154 PROCEEDINGS OF THE CALIFORNIA 
8. H. trigonarius, Brandt. Mauritius. Java. Sandwich Islands. Feejee 
Islands. 
Unfortunately, our only example of this species is a single denuded test, 
whereas of the foregoing we have three fine specimens; the arrangement of 
the tubercles in the abactinal part of the ambulacral region is, however, suffi- 
cient to establish its specific identity. The spines are usually triangular in 
section. 
ECHINOMETRA. 
9. EF. Van Brunti, A. Ag. Peru. Panama. Gulf of California. 
10. #. lucunter, Blainville. Zanzibar. Red Sea. East Indies. Japan. 
Sandwich and Feejee Islands. 
Of this species we have three specimens, two of them from Japan, pre- 
sented by W. J. Fisher. 
11. £. oblonga, Blainville. Philippines. Seychelle Islands. Sandwich 
Islands. 
STRONGYLOCENTROTUS. 
12. 8S. purpuratus, A. Ag. 
This species is abundant on this Coast between Puget Sound and San 
Francisco, but data are wanting to determine its range north and south of 
those points. It is eaten by the Italians. In color it is dark violet when alive, 
but the dried tests have a greenish tint. 
13. 8S. Franciscanus, A. Ag. 
This species is one of the largest of the Echinide, attaining a diameter of 
six inches across the test. It is found at various points upon the Pacific Coast, 
from Queen Charlotie’s Island to San Diego, and A. Agassiz gives Formosa 
also/as one of its localities. 
14. S. Mewicanus, A. Ag. 
Several specimens from the Gulf of California. The spines in this species 
are nearly as long as the diameter of the test; a peculiarity by which it may 
easily be distinguished from S. purpuratus. 
15. S. Drobachiensis, A. Ag. North European Seas. North Pacific. N. E. 
Coast of North America. 
This species is common to the more northern parts of both continents, and 
is found on both shores of this continent. It is, in fact, one of those animals 
which appear to have been driven in all directions from the pole, by the 
influence of increasing cold. 
Our specimens, which are very fine and perfect, were presented by W. Jones, 
Esq., Surgeon U. 8. N., and were dredged in 45 fathoms, about 6 miles off 
the shore of Marmot Island, Alaska, from a bottom of rock and sand. 
