334 MANUAL OF NATURAL HISTORY. 



2. Family. — Gorgon-Reads (Euryalidse). Body or- 

 bicular, depressed, covered with a leathery 

 skin, strengthened behind by five pairs of 

 radiating ribs ; arms compressed, rounded or 

 square, with a series of pores on each side, • 

 and usually repeatedly branching; mouth 

 inferior, centraL 



VI. OEDEE. — Pinnate-armed Starfishes 

 (Pinnigrada). 



Eays furnished with pinnae, having the skin deve- 

 loped on their sides, so as to be the principal organs 

 of progression through the water ; generative sys- 

 tem spread over tegumentary covering of body and 

 arms ; free, or attached to foreign bodies by a peduncle. 



I. SUB-ORDER. — Free-Crinoideans (Liberida). 



Either permanently unattached or become so in 

 their mature state ; some furnished with a tapering 

 column, enabling the animal to attach or detach 

 itself at will. 



1. Family. — Feather -Stars (Antedonidse). Eays 



five, subdivided and pinnate, resembling fea- 

 thers ; free when adult, young fixed and 

 stalked. (Comatula, Lam.) 



II. SUB-ORDER. — Fixed-Crinoideans (Cionacineta). 



Fixed to extraneous objects, usually by a jointed, 

 flexible column attached to the dorsal surface. 



2. Family. — Pedunculated Lily-stars (Pentacrini- 



tidse). Eays with numerous jointed lateral 

 appendages ; peduncle five-sided, jointed, with 



