344 APPENDIX. 
now known is 77; about 40 peculiar. Three of the operculates 
are found also in Cuba. 
Jamaica, Stoastoma, has two extra-limited species, one in 
Hayti, and one in Porto Rico, 
Hayti. Gonave has 21 species, of which 8 are operculates. 
There are two peculiar species of Cylindrella, and curleue lye a 
form of Helix sagemon, of Cuba. 
The gradual diminution of genera easterly is curious: Mega- 
lomastoma disappears; there is a fossil impression of Strophia 
in Sombrero, and a fossil species in St. Croix. Strophia, Macro- 
ceramus, Megalomastoma, Tudora, Cistula, are absent in the 
Lesser Antilles; there is one Macroceramus on the Anguilla 
Bank. Cy clophorus is represented in the West Indies only in 
the Lesser Antilles. 
Table of Sedimentary Deposits [p. 224]. 
Strike out from Pliocene the Sumter Period, and insert in 
Miocene (Eastern U. S8.): 
Carolinian (Sumter), so as to stand opposite Sarmatian 
[p. 225 ]. 
[P. 225.] Instead of Yorktown Period, put 
Virginian, 
(Yorktown,) 
Marylandian, so as to stand opposite Mediterranean 
Stages, ete. 
[P. 226.] (R. h. column, at bottom), instead of “ Panfield,” 
read “ Punfield.” * 
[P. 227.] Jurassic (r. h. column’, after “Great Oolite ” insert 
“Dorrer,” 
[P. 229.] (R-h. column, at top), instead of ‘ Ludovian,” read 
‘“* Ludlovian.” 
Classification [p. 252]. 
Macdonald (Jour. Linn. Soc., xv, 161, 255) discusses the value 
of some of the characters employed in the classification of the 
Mollusca, pointing out the existence of several analogous genera, 
and analogous subdivisions of the Heteropoda and ‘Pulmonata. 
He proposes the following system for the gastropods :— 
Division I. Moneecia. 
Subdivision I. Lingual dentition typically pavimental. 
Order 1. Pneumonophora. 
Suborder 1. Pulmonata. 
A. Terrestrial; B. Aquatic; C. Estuary or Marine. 
Order 2. Apneumonophora. 
Suborder 1. Nudibranchiata. 
A. Cryptobranchiata (Phylliroé, Elysia, Limapontia, 
etc. ). 
B. PW ae (Eolis, Doris, Tritonia, Phyllidia, 
etc.). 
