^O. riisei^, ^O. æthiops^, ^O. Alexandri^. These animals have long spines on the sides of the arms, which give them a bushy appearance. The surface of the body is granulated, but the arms are covered with wide plates. Their color is brown above and light beneath. /O. riisei/ is found at Key West, the other two species on the coast of Lower California. (Plate LV.) GENUS ^Ophiothrix^ ^O. angulata.^ Body covered with short, rough spines; egg-sacs conspicuous and extend like lobes between the arms; rays narrow and thickly beset with long spines, which are serrated on the edges and ends. Found on the Florida coast. (Plate LV.) [Illustration: PLATE LV. Astrophyton. Ophiocoma æthiops Ophiothrix angulata. Ophiopholis aculeata. Ophiocoma Alexandri. Amphiura squamata.] [pg217] 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 ~CIDARIDÆ~ ^Cidaris^ ^C. tribuloides^ ^Dorocidaris^ ^D. papillota^ ^D. Blakei^ ^Porocidaris^ ^P. sharreri^ ~ARBACIADÆ~ ^Arbacia^ ^A. punctulata^ ^Cœlopleurus^ ^C. floridanus^ ~DIADEMATIDÆ~ ^Diadema^ ^D. setosum^ ~ECHINOMETRIDÆ~ ^Echinometra^ ^E. subangularis^ ^Strongylocentrotus^ ^S. drobachiensis^ ^S. purpuratus^ ^S. franciscanus^ ~ECHINIDÆ~ ^Echinus^ ^E. gracilis^ ^Toxopneustes^ ^T. variegatus^ Order =CLYPEASTROIDEA= (/Corona or shell a more or less flattened disk; anus excentric; lantern of Aristotle present/) ~ECHINANTHIDÆ~ ^Clypeaster^ ^C. ravenellii^ ^Echinanthus^ ^E. rosaceus^ ~SCUTELLIDÆ~ ^Echinarachnius^ ^E. parma^ ^E. excentricus^ ^Mellita^ ^M. testudinata^ ^Encope^ ^E. michelini^ Order =SPATANGOIDEA= or =PETALOSTICHA= (/Heart-shaped; mouth and excretory opening excentric; no lantern of Aristotle/) ~SPATANGOIDÆ~ ^Moira^ ^M. atropos^ ^Lovenia^ ^L. cordiformis^ ^Schizaster^ ^S. fragilis^ ^Metalia^ ^M. pectoralis^ ^Brissopsis^ ^B. lyrifera^ [pg218] CLASS =ECHINOIDEA=