8 inches long, and 11 inch in dia- 

 meter in spirits. It is white, with ends rather tapering and rounded. 



Oculinaria australis. 



It entirely consists of a large number of more or less oblong cysts, 

 placed closely side by side on every side of an imaginary central axis. 



