ECHINODERMATA. 



33 



The Orinoidea are sometimes included with the Blastoidea and Cystoidea 

 to form a special section of Echinodermata, to which the name of Pelma- 

 tozoa is applied. If this course be followed, the Echinoidea, Asteroidea, 

 Ophiuroidea, and Holothuroidea will constitute a second great primary 

 division or class of Echinoderms, to which the name of Echinozoa may be 

 given. 



(W. B. Carpenter, On the Structure, Physiology, and Development of Ante- 

 don rosaceus, Phil. Trans., vol. clvi., 1876 ; M. Sars, Memoires pour servir 

 a la connaissance des Orinoides vivants, Christiania, 1868 ; Wyville Thom- 

 son, Notice of New Living Grinoids belonging to tlie Apiocrinidce, Journ. 

 Linn. Soc., 1876 ; P. H. Carpenter, On the Oral and Apical Systems of 

 Echinoderms, Quart. Journ. Micros. Sci., vol. xviii. ; Gotte, Vergleichende 

 Entwickelungsyeschichte der Comatula Mediterranea, Archiv fiir Mikros. 

 Anat., 1876 ; Schultze, Monographie der Echinodermen der Eifler Kallc, 

 Denkschr. der K. Akad. der Wiss., 1876.) 



28. Crinoidea. Comatula rosacea, a free Crinoid, viewed from its 

 dorsal or aboral aspect. 



C 



