436 
APPENDIX. 
distant inferior notch ; internally pearly, with a broad brown 
margin on the lower edge. 
Inhab. North and West coasts of Australia. 
2. Spatangus elongatus, pL 6. f. 2. 
Body elongate, cordate, with a deep anterior grove and 
notch ; covered above with minute hair-like spines, with 
scattered very elongated tubular minutely striated spines 
on the sides ; the anterior groves and circumference of 
the vent with larger equal hair-like spines on each side ; 
the under surface with a triangular disk of similar spines 
beneath the vent, and with elongated larger tubular spines. 
Inhab. Western Australia. 
Having only a single specimen completely covered with 
spines, it is impossible to describe the form of the ambu- 
lacra or the disposition of the tubercles. The lower 
figures represent the mouth and vent of the animal in 
detail. 
