158 PROCEEDINGS OF THE CALIFORNIA 
ECHINONEUS. ) 
34. EH. cyclostomus, Seska. Australia. Kingsmills. arian 
35. EH. semilunaris, Gini, Florida. East India Islands. 
RHYNCHOPYGUS. 
36. R. Pacificus, A. Ag. Gallipagos. Panama. Gulf of California. 
Family SPATANGIDA. 
The actinal part of the test occupied by a plastron, with bare ambulacral 
avenues defining its sides. Other plastrons formed by fascioles or bands of 
crowded miliary spines. The combinations of the plastrons and fascioles, 
with the shape of the test and petals, are the principal characters used in 
distinguishing the subfamilies and genera. 
MARETIA. 
37. MM. planulata, Gray. Kingsmills. China. East Indies. Mauritius. 
LONENIA. 
Bey tb elongata, Gray. Red Sea. Australia. Philippines. 
BREYNIA. 
39. B. Australasie. China. Australia. Japan. 
A very fine specimen, 3% inches long by 31% inches broad, probably pre- 
sented by W. Garrett, from the Sandwich or Society or Kingsmill Islands, as 
I found it in company with the crustacea collected by him in those localities. 
ECHINOCARDIUM. 
40. E.cordatum, Gray. Norway. Mediterranean. Britain. Brazil. Florida, 
AGASSIZIA. 
41. A. scrobiculata, Val. Panama. Gulf of California. 
BRISSUS. 
42, B. carinatus, Gray. Society, Sandwich, and Philippine Islands. East 
India. Mauritius. 
ADDITIONAL SPECIES. 
[Acquired since date of List.] 
ARBACIADA. 
Arbacia Dufresnii, Agassiz. Patagonia. Chili. Navigator Islands, 
Locality of specimens in museum not known, 
