Jrom the Gulf of California. 99 
ginata,—a distinction which Mr. A. Agassiz admits as valid in 
that case, where there is, however, much less difference in the 
form of the rosette and other characters. 
The only figure in the monograph by Prof. Agassiz, which 
approaches this species, is that of H. emarginata (Tab. 10), which 
as, to some extent, the same posterior elevation. The ei 
cimen figured was from an unknown locality, and may possibly 
represent a variety of this species rather than of the #. emargi- 
nata of Lutken, A. Agassiz, etc., which is common on the 
Atlantic side of tropical America. 
Astropyga venusta Verrill, op. cit., p. 296. 
Two fine large specimens of this rare species are in the col- 
lection. 
The largest is 5-80 inches broad and 2-10 high. It was 
Sida known to me only from Panama Bay and San 
vador. 
Tripneustes depressus A. Ag.; Verrill, op. cit., p. 875. 
Of this large species there were 19 specimens, with their 
Spines partially preserved. They are quite variable in form, but 
mostly even more elevated than ordinary specimens of 7! ventri- 
- Some are conical, others broadly rounded above. The 
hame, therefore, is a decided misnomer. The largest spines on 
the upper surface of the largest_ specimen are -45 of an inch 
8 in di pidly tape ’ 
those of the lower surface are often ‘60 of an inch long, ‘04 in 
lameter, tapering but little, the end blunt. 
veral specimens give the following proportions : 
Diameter, (inches) 5:80 5°40 535 525 510 490 475 
Height, 300 340 2:90 325 285 265 285 280 
ASTROIDEA. 
Pentaceros occidentalis Verrill. 
Oreaster occidentalis Verrill, op. cit., p. 278, 1866. 
© interra: 
and disk angular. In some most of the upper and part of the 
lower marginal plates bear small obtuse spmes or tubercles; in 
others there are few or none of these; the two smallest speci- 
mens have none, though others scarcely larger, have quite 
number. The smallest specimen has the longer radius 1 inch; 
the shorter ‘50. This, however, has nearly the form and all the 
