250 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Breynia. 



Agassiz and Desor, 1847. Ann. Sci. Nat. Zool., (3), 8, p. 12. 

 Type, Spatangus crux-andreae Lamarck, 1816 = Spatangus australasiae Leach, 1815. Zool. Misc., 2, p. 68. 



This highly specialized genus was long monotypic and supposed to be 

 characteristic of Australia, so that Anderson's rather recent discovery of a 

 second species at the Andaman Islands is a matter of great interest. The 

 presence of a peripetalous, as well as an internal fasciole, makes the genus easy 

 to recognize. 



Key to the Species of Breynia. 



Apical system about .45 test-length from anterior end; area within peripetalous 

 fasciole about .80 test-length; numerous large primary tubercles within peripeta- 

 lous fasciole, except in interambulacrum 5 australasiae. 



Apical system only about .33 test-length from anterior end; area within peripetalous 

 fasciole about .65 test-length; large primary tubercles less numerous vredenburgi. 



Breynia australasiae. 



Spatangus australasiae Leach, 1815. Zool. Misc., 2, p. 68. 

 Breynia australasiae Gray, 1855. Cat. Rec. Ech. Brit. Mus., p. 46. 



Plate 146, fig. SI. 



This fine spatangoid is common in Torres Strait and extends southward 

 on the western coast of Australia at least as far as Fremantie and on the eastern 

 coast to Lord Howe Island and Port Jackson. The records from the Red Sea 

 and Hawaiian Islands are incredible and those from Hong Kong and Japan 

 probably rest on misplaced labels; mistaken identifications are unlikely in this 

 case. 



The pedicellariae are abundant and varied; though characteristic they are 

 in no way remarkable. No globiferous pedicellariae were found. The ophi- 

 cephalous are very common and are quite distinctive; the valves (PI. 140, fig. 31) 

 are shorter and wider than in most spatangoids: they measure about .22 mm. 

 long with the loops .06-09 mm. more. The rostrate are also quite common 

 and reach a very large size; the valves range from .38 to 1.55 mm. in length; 

 in the largest the base is nearly .70 mm. high and about .65 mm. wide, while 

 the blade is ,85 mm. long, and about .15 mm. wide at both base and tip. Tri- 

 dentate pedicellariae are rare but there are two kinds; stout ones with the 



