2>1 



INDEX TO GENERA. 



The page referred to is that on which the genus is diagnosed or otherwise defined. 



The trivial names foUowing each generic iiame are ail those found associated with it in the 

 Synopsis, whether as valiil spécifie names or as synonyms. 



Varietal names are included among the trivial names in alphabetic order, and each 

 is followed by the spécifie name to which it belongs. 



Acrocidaris, 83 : censoriensis, depressa, formosa, minor, nobilis, striata, 

 tuberosa. 



Acrocladia, 137. 



Acropeltis, 85 : aequituberculata, concinna. 



Acrosalenia, 139 : ang^ularis, aspera, boloniensis, bouchardi, complanata, conformis, 

 crinifera, decorata, depressa, elegans, exile, granulata, gratiosa, hemi- 

 cidaroides, interpunctata, koenigii, laevis, laaiarckii, lens, lovveana, lycetti, 

 meriani, minuta, patella, pisum, pustulata, radians, radiata, rarispina, 

 spinosa, tenera, tuberculosa, virgulina, wiltoni. 



Agarites, 1 13. 



Agassizia, 394 : scrobiculata. 



Amblypneustes, Iio. 



Amblypygus, 255 ; americanus, apheles, arnoldi, dilatatus, michelini. 



Amphidetus, 406 : cordatus, depressus, sartorii, subcentralis, virginianus. 



Amphiope, 235 : bioculata, bisperforata, elliptica, perspicillata. 



Ananchytes, 329 : analis, bicordatus, carinata, cinctus, conica, conoidea, cor-avium, 

 corculum, ci rdata, crassissima, criiciferus, elato-depressa, ellipticus, etidesii, 

 fimbriata, gibba, gravesii, hemisphaerica, latissima, minor, monardii, 

 ovata, pilula, pyramidata, rustica, scutatus, semi-globus, spatangiformis, 

 striata, subglobosus, sulcatus, tuberculata. 



Anaster, 217 : studeri. 



Anorthopygus, i88a (1858) : costellatiis. 



Arachnoides, 230 : placenta. 



Arbacia, 113: conica, conjuncta, depressa, forbesi, globosa, globulus, granulosa, 

 hieroglyphica, jurassica, minima, monilis, nodulosa, pilos, pulchella, 

 richeriana, spadae. 



Archaeocidaris, 153: kaiserlingii, koninckii, nerei, prisca, triserialis, urii, ver- 

 neuillana. 



Archiacia, 324 : cornuta, gigantea, sandalina, santonensis. 



Asteropyga, 83 : radiata. 



Asterostoma, 196 : excentricum. 



Boletia, 133. 



Botriopygus, 278 : campicheanus, coarctatus, cotteauanus, cylindricus, elegans, 



meyeri, minor, nucula, obovatus, ovatus, sueurii, testudo, toucasanus. 

 Breynia, 408 : carinata, crux-andrae, magna, sulcata. 

 Brissopsis, 378 : alarici, angusta, borsoni, branderiana, contracta, crescenticus, 



decliva, duciei, elegans, genei, intermedia, latior, lyrifer, nicoleti, obliquata, 



oblonga, ovata, romuli, scutiformis, sismondae, sowerbyi. 

 Brissus, 403 : antiquus, carinatus, columbaris, cordieri, cruciatus, cylindriciis, 



declivis, dilatatus, expansus, fragilus, helveticus, imbricatus, inaequalis, 



jutieri, latus, oblongus, placenta, rana, scillae, subacutus. 

 Brontia, 182 : lachmundi, prima. 



Caratomus, 249 : avellana, faba, gehrdcnsis, hemisphaericus, latirostris, orbi- 



cularis, peltiformis, rostratus, sulcato-radiatus, nigonopygus, truncatus. 

 Cardiaster, 344 : ananchytis, benstedis \_sic\, bicarinafus, bourgeoisanus, cinctus, 



