Contents. xi 



CHAFTER XV. 



Page. 

 Sub-class 2, Siphonophora ; Order i, Calycophorid^ ; Order 2, 

 Physophoridse. Sub-class 3, Calycozoa; Order i, Lucer- 

 naridae, 96 



CHAPTER XVI. 



Sub-class 4, Discophora; Order i, Rhizostomida ; Order 2, 



Pelagiada, .......... 102 



CHAPTER XVH. 



Sub-class 5, Ctenophora; Order i, Eurj'stomata ; Order 2, 



Saccatae; Order 3, Taeniatae ; Order 4, Lobatae, . . .106 



CHAPTER XVHI. 



Class 2, Actinozoa; Sub-class i, Zoantharia; Order i, Malaco- 

 dermata; Order 2, Sclerodermata ; Order 3, Aiitipatharia, 

 Coral reefs, .......... 



109 



CHAPTER XIX. 



tSub-class 2, Alcyonaria;' Order i. Alcyonacese ; Order 2, Tubipo- 

 racese ; Order 3, Pennatulace« ; Order 4, Gorgonaceae ; 

 Order 5, Isidacese ; Order 6, Briareacese ; Order 7,^Coral- 

 liacese, . . . . . . . - . . .118 



CHAPTER XX. 



-Sub-kingdom IV.— Echinodermata. Class i, Stellerida ; Order i, 

 Blastoidea; Order 2, Cystoidea; Order 3, Crinoidea; Order 4, 

 Ophiuroidea ; Order 5, Brisingoidea ; Order 6, Asteroidea, . 123 



CHAPTER XXI. 



Class 2, Echinoidea ; Order i, Tessellata ; Order 2, Euechinoidea, . 137 



