xlii CONTENTS OF VOL. II. 



Page. 



b Branchial orifice only furnished with six rays, Sy- 

 noicum, Sydneum. Polyclinum. Alpidium. Di- 

 demnum. . . . 513 



II. Branchial orifice simple. 



Botryllus. Euclaeium. . . 515 



Tribe II. 



Body free and moving about in the water. 



Pyrosoma. . 516 



Subdivision II. Interior tunic adhering throughout to 



the external one Salpa. . . .517 



Preparation of Molluscous Animals. . jb. 



n. 



ANNULOSA. 



General characters, 518 



Subdivision I. ANNULOSE ANIMALS WITH AR- 

 TICULATED LIMBS 10R LOCOMOTION. 



General characters. Skin. Muscles. Head. Trunk. 

 Thorax, thoracic sternum. Breast, scutellum, pec- 

 toral sternum. Abdomen. Members, wings, elytra 

 poizers, legs. Nervous system. Eyes. Antennae. 

 Masticating organs. Gullet. Dorsal vessel. Stig- 

 mata, Trachea. Ovipositor, larva, pupa, imago. . 519 



Order I. With Branchial Aerating Organs. 



Section I. MALACOSTRACA. 



Tribe I. Podophthalma. 



A. Brachyura. Lambrus. Corystes. Portumnus. 

 Mantua. Cancer. Pilumnus. Pinnoteres. Ocy- 

 pode. Graspus. Homola. Dorippe. Eurynome. 



