OF POLYPS. 149 



SUBORDER III. PEXXATUALACEA. 



Polyps forming free, moving colonies, the composite 

 basal portion with locomotive functions and special 

 cavities, with or without a solid free axis. 



Families, Pennatulidce, Pavon&ridce, Veretillidce. Eenil- 

 lidce. 



Among the most interesting species in this collection 

 the following may be mentioned : 



STEPHANOSERIS LAMELLOSA Yen-ill. 



Coral low, subcylindrical, with a broad base, which 

 completely covers small univalve shells with the exception 

 of the opening; wall rudimentary; septa in four cycles, 

 the primaries much the largest with subentire rounded 

 tops ; columella well developed, papillose, costas prom- 

 inent, unequal. 



Loo Choo Islands. Dr. Wm. Stimpson. 



HETEROCYATHUS ALTERXATA Yerrill. 



A low species with very unequal septa and costse, the 

 primary septa very prominent. Encrusts and covers small 

 univalve shells. 



Gaspar straits. Capt. John Rodgers. 



BALANOPHYLLIA CAPEXSIS Yerrill. 



A species about half an inch high, broadly attached, 

 slightly turbinated, with an epitheca rising within a line of 

 the margin. Calicle deep, .broadly oval. Septa in four 

 cycles, the principal ones much exsert, vertical, narrowed 

 at top, those of the fourth. cycle joining the columella 

 in pairs. Color of the living polyp bright orange. 



Cape of Good Hope. Dr. Wm. Stimpson. 



