56 



Farn. 1. Aspidodiadematidæ. 



— 2. Diadematidæ. 



— 3. C?) Pseudodiadematidæ. 

 4. Micropygidæ. 



— 5. Pedinidæ. 



— 6. Hemicidaridæ. 



Tribus 2. Salenina. Ambulacra simple; tubercles imperforate ; teeth keeled. 



Fam. 1. Saleniidæ. 

 Tribus 3. Phymosomina. Ambulacra diadematoid; tubercles imperforate; 



teeth keeled. 



Fani. 1. Arbaciidæ. 



— 2. Phymosomatidæ. 



— 3. (?) Stomechinidæ. 



Tribus 4. Echinina. Ambulacra echinoid ; tubercles imperforate ; teeth 



keeled. 

 Fam. 1. Stomopneustidæ. 



— 2. Temnopleuridæ. 

 Subfam. Temnechininæ. 



— Temnopleurinæ. 

 Fam. 3. Echinidæ. 



Subfam. Parechininæ. 



— Echininæ. 

 Fam. 4. Toxopneustidæ. 



Subfam. Schizechininæ. 



— Strongylocentrotinæ. 



— Parasaleninæ. 

 Fam. 5. Echinometridæ. 



Fam. Temnopleuridæ. 



It is a very surprising fact that the pedicellariæ of the Temnopleurids prove 

 to be only of subordinate value for classification. In the allied families Echinidæ, 

 Toxopneustidæ and Echinometridæ they aiford excellent characters for both species, 

 genera and families, and also in the Cidaridœ, Ecliinothuridæ and Diadematidæ they 

 atTord very important systematic characters. In the Temnopleurids they mostly 

 give only specific characters. In the larger genera, e. g. Salmacis, Temnoplearns, the 

 globiferous pedicellariæ assume the forms occurring both in the Ecliinidæ, Toxo- 

 pneustidæ and Echinometridæ; in some species, e.g. Salmacis bicolor, they even 

 occur in the same specimen in both the two fo r m s which distinguish 

 the families Toxopneustidæ and Eclxinomelridti'. This very curious fact, of 



