INDEX. 
Oeder I. — ACEPHALA TESTACEA — (contimi^d^, 
Cyrtodaria, ]06 
Panopca, 107 
Pandora, 107 
Byssomia, 107 
Hiatclla, 107 
Solen, 108 
Solen proper, 108 
Sanguinolaria, 108 
Psammobia, 108 
Psammotliea, 108 
Pholas, 108 
Teredo, 109 
Fistulana, 109 
Castrochaena, 110 
Teredina, 110 
Clavagella, 110 
Aspergillum, 110 
Order II.— ACEPHALA NUDA, 111 
Fani. 1. — Segregat.a, 111 
Salpa, 1 1 1 
Thaliae, 112 
Salpa proper, 113 
Ascidia, 113 
They ton of Aristotle, 113 
Fam. 2. — Aggregata, 114 
Botryllus, 114 
Pyrosoma, 115 
Polyclinum, 115 
Eschara?, 110 
CLASS V.— BRANCHIOPODA. 
Ligula, 1 16 
Terebratula, 117 
Spirifer, 117 
Thecidea, 1 1 7 
Orbicula, 118 
Discinae, 1 18 
Crania, 118 
CLASS VI.— CIRRHOPODA. 
Lepas, 1 19 
Anatifa, 119 
Pollicipes, 120 
Cineras, 120 
Otion, 120 
Tetralasmis, 120 
Balanus, 120 
xvii 
V ’ Ol . id. 
