TABLE SHOWING THE CLASSIFICATION OF THE ECHINOIDEA 
DESCRIBED IN THIS CHAPTER 
Class 
ECHINOIDEA 
Order DESMOSTICHA or REGULARIA 
Shell usually globular ; mouth and anus polar ; lantern of Aristotle present) 
Families Genera Species 
Cidaris C. tribuloides 
: F D. papillota 
OIDARIDE Dorocidaris - 
D. Blaket 
Porocidaris P. sharreri 
ARBACIADE { Arbacia A. punctulata 
Coelopleurus C. floridanus 
DIADEMATIDE Diadema D. setosum 
Echinometra E. subangularis 
S. drobachiensis 
ECHINOMETRIDE Strongylocentrotus S. purpuratus 
S. franciscanus 
; Echinus E. gracilis 
Es Toxopneustes T. variegatus 
* Order CLYPEASTROIDEA 
(Corona or shell a more or less flattened disk; anus excentric; lantern of Aristotle present) 
SCHINAN TR ; Clypeaster C. ravenellii 
Echinanthus E. rosaceus 
Echinarachnius ; - P see - 
SCUTELLIDE § CL COHCUS 
Mellita M. testudinata 
Encope E. michelini 
Order SPATANGOIDEA or PETALOSTICHA 
(Heart-shaped ; mouth and exeretory opening excentric; no lantern of Aristotle) 
Moira M. atropos 
Lovenia L. cordiformis 
SPATANGOIDE Schizaster S. fragilis 
Metalia M. pectoralis 
Brissopsis B. lyrifera 
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