50 NOTES. 



AMBLYPNEUSTES OVUM. 



This is the common Port Jackson species, and one of the most 

 beautiful of all Urchins the colors vary from rich deep orange 

 to olive both of the test and spines ; those from Port Jackson 

 are of a uniform rich orange, the test varies considerably in 

 form, some much higher than wide, others having the axial 

 diameter less than the horizontal, and appear flattened ; the size 

 of the anal system and anal pores varies considerably, as also do 

 the pits at the angles of the plates. I have over a hundred 

 specimens from Port Jackson and Botany, and from several of 

 the sea beaches along the coast, but can only find two distinct 

 species among the whole. The form of the test cannot be taken 

 as a specific difference in this genus. 



AMBLYPNEUSTES GEISEUS. 



This appears to me to be a doubtful species, or perhaps 

 I have not yet met with an authentic specimen ; nevertheless, 

 those which I have determined to be of this species, agree as 

 well as can be expected with PROFESSOR AGASSIZ'S description. 

 Several large specimens, 2'3 x I '75 in., lately received from 

 Tasmania show indications of sculptures like those of A.formossus. 



AMBLYPNEUSTES FOEMOSUS. 



A very beautiful species, easily determined by the elegant 

 sculpture on the coronal plates. The only specimen I have at 

 present was found washed up on " Queen's Beach," in Botany 

 Bay. 



HOLOPNEUSTES POEOSISSIMUS. 



I have seen no authentic record of this species being found 

 on the N. S. Wales Coast, although it is reported from the East 

 and South Coasts of Australia ; but I have recently obtained 

 specimens from Cape Liptrap, spines greenish with the tips 

 purple. Holopneustes purpurescens must be looked upon as a 

 rare species if a good species at all. Three species H. injlcttm, 

 H. porosissimus, and H purpurescens are somewhat doubtfully 

 recognized by AGASSIZ, and without a large series of specimens 

 it is almost impossible to distinguish these varieties ; it is quite 

 likely that they all belong to one species. 



ECHINUS DAENLEYENSIS. 



This species, described by the EEV. J. E. TENISON- WOODS, 

 was first found in tolerable numbers on the shores of Darnley 

 1 sland, and other parts of Torres Straits. It appears to be closely 

 allied to, if not identical, with E. angulosus of A. AGASSIZ. 



