SYNOPSIS 
OF THE 
MODIFIED LAMARCKIAN ARRANGEMENT.* 

The genera in Italics, are not to be found in Lamarch’s classification. Those 
attached by brackets to one of his genera, may be held by purists as included in is 
The numerals mentioned are inclusive. 
Siliquaria. Ser. 25, 26, 27: Hel. 85? 
Dentalium. Den. | to 10. 
Caecum. Den. 12, 13, 14, 152: Ser. 3. 
\Ditrupa. Den. 11. 
Spirorbis. Ser. 5 to 8, 10 to 16. 
Serpula. Ser. 17, 182, 19 ?, 31, 32, 36, 38: Ser. Sup. 1. 
Vermilia. Ser. 9, 332: Ser. Sup. 4?. 
Tubicinella. Lep. 1. 
Coronula. Lep. 2, 3, 4: Lep. Sup. 2. 
Balanus. Lep. 5 to 15, 17 to 29, 32: Lep. Sup. 5, 7. 
Acasta. Lep. 16. 
Pyrgoma. Lep. Sup. 4. 
Creusia. Lep. 30, 31. 
Anatifa. Lep.36 to 41: Lep. Sup. 1. 
Pollicipes. Lep. 33, 34, 35, 42: Lep. Sup. 3, 6. 
Cineras. Lep. 43, 44. 
Otion. Lep. 45. 
Aspergillum. Ser. 34.—APx. ix. 23, 545 x. 19. 
Clavagella.—Apx. ix. 21, 22; x. 21; i. | to'4. 
Fistulana.—APx. xi. 5 5 xiii. 59. 
Septaria. Ter. 1. 
* The editor disclaims all idea of system-making. The arrangement (one of mere 
expediency,) is that of Lamarck, with the addition of some of the more absolutely 
indispensable modern genera. These are not inserted according to their natural 
affinities, but in proximity to that Lamarckian genus, which either once included 
them, or to whose definition their characters are least opposed. 
