REPORT ON THE ECHINOIDEA. 



231 



Or thirty-two genera of Desmosticha, representing one hundred and seven species. 



FiBULAEiNA (4 species). Scutellid/E (21 species). 



Echinocyamus, 1. Echinarachnius, 3. 



Fibularia, 3. 



EcHiNANTHiD^ (6 species). 

 CJypcaster, 4. 

 Echinanthus, 2. 



Laganid^ (7 species). 

 Lagatvum, 3. 

 Peronella, 4. 



Or thirteen genera of Cl}T)eastrid8e, represented by thirty-eight species. 



Arachnoides, 1. 

 Echinodiscus, 3. 

 Mellita, 6 

 Astriclypeus, I. 

 Rotula, 2. 

 Encope, 5 



EcHlNONElD.^ (2 species). 

 Echinoneus, 2. 



NucLEOLiD^ (9 species). 



Echinolampas, 4. 

 Rhy)}chopygus, 2. 

 Echinohrissus, 1. 

 Nucleolites, 1. 

 Anochanus, 1. 



Anajstchytid.^ (2 species). 

 Paleopncustes, 1. 

 Platyhrissus, 1. 



Spatangina (14 species). 



Spatangus, 2. 

 Maretia, 3. 

 Eupatagus, 1. 

 Lovenia, 3. 



Breynia, 1. 

 Echinocardhim, 4. 



Leskiad/E (1 species). 

 Paleostoma, 1. 



Brissina (28 species). 



Hemiaster, 1. 

 Trvpyliis, 1. 

 Rhinobrissua, 2, 

 Brissopsis, 2. 

 Agassizia, 1. 

 Byissiis, 3. 

 Metalia, 5. 

 Meoma, 2. 

 Linthia, 2. 

 Faorina, 1. 

 Schizaster, 5. 

 Moira, 3. 



Or twenty-seven genera of the Petalosticha represented by fifty-six species. 



These two hundred and one species give us from their geographical distribution 

 the characteristic littoral faunse, and from the comparison of which I had been led, in the 

 Revision of the Echini (p. 212), to subdivide the recent Echinid faunae into the following 

 great realms: — Atlantic, Circumpolar, AustraUan, Antarctic, Pacific, and American. These 

 subdivisions, of course, have partially lost their significance as will be seen in the 

 discussion of the geographical lists which follow. 



