192 Miscellanea. 
Kiemia. Shell ovate, elongate, ventricose, subcordate, vertex 
subcentral ; centre of back with rather larger perforated tubercles ; 
lateral ambulacra sunken, ovate, linear, confluent near the vertex, 
where the inner series of twin pores are nearly obliterated, the 
anterior pair diverging, the hinder pair nearly parallel, diverging 
at the end, the anterior odd one in a rather deep groove with only 
rudimentary pores; all surrounded by a broad, rather sinuous peri- 
petalous fasciole; subanal fasciole surrounding the oblong subanal 
plate, which is covered with radiating series of tubercles, and trans-_ 
versely divided in half by a subcentral fasciole ; ovarial pores four, 
hinder largest ; mouth anterior, vent in the upper part of the high 
hinder extremity covered with small irregular plates; spines of the 
crown elongate subulate, of the plastron and subanal plate longer, 
stronger, rather dilated at the end. 
This genus differs from Brissus in the peculiar form of the ambu- 
lacra, and in the larger size of the dorsal spines and tubercles, and 
from Plagionotus in the form of the subanal plate and ambulacra. 
Kleinia Luzonica. Shell ovate, ventricose; ambulacra confluent 
near the vertex, inner series of pores nearly obliterated; lateral 
ambulacra ovate, petaloid, the hinder pair shorter, nearly parallel, 
anterior pair divergent; vent in the upper part of the high hinder 
extremity. 
Hab. Philippines, Isle of Luzon. 
Agassizia subrotunda. Ovate, subglobose, regular, even, without 
any tubercles on the side or round the vent, the odd anterior groove 
with two lines of minute tubercles. 
Hab. Australia, Capt. Sir Edward Belcher. 
Lesxia. Shell ovate, subglobose, thin, vertex central; lateral 
ambulacra broad, petaloid, rather sunken and separate from each 
other, the hinder lateral pair rather the shortest, the odd anterior 
ambulacra in a rather broad sunken groove, rudimentary, with only 
a single series of pores on each side; all surrounded by a broad 
rather sinuows peripetalous fasciole; lateral and subanal fasciole 
none; mouth anterior, round, on a level with the rounded under 
surface, and covered with five triangular converging valves; plastron 
and subanal plate not distinctly defined; anus round, in the upper 
part of the rounded posterior end, and covered with five triangular 
converging valves forming a cone, with some small spicula in the 
centre; ovarian pores two, very large; spines and tubercles sub- 
equal, subulate, those of the back being rather the largest. 
This genus agrees with Brissus in the form of the peripetalous 
fasciole, but differs from it and all the other Spatangide in the form 
of the mouth and vent. 
1. Leskia mirabilis. Shell ovate, subglobose. 
Hab, Isle of Luzon. 
