Order I.— ACEPHALA TESTACEA—( conliiived). 



Cyitodaria, 106 ' 



Paiiopca, 107 



Pandora. IO7 

 Byssomia, 107 I 



Hiatella, 107 

 Solon, 108 



Solen proper, 108 ; 



Sanguinolaria, 108 



Psammobia, 108 



Psammotliea, 108 

 Pholas, 108 



Teredo, 109 I 



Fistulana, 109 

 Gastrochaena, 1 10 

 Teredina, 110 

 Clavagclla, 110 

 Aspergillum, 110 



Order II.— ACEPHALA NUDA, 111 . 



Fam. 1. — Segregat.4, 111 I 



Salpa, 111 i 



Thaliae, 112 ; 



Salpa proper, 113 1 



Ascidia, 113 j 



Tlieyton of Aristotle, 1 13 



Fam. 2. — Aggregata, 114 ; 



Botryllus, 114 J 



Pyrosoma, 115 'l 



Polyclinum, 115 1 



Escharw, 116 i 



CLASS v.— BRANCHIOPODA. ^ 



Ligula, 116 

 Terebratula, 117 



Spirifer, 117 



Thecidea, 117 ' 



Orbicula, 118 ' < 



Discina?, 118 



Crania, 118 



CLASS VI.— CIRRHOPODA, 



Lepas, 119 



Anatifa, 119 I 



PoUicipes, 120 1 



Cineras, 120 I 



Otion, 120 



Tetralasmis, 120 

 Balanus, 120 



