ILLUSTRATIONS 



Page. 



Plate I. ITintacrinns socialis Grinuell 106 



II. Uiutacriuiis sociiilis Griiuiell 108 



III. l?ourgneticriuns alabamcnsis de Loriol; Pentacriuus asteriscus 



Meek & Hayden; Peutacriiins P.ryaui Gabb; Pentacriuus 



AVhitei Clark HO 



IV. Opliioglypha bridgerensis (Meek) ; Ophioglypha texana Clark. 112 

 V. Goniaster mamuiillata Gabi) ; Asterias diibiuin Whitfield 114 



VI. Cidaris tayloreusis Clark; Cidaris caliroruii'u.s Clark; Cidaris 



spleudens Morton ; Cidaris Walcotti Clark 116 



VII. Cidaris texanus Clark; Leiocidaris hemigrauosus (Shumard).. 118 



VIII. Leiocidaris liemigraiiosiis (Shuuiard) 120 



IX. Leiocidaris beniigranosiis (Shumard) 122 



X. Saleuia texana Credner 124 



XI. Salenia tumidula Clark; Saleuia bellula Clark 12fi 



XII. Hemicidaris intuniescens Clark; Pseudodiadema Eniersoui 



Clark 128 



XIII. Pseudodiadema diatretum (Morton) ; Pseudodiadema texanum 



(Roemer) - 13^' 



XIV. Pseudodiadema texanum (Roemer) 132 



XV. Diplopodia texanum (Roemer) 13* 



XVI. Diplopodia texanum (Roemer); Diplopodia Hilli Clark 136 



XVII. CoptoscmiarMortoni (de Loriol) 138 



XVIII. Coptosoma si)eciosum Clark; Gonioi)ygus Zitteli Clark 140 



XIX. Goniopygus Zitteli Clark 1'12 



XX. Psammcchinus cingulatus Clark 144 



XXI. Pediuopsis Pondi Clark I'l^ 



XXII. Pediuopsis Pondi Clark 148 



XXIII. Stomechiuns Ilyatti Clark; Holectypus planatus Roemer 150 



XXIV. Pyrina Parryi Hall 152 



XXV. Botriopygiis alabameusis Clark 154 



XXVI. Echinobrissus expansus Clark ; Echiuobrissus texanus Clark.. 156 

 XXVII. Trematopygus crucifer (Morton) ; Catopygus o\ iformis Conrad ; 



Catopygus pusillus Clark , ■. 158 



XXVIII. Cassidulus florealis (Morton) 160 



XXIX . Cassidulus ajquoreus Morton 162 



XXX. Cassidulus micrococcus (iabb 164 



XXXI. Cassidulus subciuadratus Conrad 166 



XXXII. Cassidulus subconicus Clark 168 



XXXIII. Cassidulus porrectus Clark 170 



XXXIV. Cassidulus porrectus Clark 1'2 



XXXV. Cassidulus porrectus Clark; Cassidulus Stantoni Clark 174 



XXXVI. Auaucbytes ovalis Clark 176 



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