AGASSIZ: PRELIMINARY REPORT ON THE ECHINI. 81 
Homolampas hastata A. Aa. 
Plate XI. Fig. 1. 
This species is distinguished by the great distinctness and sharpness of its 
peripetalous fasciole, which is somewhat pentagonal in outline, and surrounds 
the few primary tubercles found near the apical extremity. The plates of both 
of the ambulacral and interambulacral areas of the abactinal part of the test are 
covered by small secondaries and miliaries; this tuberculation is closer than 
in any other species of the genus; the posterior extremity is more vertically 
truncated, and the anal groove not so pronounced as in H. fulva. The anal 
system is pyriform, its greatest diameter being transverse, as in H. fragilis. 
There are only two of the larger primary tubercles in the lateral interambu- 
lacra carrying long curved spines. 
Station No, 3363, northeast of Cocos Island, in 976 fathoms. 
3 “ 3365, northeast of Cocos Island, in 1010 fathoms. 
s “ 3376, South of Malpelo, in 1132 fathoms. 
BRISSINA Gray. 
Aérope fulva A. Ac. 
Plate VII. Figs. 5, 6. 
This species is readily distinguished from the other species of the genus by 
its proportionally greater length, the lateral flattening of the test, and the 
pointed anal rostrum. The tuberculation is also closer, and the primary spines 
are slender in comparison with the stouter spines of Aérope rostrata. The anal 
plastron is elongate, triangular, closely packed with primaries, the actinostome 
longitudinally elliptical. The anal system is somewhat pyriform, with the 
anal opening in the posterior part of the anal system. 
Station No. 3361, on way to Cocos Island from Mariato Pt., in 1471 fathoms. 
À “ 3362, on way to Cocos Island from Mariato Pt., in 1175 fathoms. 
i “ 3381, north of Malpelo Island, in 1772 fathoms. 
t “ 3398, off Galera Point, in 1573 fathoms, 
s “ 3399, off Galera Point, in 1740 fathoms. 
Schizaster latifrons A. Ao. 
Plate XI. Figs. 2, 3. 
At Station 3431, in 995 fathoms, were collected specimens of a species of 
Schizaster remarkable for the great development of the anterior extremity, the 
breadth of the anterior ambulacrum, and the short posterior pair of ambulacral 
petals, This species belongs to the Schizaster group, of which S. Philippii is a 
well known representative. 
