CATALOGUE OF ECHINIDA. 
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2. Agassizia subrotunda, t. 3, f. 2. 
Ovate, subglobose, regular, even, without any tubercles on 
the side or round the vent ; the odd anterior groove with two 
lines of minute tubercles. 
Agassizia subrotunda, Gray , Ann. 8$ Mag. N. H. 1851, Feb. 
Hab. Australia. Captain Sir Edward Belcher. 
a . Broken. Australia X Presented by Captain Sir Edward 
Belcher. 
by Cy dy e. Two with spines. Australia ? 
Fam. 7. LESKIADJE. 
Shell ovate, subglobose, thin ; vertex central ; lateral ambu- 
lacra 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 ; rudi- 
mentary, with only a single series of pores on each side, all 
surrounded by a broad, rather sinuous, 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 con- 
verging valves, forming a cone, with some small specula in the 
centre ; ovarial pores two, very large ; spines and tubercles sub- 
equal, subulate, those of the back being rather the largest. 
1. Leskia. 
Character of family. 
Leskia, Gray, Ann. § Mag. N. H. 1851. 
This genus agrees with Brissus in form of the peripetalous 
fasciole, but differs from it and all the other Spatangidse in the 
form of the mouth and vent. In this respect it has con- 
siderable affinity with the fossil Cystidea of Yon Buch, as 
especially the genera Echinosphoerites. 
1. Leskia mirabilis. t. 4, f. 4. 
Shell ovate, subglobose. 
Leskia mirabilis, Gray, Ann. & Mag. J5T. H. 1851. 
Hab. Isle of Lucon. 
a, by c, d. Isle Lucon. Mr. Cuming’s Collection. 
